| Diagnosis and Testing Refer to Wiring Diagrams Section 417-01, 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 | Electrical | - Fuse(s)
- Bulb(s)
- Electrical connector(s)
- 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 fog lamps are inoperative | * Fuse * Circuit(s) * Light switch | * | | The front fog lamps are inoperative | * Circuit(s) * Light switch | * | | The rear fog lamp is inoperative | * Circuit(s) * Light switch | * | | Individual fog lamp is inoperative | * Circuit(s) * Fog lamp * Rear fog lamp | * | | The front fog lamps are on continuously | * Circuit(s) * Light switch | * | | The rear fog lamps are on continuously | * Circuit(s) * Light switch | * | Pinpoint Tests | PINPOINT TEST A : THE FOG LAMPS ARE INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: CHECK FUSE F44 (CJB) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Fuse F44 (CJB). | | | 3 CHECK Fuse F44 (20 A) (CJB). | | | Is the fuse OK Yes No INSTALL a new fuse F44 (20 A) and TEST the system for normal operation. If the fuse blows again, LOCATE and REPAIR the short to ground by using the wiring diagrams. TEST the system for normal operation. | | A2: CHECK THE VOLTAGE AT FUSE F44 (CJB) | | | 1 Connect Fuse F44 (CJB). | | | 2 Ignition switch in position II. | | | 3 Measure the voltage between F44 (CJB) and ground. | | | Is battery voltage indicated? Yes No LOCATE and REPAIR the open in the power supply of fuse F44 (CJB) by using the wiring diagrams. If necessary INSTALL a new CJB. TEST the system for normal operation. | | A3: CHECK THE POWER SUPPLY OF THE LIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Light switch from connector C320. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between light switch, connector C320, Pin 7, circuit 15-LD16 (GN/RD), harness side and ground. | | | Is battery voltage indicated? Yes CHECK the light switch according to component testing attached to the wiring diagrams, if necessary INSTALL a new one. TEST the system for normal operation. No LOCATE and REPAIR the open in circuit 15-LD16 (GN/RD) between fuse F44 (CJB) and light switch by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST B : THE FRONT FOG LAMPS ARE INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: CHECK THE LIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Light switch from connector C320. | | | 3 Connect a fused jumper wire (20 A) at the light switch, connector C320, between pin 7, circuit 15-LD16 (GN/RD), harness side and pin 3, circuit 15S-LD1 (GN/YE), harness side. | | | 4 Ignition switch in position II. | | | 5 Check the front fog lamps. | | | Do the front fog lamps illuminate? Yes INSTALL a new light switch. TEST the system for normal operation. No LOCATE and REPAIR the open in circuit 15S-LD1 (GN/YE) between light switch and splice S110 by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST C : THE REAR FOG LAMP IS INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: CHECK THE LIGHT SWITCH | NOTE:Do not remove the jumper wire if the concern is not rectified in this teststep. | | | 1 Ignition switch in position 0. | | | 2 Disconnect Light switch from connector C320. | | | 3 Connect a fused jumper wire (20 A) at the light switch, connector C320, between pin 7, circuit 15-LD16 (GN/RD) and pin 2, circuit 15S-LD6 (GN/YE), harness side. | | | 4 Ignition switch in position II. | | | 5 Check the rear fog lamp(s). | | | Do the rear fog lamp(s) illuminate? Yes CHECK the light switch if necessary INSTALL a new one. TEST the system for normal operation. No | | C2: CHECK THE POWER SUPPLY OF THE FOG LAMP REAR | | | 1 Ignition switch in position 0. | | | 2 Disconnect Fog lamp, rear from connector:. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between: - LHD: fog lamp, left rear, connector C434, pin 1, circuit 15S-LD6 (GN/YE), harness side and ground.
- RHD: fog lamp, right rear, connector C430, pin 1, circuit 15S-LG9 (GN/BK), harness side and ground.
| | | Is battery voltage indicated? Yes No LOCATE and REPAIR the open in circuit(s) between light switch and fog lamp rear by using the wiring diagrams. TEST the system for normal operation. | | C3: CHECK THE GROUND CONNECTION OF THE FOG LAMP REAR | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between: - LHD: fog lamp, left rear, connector C434, pin 2, circuit 31-LD6 (BK), harness side and ground.
- RHD: fog lamp, right rear, connector C430, pin 2, circuit 31-LG9 (BK), harness side and ground.
| | | Is the resistance less than 2 ohms? Yes CHECK the fog lamp rear if necessary INSTALL a new one. TEST the system for normal operation. No LOCATE and REPAIR the open in circuit(s) between fog lamp rear and splice S184 by using the wiring diagrams. TEST the system for normal operation. | | PINPOINT TEST D : INDIVIDUAL FOG LAMP IS INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | D1: DETERMINE THE FAULT CONDITION | | | 1 Ignition switch in position II. | | | 2 Switch on the FOG LAMPS. | | | 3 Check the front fog lamps. | | | Is the front fog lamp left hand side inoperative? Yes No The front fog lamp, right hand side is inoperative: GO to D3. | | D2: CHECK THE POWER SUPPLY OF THE FRONT FOG LAMP LEFT HAND SIDE | | | 1 Ignition switch in position 0. | | | 2 Disconnect Front fog lamp, left hand side from connector C302. | | | 3 Ignition switch in position II. | | | 4 Switch on the FRONT FOG LAMPS. | | | 5 Measure the voltage between front fog lamp left hand side, connector C302, pin 2, circuit 15S-LD11 (GN/WH), harness side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the open in circuit 31-LD11 (BK) between front fog lamp and splice S121 by using the wiring diagrams. If necessary INSTALL a new front fog lamp. TEST the system for normal operation. No LOCATE and REPAIR the open in circuit between splice S110 and front fog lamp by using the wiring diagrams. If necessary INSTALL a new front fog lamp. TEST the system for normal operation. | | D3: CHECK THE POWER SUPPLY OF THE FRONT FOG LAMP RIGHT HAND SIDE | | | 1 Ignition switch in position 0. | | | 2 Disconnect Front fog lamp, right hand side from connector C304. | | | 3 Ignition switch in position II. | | | 4 Switch on the FRONT FOG LAMPS. | | | 5 Measure the voltage between front fog lamp right hand side, connector C304, pin 2, circuit 15S-LD17 (GN/WH), harness side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the open in circuit 31-LD17 (BK) between front fog lamp and splice S109 by using the wiring diagrams. CHECK the front fog lamp, if necessary INSTALL a new one. TEST the system for normal operation. No LOCATE and REPAIR the open in circuit between splice S110 and front fog lamp by using the wiring diagrams. CHECK the front fog lamp, if necessary INSTALL a new one. TEST the system for normal operation. | | PINPOINT TEST E : THE FRONT FOG LAMPS ARE ON CONTINUOUSLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | E1: CHECK THE LIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Light switch from connector C320. | | | 3 Ignition switch in position II. | | | 4 Check the front fog lamps. | | | Do the front fog lamps illuminate? Yes LOCATE and REPAIR the short to power in circuits connected with splice S110 by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new light switch. TEST the system for normal operation. | | PINPOINT TEST F : THE REAR FOG LAMPS ARE ON CONTINUOUSLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | F1: CHECK THE LIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Light switch from connector C320. | | | 3 Ignition switch in position II. | | | 4 Check the rear fog lamps. | | | Do the rear fog lamps illuminate? Yes LOCATE and REPAIR the short to power in circuits connected with light switch, connector C320, pin 2 by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new light switch. TEST the system for normal operation. | |
