| Diagnosis and Testing Refer to Wiring Diagrams Section 501-16, for schematic and connector information. Special Tool(s) | | Terminal probe kit 29-011A | Inspection and Verification - Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart | Mechanical | Electrical | - Wiper blade(s)
- Wiper arm pivot shaft
- Washer reservoir
- Hose(s)
- Washer nozzles
| - Fuse(s)
- Electrical connector(s)
- Washer pump
- Wiper motor
- Wiring harness
| - If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.
Symptom Chart Symptom Chart | Symptom | Possible Sources | Action | | The wipers are inoperative | * Fuse(s) * Circuit(s) * Rear wiper relay * Multifunction switch * Windshield wiper motor * Rear wiper motor (with tailgate) * Rear wiper motor, left/right-hand side (with rear doors) | * | | The wipers stay on continuously | * Circuit(s) * Multifunction switch * Windshield wiper relay * Rear wiper relay * Windshield wiper motor * Rear wiper motor (with tailgate) * Rear wiper motor, left/right-hand side (with rear doors) | * | | The high wiper speed does not operate correctly (intermittent wiper mode OK) | * Circuit(s) * Multifunction switch * Windshield wiper motor | * | | The low wiper speed does not operate correctly | * Circuit(s) * Multifunction switch * Windshield wiper motor | * | | Intermittent wiper is inoperative (other functions OK) | * Circuit(s) * Windshield wiper relay * Multifunction switch | * | | The wipers will not park at the correct position | * Circuit(s) * Windshield wiper relay * Multifunction switch * Windshield wiper motor * Rear wiper motor (with tailgate) * Rear wiper motor, left/right-hand side (with rear doors) | * | | The rear wiper(s) do not operate correctly with the washer function | * Circuit(s) * Rear wiper relay * Multifunction switch | * | | The washer pump is inoperative | * Fuse(s) * Circuit(s) * Multifunction switch * Washer pump motor | * | Pinpoint Tests | PINPOINT TEST A : THE WIPERS ARE INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: CHECK THE FUSE F1.13 (BJB) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Fuse F1.13 (BJB). | | | 3 CHECK Fuse F1.13 (30 A) (BJB). | | | Is the fuse OK? Yes - The front and the rear wipers are inoperative: GO to A2. - The front wipers are inoperative: GO to A4. - The rear wiper (with tailgate) or both rear wipers (with rear doors) are inoperative: GO to A5. - One rear wiper is inoperative (with rear doors): GO to A14. No INSTALL a new fuse F1.13 (30 A) and TEST the system for normal operation. If the fuse blows again, LOCATE and REPAIR the short circuit by using the wiring diagrams. TEST the system for normal operation. | | A2: CHECK THE VOLTAGE AT FUSE F1.13 (BJB) | | | 1 Connect Fuse F1.13 (BJB). | | | 2 Ignition switch in position II. | | | 3 Measure the voltage between fuse F1.13 (BJB) and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 15-DD3 (GN/BK) or 15-DD3 (GN/RD) (Petrol engines), between ignition relay and fuse F1.13 (BJB) by using the wiring diagrams. TEST the system for normal operation. | | A3: CHECK THE VOLTAGE AT THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between multifunction switch, connector C202b, pin 6, circuit 15-KA1B (GN/YE), harness side and ground. | | | Is battery voltage indicated? Yes Check the multifunction switch according to Component Testing attached to the wiring diagrams. If necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 15-KA1B (GN/YE) or 15-KA1 (GN/YE), between fuse F1.13 (BJB) and multifunction switch by using the wiring diagrams. TEST the system for normal operation. | | A4: CHECK THE GROUND CONNECTION OF THE WINDSHIELD WIPER MOTOR | | | 1 Disconnect Windshield wiper motor from connector C125. | | | 2 Measure the resistance between windshield wiper motor, connector C125, pin 3, circuit 31-KA8 (BK), harness side and ground. | | | Is the resistance less than 2 ohms? Yes CHECK the wiper motor according to the Component Test attached to this section, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 31-KA8 (BK), between windshield wiper motor and ground G104 by using the wiring diagrams. TEST the system for normal operation. | | A5: CHECK THE FUSE F2.1 (BJB) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Fuse F2.1 (BJB). | | | 3 CHECK Fuse F2.1 (15 A) (BJB). | | | Is the fuse OK? Yes No INSTALL a new fuse F2.1 (15 A) and TEST the system for normal operation. If the fuse blows again, LOCATE and REPAIR the short circuit by using the wiring diagrams. TEST the system for normal operation. | | A6: CHECK THE VOLTAGE AT FUSE F2.1 (BJB) | | | 1 Connect Fuse F2.1 (BJB). | | | 2 Ignition switch in position II. | | | 3 Measure the voltage between fuse F2.1 (BJB) and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 15-DD4B (GN/BK), between ignition relay and fuse F2.1 (BJB) by using the wiring diagrams. TEST the system for normal operation. | | A7: CHECK THE VOLTAGE AT THE REAR WIPER RELAY (POWER CIRCUIT) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Rear wiper relay from connector C2020. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between rear wiper relay, socket C2020, pin 1, circuit 15-KA32 (GN/BU), relay box-side and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 15-GG1 (GN/YE) or 15-KA32 (GN/BU), between fuse F2.1 (BJB) and rear wiper relay by using the wiring diagrams. TEST the system for normal operation. | | A8: CHECK THE VOLTAGE AT THE REAR WIPER RELAY | | | 1 Measure the voltage between rear wiper relay, socket C2020, pin 4, circuit 15S-KA37 (GN/WH) or 8S-KA37 (WH/VT) (as of 08/2000 some models), relay box-side and ground. | | | 2 Turn on the REAR WINDOW WIPER. | | | 3 Measure the voltage between rear wiper relay, socket C2020, pin 5, circuit 15S-KA31(A) (GN/YE), harness side and ground. | | | Is in both measurements battery voltage indicated? Yes No | | A9: CHECK THE GROUND CONNECTION OF THE REAR WIPER RELAY | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between rear wiper relay: - LHD vehicle: socket C2020, pin 2, circuits 31-KA31 (BK) or 31-KA31 (BK/YE) (as of 08/2000 lower option content) or 31-HB10 (BK) or 31-HB10 (BK/GN) (as of 08/2000 Chassis cab), relay box-side and ground.
- RHD vehicle: socket C2020, pin 2, circuits 31-KA31 (BK) or 31-KA31 (BK/YE) (as of 08/2000 without parking aid) or 31-HB10 (BK) or 31-HB10 (BK/GN) (as of 08/2000 without parking aid), relay box-side and ground.
| | | Is the resistance less than 2 ohms? Yes No REPAIR the ground connection of the rear wiper relay by using the wiring diagrams. TEST the system for normal operation. | | A10: CHECK THE REAR WIPER RELAY | | | 1 Check the rear wiper relay according to Component Testing attached to the wiring diagrams. | | | Is the relay OK? Yes - Vehicles with rear doors: REPAIR the open circuit 32-KA32 (WH/RD), between rear wiper relay and splice S234 by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new rear wiper relay. TEST the system for normal operation. | | A11: CHECK THE VOLTAGE AT THE REAR WIPER MOTOR | | | 1 Connect Rear wiper relay with connector C2020. | | | 2 Disconnect Rear wiper motor from connector C4072. | | | 3 Ignition switch in position II. | | | 4 Turn on the REAR WINDOW WIPER. | | | 5 Measure the voltage between rear wiper motor, connector C4072, pin 3, circuit 32-KA32 (WH/RD), harness side and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 32-KA32(B) (WH/RD), between rear wiper relay and rear wiper motor by using the wiring diagrams. TEST the system for normal operation. | | A12: CHECK THE GROUND CONNECTION OF THE REAR WIPER MOTOR | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between rear wiper motor, connector C4072, pin 2, circuit 31-KA28B (BK), harness side and ground. | | | Is the resistance less than 2 ohms? Yes CHECK the rear wiper motor, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 31-KA28B (BK), between rear wiper motor and ground G401 by using the wiring diagrams. TEST the system for normal operation. | | A13: CHECK THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Check the multifunction switch according to Component Testing attached to the wiring diagrams. | | | Is the multifunction switch OK? Yes REPAIR the open circuit 15S-KA31 (GN/YE) or 15S-KA31A (GN/YE) (as of 08/2000 higher option content) or 15S-KA37 (GN/WH) or 8S-KA37 (WH/VT) (as of 08/2000 some models), between multifunction switch and rear wiper relay by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new multifunction switch. TEST the system for normal operation. | | A14: CHECK THE VOLTAGE AT THE REAR WIPER MOTOR LEFT OR RIGHT | | | 1 Connect Fuse F1.13 (BJB). | | | 2 Disconnect Rear wiper motor with rear doors:. - left-hand side from connector C496
- right-hand side from connector C497
| | | 3 Ignition switch in position II. | | | 4 Turn on the REAR WINDOW WIPER. | | | 5 Measure the voltage between rear wiper motor, connector C496, pin 3, circuit 32-KA32B (WH/RD) (left-hand side) or connector C497, pin3, circuit 32-KA32A (WH/RD) (right-hand side), harness side and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 32-KA32B (WH/RD) (left-hand side) or 32-KA32A (WH/RD) (right-hand side), between splice S234 and rear wiper motor by using the wiring diagrams. TEST the system for normal operation. | | A15: CHECK THE GROUND CONNECTION OF THE REAR WIPER MOTOR | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between rear wiper motor, connector C496, pin 2, circuit 31-KA28B (BK) (left-hand side) or connector C497, pin 2, circuit 31-KA28A (BK) (right-hand side), harness side and ground. | | | Is the resistance less than 2 ohms? Yes CHECK the rear wiper motor, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 31-KA28B (BK) (left-hand side) or 31-KA28A (BK) (right-hand side), between rear wiper motor and ground G401 (left-hand side) or G400 (right-hand side) by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST B : THE WIPERS STAY ON CONTINUOUSLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: CHECK THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Ignition switch in position II. | | | 4 Check the wipers. | | | Do the wiper(s) operate continuously? Yes - One rear window wiper (with rear doors): INSTALL a new rear wiper motor. TEST the system for normal operation. - Both rear window wipers (with rear doors) or the rear window wiper (with tailgate): GO to B4. No - The concern is the windshield wipers: GO to B8. - The concern is the rear window wiper(s): INSTALL a new multifunction switch. TEST the system for normal operation. | | B2: CHECK THE CIRCUIT BETWEEN MULTIFUNCTION SWITCH AND WINDSHIELD WIPER MOTOR FOR SHORT TO POWER | | | 1 Ignition switch in position 0. | | | 2 Disconnect Windshield wiper motor from connector C125. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between multifunction switch, connector C202b, pin 9, circuit 29S-KA10 (OG/BK), harness side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the short to power in circuit 29S-KA10 (OG/BK), 15S-KA10 (GN/BK) or 15S-KA10A (GN/BK) by using the wiring diagrams. TEST the system for normal operation. No | | B3: CHECK THE CIRCUIT BETWEEN MULTIFUNCTION SWITCH AND WINDSHIELD WIPER MOTOR FOR SHORT TO POWER | | | 1 Measure the voltage between multifunction switch, connector C202b, pin 8, circuit 15-KA11 (GN/OG), harness side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the short to power in circuit 15S-A11 (GN/OG) by using the wiring diagrams. TEST the system for normal operation. No CHECK the wiper motor according to the Component Test attached to this section, if necessary INSTALL a new one. TEST the system for normal operation. | | B4: DETERMINE THE FAULT CONDITION | | | 1 Ignition switch in position 0. | | | 2 Disconnect Rear wiper relay from connector C2020. | | | 3 Ignition switch in position II. | | | 4 Check the rear window wiper(s). | | | Do the wiper(s) operate continuously? Yes No | | B5: CHECK THE REAR WIPER MOTOR (LEFT) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Rear wiper motor:. - with tailgate from connector C4072
- with rear doors left-hand side from connector C496
| | | 3 Ignition switch in position II. | | | 4 Measure the voltage between rear wiper relay, socket C2020, pin 3, circuit 32-KA32 (WH/RD), relay box-side and ground. | | | Is battery voltage indicated? Yes - Vehicles with tailgate: LOCATE and REPAIR the short to power, in circuits connected with the rear wiper relay, socket C2020, pin 3 by using the wiring diagrams. TEST the system for normal operation. No CHECK the rear wiper motor, if necessary INSTALL a new one. TEST the system for normal operation. | | B6: CHECK THE REAR WIPER MOTOR RIGHT | | | 1 Ignition switch in position 0. | | | 2 Disconnect Rear wiper motor, right from connector C497. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between rear wiper relay, socket C2020, pin 3, circuit 32-KA32 (WH/RD), relay box-side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the short to power, in circuits connected with the rear wiper relay, socket C2020, pin 3 by using the wiring diagrams. TEST the system for normal operation. No CHECK the rear wiper motor right, if necessary INSTALL a new one. TEST the system for normal operation. | | B7: CHECK THE CIRCUITS BETWEEN MULTIFUNCTION SWITCH AND REAR WIPER RELAY | NOTE:The multifunction switch is in OFF position | | | 1 Measure the voltage between rear wiper relay, connector C2020, pin 5, circuit 15S-KA31(A) (GN/YE), harness side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the short to power in circuit 15S-KA31(A) (GN/YE) or 7S-TA62 (YE/VT) (as of 08/2000 higher option content), between multifunction switch and rear wiper relay by using the wiring diagrams. TEST the system for normal operation. No Check the rear wiper relay according to Component Testing attached to the wiring diagrams. If necessary INSTALL a new one. TEST the system for normal operation. | | B8: CHECK CIRCUIT 15S-KA15 (GN/OG) FOR SHORT TO POWER | | | 1 Ignition switch in position 0. | | | 2 Disconnect Windshield wiper relay from connector C2042. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between windshield wiper relay, socket C2042, pin 3, circuit 15S-KA15 (GN/OG), CJB-side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the short to power in circuit 15S-KA15 (GN/OG) by using the wiring diagrams. TEST the system for normal operation. No | | B9: CHECK THE CIRCUIT 32-KA9(A) (WH/BU) FOR SHORT TO POWER | | | 1 Ignition switch in position 0. | | | 2 Disconnect Windshield wiper motor from connector C125. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between windshield wiper relay, socket C2042, pin 1, circuit 32-KA9 (WH/BU), CJB-side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the short to power in circuit 32-KA9 (WH/BU) or 32-KA9A (WH/BU), between windshield wiper motor and windshield wiper relay by using the wiring diagrams. TEST the system for normal operation. No | | B10: CHECK THE WINDSHIELD WIPER MOTOR | | | 1 CHECK the windshield wiper motor according to the Component Test attached to this section. | | | Is the motor OK? Yes INSTALL a new windshield wiper relay. TEST the system for normal operation. No INSTALL a new windshield wiper motor. TEST the system for normal operation. | | PINPOINT TEST C : THE HIGH WIPER SPEED DOES NOT OPERATE CORRECTLY (INTERMITTENT WIPER MODE OK) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: CHECK THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Check the multifunction switch according to Component Testing attached to the wiring diagrams. | | | Is the multifunction switch OK? Yes No INSTALL a new multifunction switch. TEST the system for normal operation. | | C2: CHECK THE CIRCUIT BETWEEN MULTIFUNCTION SWITCH AND WINDSHIELD WIPER MOTOR FOR OPEN | | | 1 Ignition switch in position 0. | | | 2 Disconnect Windshield wiper motor from connector C125. | | | 3 Connect Multifunction switch with connector C202b. | | | 4 Ignition switch in position II. | | | 5 Turn on the FAST WIPER SPEED. | | | 6 Measure the voltage between windshield wiper motor, connector C125, pin 5, circuit 15-KA11A (GN/OG), harness side and ground. | | | Is battery voltage indicated? Yes CHECK the wiper motor according to the Component Test attached to this section, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 15-KA11 (GN/OG) or 15-KA11A (GN/OG) by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST D : THE LOW WIPER SPEED DOES NOT OPERATE CORRECTLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | D1: CHECK THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Check the multifunction switch according to Component Testing attached to the wiring diagrams. | | | Is the multifunction switch OK? Yes No INSTALL a new multifunction switch. TEST the system for normal operation. | | D2: CHECK THE CIRCUIT BETWEEN MULTIFUNCTION SWITCH AND WINDSHIELD WIPER MOTOR FOR OPEN | | | 1 Ignition switch in position 0. | | | 2 Disconnect Windshield wiper motor from connector C125. | | | 3 Connect Multifunction switch with connector C202b. | | | 4 Ignition switch in position II. | | | 5 Turn on the SLOW WIPER SPEED. | | | 6 Measure the voltage between windshield wiper motor, connector C125, pin 4, circuit 15S-KA10A (GN/BK), harness side and ground. | | | Is battery voltage indicated? Yes CHECK the wiper motor according to the Component Test attached to this section, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 29S-KA10 (OG/BK) or 15S-KA10(A) (GN/BK) by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST E : INTERMITTENT WIPER IS INOPERATIVE (OTHER FUNCTIONS OK) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | E1: DETERMINE THE FAULT CONDITION | | | 1 Ignition switch in position II. | | | 2 Turn on the SLOW WIPER SPEED and return to OFF. | | | 3 Check the windshield wipers. | | | Do the wipers return to the park position? Yes No | | E2: CHECK THE VOLTAGE AT THE WINDSHIELD WIPER RELAY | | | 1 Ignition switch in position 0. | | | 2 Disconnect Windshield wiper relay from connector C2042. | | | 3 Ignition switch in position II. | | | 4 Turn on the INTERMITTENT WIPE. | | | 5 Measure the voltage between windshield wiper relay, socket C2042, pin 5, circuit 15S-KA15A (GN/OG), CJB-side and ground. | | | Is battery voltage indicated? Yes No | | E3: CHECK THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Check the multifunction switch according to Component Testing attached to the wiring diagrams. | | | Is the multifunction switch OK? Yes REPAIR the open circuit 15S-KA15A (GN/OG), between multifunction switch and windshield wiper relay by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new multifunction switch. TEST the system for normal operation. | | E4: CHECK THE WINDSHIELD WIPER RELAY | | | 1 Ignition switch in position 0. | | | 2 Connect a fused jumper wire (30 A) at the windshield wiper relay, socket C2042, between pin 5, circuit 15S-KA15A (GN/OG) and pin 3, circuit 15S-KA15 (GN/OG), CJB-side. | | | 3 Ignition switch in position II. | | | 4 Turn on the INTERMITTENT WIPE. | | | 5 Check the windshield wipers. | | | Do the wipers operate with low speed? Yes INSTALL a new windshield wiper relay. TEST the system for normal operation. No INSTALL a new multifunction switch. TEST the system for normal operation. | | PINPOINT TEST F : THE WIPERS WILL NOT PARK AT THE CORRECT POSITION | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | F1: DETERMINE THE FAULTY WIPER(S) | | | 1 Determine the faulty wiper(s). | | | Do the windshield wipers not return to the park position? Yes No - The rear wiper (vehicles with tailgate) or the rear wiper, left-hand side (vehicles with rear doors): GO to F8. - The rear wiper, right-hand side (vehicles with rear doors): GO to F9. | | F2: DETERMINE THE FAULT CONDITION | | | 1 Ignition switch in position II. | | | 2 Turn on the INTERMITTENT WIPE. | | | 3 Check the windshield wipers. | | | Do the wipers operate with intermittent mode? Yes No | | F3: CHECK THE WINDSHIELD WIPER MOTOR | | | 1 Ignition switch in position 0. | | | 2 Disconnect Windshield wiper relay from connector C2042. | | | 3 Ignition switch in position II. | | | 4 Turn on the SLOW WIPER SPEED. | | | 5 Measure the voltage between windshield wiper relay, socket C2042, pin 1, circuit 32-KA9 (WH/BU), CJB-side and ground. | | | Is alternating battery voltage indicated? Yes No | | F4: CHECK THE GROUND CONNECTION OF THE WINDSHIELD WIPER RELAY | | | 1 Turn OFF the wipers. | | | 2 Ignition switch in position 0. | | | 3 Measure the resistance between windshield wiper relay, socket C2042, pin 2, circuit 31-KA14 (BK/GN), CJB-side and ground. | | | Is the resistance less than 2 ohms? Yes No REPAIR the open circuit 31-KA14 (BK/GN), between windshield wiper relay and ground G202 (LHD) or G203 (RHD) by using the wiring diagrams. TEST the system for normal operation. | | F5: CHECK THE WINDSHIELD WIPER RELAY | | | 1 Connect a fused jumper wire (30 A) at the windshield wiper relay, socket C2042, between pin 5, circuit 15S-KA15A (GN/OG) and pin 3, circuit 15S-KA15 (GN/OG), CJB-side. | | | 2 Ignition switch in position II. | | | 3 Turn on the INTERMITTENT WIPE. | | | 4 Check the windshield wipers. | | | Do the wipers operate with low speed? Yes INSTALL a new windshield wiper relay. TEST the system for normal operation. No INSTALL a new multifunction switch. TEST the system for normal operation. | | F6: CHECK THE VOLTAGE AT THE WINDSHIELD WIPER MOTOR | | | 1 Turn OFF the wipers. | | | 2 Ignition switch in position 0. | | | 3 Disconnect Windshield wiper motor from connector C125. | | | 4 Ignition switch in position II. | | | 5 Measure the voltage between windshield wiper motor, connector C125, pin 1, circuit 15-KA9 (GN/RD), harness side and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 15-KA9 (GN/RD), between splice S133 and wiper motor by using the wiring diagrams. TEST the system for normal operation. | | F7: CHECK THE CIRCUIT BETWEEN WIPER MOTOR AND WIPER RELAY FOR OPEN | | | 1 Ignition switch in position 0. | | | 2 Connect Windshield wiper relay with connector C2042. | | | 3 Connect a fused jumper wire (30 A) at the windshield wiper motor, connector C125, between pin 1, circuit 15-KA9 (GN/RD) and pin 2, circuit 32-KA9A (WH/BU), harness side. | | | 4 Ignition switch in position II. | | | 5 Measure the voltage between windshield wiper motor, connector C125, pin 4, circuit 15S-KA10A (GN/BK), harness side and ground. | | | Is battery voltage indicated? Yes CHECK the wiper motor according to the Component Test attached to this section, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 32-KA9(A) (WH/BU), between wiper motor and wiper relay by using the wiring diagrams. TEST the system for normal operation. | | F8: CHECK THE VOLTAGE AT THE REAR WIPER MOTOR (LEFT-HAND SIDE) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Rear wiper motor:. - with tailgate from connector C4072
- with rear doors left-hand side from connector C496
| | | 3 Ignition switch in position II. | | | 4 Measure the voltage between rear wiper motor, connector C4072 (with tailgate) or C496 (with rear doors) (left-hand side), pin 1, circuit 15-KA28B (GN/BU), harness side and ground. | | | Is battery voltage indicated? Yes CHECK the rear wiper motor, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 15-KA28B (GN/BU), between splice S237 and wiper motor by using the wiring diagrams. TEST the system for normal operation. | | F9: CHECK THE VOLTAGE AT THE REAR WIPER MOTOR RIGHT-HAND SIDE | | | 1 Ignition switch in position 0. | | | 2 Disconnect Rear wiper motor, right-hand side from connector C497. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between rear wiper motor, right-hand side, connector C497, pin 1, circuit 15-KA28A (GN/BU), harness side and ground. | | | Is battery voltage indicated? Yes CHECK the rear wiper motor, if necessary INSTALL a new one. TEST the system for normal operation. No REPAIR the open circuit 15-KA28A (GN/BU), between splice S237 and wiper motor by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST G : THE REAR WIPER(S) DO NOT OPERATE CORRECTLY WITH THE WASHER FUNCTION | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | G1: CHECK THE VOLTAGE AT CIRCUIT 15S-KA31(A) (GN/YE) AT THE REAR WIPER RELAY | | | 1 Ignition switch in position 0. | | | 2 Disconnect Rear wiper relay from connector C2020. | | | 3 Ignition switch in position II. | | | 4 Turn on the REAR WASHER and hold it during the measurement. | | | 5 Measure the voltage between rear wiper relay, socket C2020, pin 5, circuit 15S-KA31(A) (GN/YE), relay box-side and ground. | | | Is battery voltage indicated? Yes No Check the multifunction switch according to Component Testing attached to the wiring diagrams. If necessary INSTALL a new one. TEST the system for normal operation. | | G2: CHECK THE VOLTAGE AT CIRCUIT 15S-KA37 (GN/WH) OR 8S-KA37 (WH/VT) AT THE REAR WIPER RELAY | | | 1 Turn OFF the wiper(s). | | | 2 Measure the voltage between rear wiper relay, socket C2020, pin 4, circuit 15S-KA37 (GN/WH) or 8S-KA37 (WH/VT) (as of 08/2000 some models), relay box-side and ground. | | | Is battery voltage indicated? Yes INSTALL a new rear wiper relay. TEST the system for normal operation. No REPAIR the open circuit 15S-KA37 (GN/WH) or 8S-KA37 (WH/VT) (as of 08/2000 some models), between splice S219 and rear wiper relay by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST H : THE WASHER PUMP IS INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | H1: DETERMINE THE FAULT CONDITION | | | 1 Determine the fault condition. | | | Is the front and the rear washer inoperative? Yes No The front or the rear washer is inoperative: INSTALL an new multifunction switch. TEST the system for normal operation. | | H2: CHECK THE FUSE F1.11 (BJB) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Fuse F1.11 (BJB). | | | 3 CHECK Fuse F1.11 (10 A, diesel engines) or (20 A, petrol engines) (BJB). | | | Is the fuse OK? Yes No INSTALL a new fuse F1.11 (10 A, diesel engines) or (20 A, petrol engines) and TEST the system. If the fuse blows again, LOCATE and REPAIR the short circuit by using the wiring diagrams. TEST the system for normal operation. | | H3: CHECK THE VOLTAGE AT THE WASHER PUMP MOTOR | NOTE:The multifunction switch is in OFF position | | | 1 Connect Fuse F1.11 (10 A, diesel engines) or (20 A, petrol engines) (BJB). | | | 2 Disconnect Washer pump motor from connector C137. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between washer pump motor, connector C137, pin 1, circuit 15S-KA34 (GN/OG), harness side and ground. | | | Is battery voltage indicated? Yes No | | H4: CHECK THE VOLTAGE AT THE WASHER PUMP MOTOR | NOTE:The multifunction switch is in OFF position | | | 1 Measure the voltage between washer pump motor, connector C137, pin 2, circuit 31S-KA34A (BK/RD), harness side and ground. | | | Is battery voltage indicated? Yes No | | H5: CHECK THE WASHER PUMP MOTOR | | | 1 Turn on the WINDSHIELD WASHER and hold it during the measurement. | | | 2 Measure the voltage at the washer pump motor, connector C137, between pin 1, circuit 15S-KA34 (GN/OG) and pin 2, circuit 31S-KA34A (BK/RD), harness side. | | | Is battery voltage indicated? Yes INSTALL an new washer pump motor. TEST the system for normal operation. No | | H6: CHECK THE GROUND CONNECTION OF THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Measure the resistance between multifunction switch, connector C202b, pin 3, harness side and ground. | | | Is the resistance less than 2 ohms? Yes INSTALL a new multifunction switch. TEST the system for normal operation. No REPAIR the open circuit 31-KA7 (BK), between multifunction switch and ground G202 (RHD) or G203 (LHD) by using the wiring diagrams. TEST the system for normal operation. | | H7: CHECK THE VOLTAGE AT FUSE F1.11 (BJB) | | | 1 Measure the voltage between fuse F1.11 (BJB) and ground. | | | Is battery voltage indicated? Yes REPAIR the open circuit 15S-KA34 (GN/OG), between fuse F1.11 (BJB) and washer pump motor by using the wiring diagrams. TEST the system for normal operation. No | | H8: CHECK THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Check the multifunction switch according to Component Testing attached to the wiring diagrams. | | | Is the multifunction switch OK? Yes REPAIR the open circuit 15S-DG1 (GN/YE) or 8S-DG1 (WH), between splice S219 and fuse F1.11 (BJB) by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new multifunction switch. TEST the system for normal operation. | | H9: CHECK THE MULTIFUNCTION SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Multifunction switch from connector C202b. | | | 3 Check the multifunction switch according to Component Testing attached to the wiring diagrams. | | | Is the multifunction switch OK? Yes REPAIR the open circuit 31S-KA34(A) (BK/RD), between washer pump motor and multifunction switch by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new multifunction switch. TEST the system for normal operation. | Component Test Windshield wiper motor - Switch the ignition OFF.
- Disconnect the connector.
- Using a test cable and set up the test as in the following description.
- Using an external 12V DC supply which can be loaded to at least 10 Amps, or use fused battery voltage.
- Check the wiper motor in LOW WIPER SPEED condition
- Connect the power supply positive terminal with the positive terminal of the digital multimeter.
- Connect the power supply negative terminal with the wiper motor, pin 3.
- Connect the digital multimeter negative terminal with the wiper motor, pin 4. The wiper motor will run at low speed.
Measure the amperage. Is the value at the digital multimeter next to 1,5 A? If yes, GO to 2. If no, INSTALL a new wiper motor. - Check the wiper motor in HIGH WIPER SPEED condition (figure VFE0032244)
- Connect the power supply positive terminal with the positive terminal of the digital multimeter.
- Connect the power supply negative terminal with the wiper motor, pin 3.
- Connect the digital multimeter negative terminal with the wiper motor, pin 5. The wiper motor will run at high speed.
Measure the amperage. Is the value at the digital multimeter next to 2,2 A? If yes, GO to 3. If no, INSTALL a new wiper motor. - Check the wiper motor in WIPER PARK position
Measure the resistance at the wiper motor, between pin 2 and pin 3. Is the resistance less than 2 ohms? If yes, GO to 4. If no, GO to 4. and REPEAT this test step (If no again, INSTALL a new wiper motor). - Check the WIPER PARK function of the wiper motor
- Connect the power supply positive terminal with wiper motor, pin 1.
- Connect the power supply negative terminal with wiper motor, pin 3.
- Connect a jumper wire at the wiper motor, between pin 2 and pin 4.
Determine the condition Does the wiper motor move to the WIPER PARK position? If yes, the wiper motor is OK. If no, INSTALL a new wiper motor. |
