| Diagnosis and Testing Refer to Wiring Diagrams Section 417-04, for schematic and connector information. Special Tool(s) | | Terminal probe kit 29-011A | Principles of Operations The daytime running lamps (DRL) are ON under the following conditions: - Ignition switch is in the RUN position
- Light switch is in the OFF position
The DRL system is designed to turn the low beam headlamps ON at reduced intensity. The driver can disable the DRL system by any one of the following actions: - Turning the ignition switch to any position except RUN
- Turning the light switch to any position except OFF
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 daytime running lamps are inoperative. | * Fuse(s) * Circuit(s) * Daytime running lamps relay * Daytime running lamps resistor(s) * Light switch * Central junction box (CJB) | * | | The daytime running lamps are on with ignition switch OFF. | * Circuit(s) * Daytime running lamps relay * Light switch | * | | The parking, rear and license lamps are inoperative with the daytime running lamps ON. | * Circuit(s) * Light switch | * | Pinpoint Tests | PINPOINT TEST A : THE DAYTIME RUNNING LAMPS ARE INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: CHECK FUSES F2.5 (CJB) AND F1.3 (BJB) | | | 1 Ignition switch in position 0. | | | 2 Disconnect Fuse F2.5 (CJB). | | | 3 Disconnect Fuse F1.3 (BJB). | | | 4 CHECK Fuse F2.5 (15 A) (CJB). | | | 5 CHECK Fuse F1.3 (20 A) (BJB). | | | Are the fuses OK? Yes No INSTALL a new fuse F2.5 (15 A) or F1.3 (20 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 F2.5 (CJB) | | | 1 Connect Fuse F2.5 (15 A) (CJB). | | | 2 Connect Fuse F1.3 (20 A) (BJB). | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between fuse F2.5 (15 A) (CJB) and ground. | | | Is battery voltage indicated? Yes No REPAIR the power supply of the fuse F2.5 (CJB), by using the wiring diagrams. If necessary INSTALL a new CJB. TEST the system for normal operation. | | A3: CHECK THE VOLTAGE AT THE CONTROL CIRCUIT AT DAYTIME RUNNING LAMPS RELAY | NOTE:The light switch is in OFF position. | | | 1 Ignition switch in position 0. | | | 2 Disconnect Daytime running lamps relay from connector C1000. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between daytime running lamps relay, socket C1000, pin 1, circuit 15-LE6 (GN/YE), BJB-side and ground. | | | Is battery voltage indicated? Yes No | | A4: CHECK THE GROUND CONNECTION OF THE DAYTIME RUNNING LAMPS RELAY | | | 1 Measure the voltage at the daytime running lamps relay, socket C1000, between pin 1, circuit 15-LE6 (GN/YE) and pin 2, circuit 31-LE6 (BK), BJB-side. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 31-LE6 (BK), between relay and ground G103, by using the wiring diagrams. TEST the system for normal operation. | | A5: CHECK THE VOLTAGE AT THE POWER CIRCUIT AT DAYTIME RUNNING LAMPS RELAY | | | 1 Measure the voltage between daytime running lamps relay, socket C1000, pin 3, circuit 30-LE7 (RD/BU), BJB-side and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 30-LE7 (RD/BU), between fuse F1.3 (BJB) and daytime running lamps relay, by using the wiring diagrams. TEST the system for normal operation. | | A6: CHECK THE CIRCUIT BETWEEN DAYTIME RUNNING LAMPS RELAY AND FUSE F1.24 (BJB) FOR OPEN | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between daytime running lamps relay, socket C1000, pin 5, circuit 30S-LE7 (RD/BU), BJB-side and fuse F1.24 (BJB). | | | Is the resistance less than 1 ohm? Yes INSTALL a new daytime running lamps relay. TEST the system for normal operation. No LOCATE and REPAIR the open in circuit 30S-LE7 (RD/BU) or 8-LE8(A) (WH/BU) (daytime running lamp resistors), between daytime running lamps relay and splice S104 by using the wiring diagrams. TEST the system for normal operation. | | A7: CHECK THE VOLTAGE AT THE LIGHT SWITCH | | | 1 Ignition switch in position 0. | | | 2 Disconnect Light switch from connector C205. | | | 3 Ignition switch in position II. | | | 4 Measure the voltage between light switch, connector C205, pin 8, circuit 15-DD1 (GN/YE), harness side and ground. | | | Is battery voltage indicated? Yes No REPAIR the open circuit 15-DA34 (GN/BK) or 15-DD1 (GN/YE), between fuse F2.5 (CJB) and light switch by using the wiring diagrams. TEST the system for normal operation. | | A8: CHECK THE LIGHT SWITCH | | | 1 Check the light switch according to Component Testing attached to the wiring diagrams. | | | Is the light switch OK? Yes REPAIR the open circuit 75-LE6 (YE) or 15-LE6 (GN/YE), between light switch and daytime running lamps relay 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 B : THE DAYTIME RUNNING LAMPS ARE ON WITH IGNITION SWITCH OFF | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: DETERMINE THE FAULT CONDITION | NOTE:The light switch is in OFF position. | | | 1 Ignition switch in position 0. | | | 2 Disconnect Daytime running lamps relay from connector C1000. | | | 3 Check the headlamps. | | | Do the low beams illuminate with reduced intensity? Yes No | | B2: CHECK AT THE CIRCUIT 15-LE6 (GN/YE) FOR SHORT TO POWER | | | 1 Measure the voltage between daytime running lamps relay, socket C1000, pin 1, circuit 15-LE6 (GN/YE), BJB-side and ground. | | | Is battery voltage indicated? Yes No INSTALL a new daytime running lamps relay. TEST the system for normal operation. | | B3: CHECK THE LIGHT SWITCH | | | 1 Disconnect Light switch from connector C205. | | | 2 Measure the voltage between daytime running lamps relay, socket C1000, pin 1, circuit 15-LE6 (GN/YE), BJB-side and ground. | | | Is battery voltage indicated? Yes LOCATE and REPAIR the short to power in circuit 75-LE6 (YE) or 15-LE6 (GN/YE, between light switch and daytime running lamps relay, by using the wiring diagrams. TEST the system for normal operation. No INSTALL a new light switch. TEST the system for normal operation. | | B4: DETERMINE THE FAULT CONDITION | | | 1 Disconnect Light switch from connector C205. | | | 2 Check the headlamps. | | | Do the low beams illuminate with reduced intensity? Yes LOCATE and REPAIR the short to power in circuits 30S-LE8 (RD/OG), 30S-LE7 (RD/BU) or 8-LE8(A) (WH/BU) (daytime running lamp resistor), connected with splice S124, by using the wiring diagrams. TEST the system for normal operation. No | | PINPOINT TEST C : THE PARKING, REAR AND LICENSE LAMPS ARE INOPERATIVE WITH THE DAYTIME RUNNING LAMPS ON. | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: CHECK THE CIRCUIT 30S-LE8 (RD/OG) FOR OPEN | | | 1 Ignition switch in position 0. | | | 2 Disconnect Light switch from connector C205. | | | 3 Disconnect Daytime running lamps relay from connector C1000. | | | 4 Measure the resistance between light switch, connector C205, pin 15, circuit 30S-LE8 (RD/OG), harness side and daytime running lamps relay, connector C1000, pin 5, circuit 30S-LE7 (RD/BU), harness side. | | | Is the resistance less than 2 ohms? Yes No REPAIR the open circuit 30S-LE8 (RD/OG), between light switch and splice S124, by using the wiring diagrams. TEST the system for normal operation. | | C2: CHECK THE LIGHT SWITCH | | | 1 Check the light switch according to Component Testing attached to the wiring diagrams. | | | Is the light switch OK? Yes No INSTALL a new light switch. TEST the system for normal operation. | |
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