Test C: The Daytime Running Lamps (DRL) Are On With the Ignition Switch OFF
PINPOINT TEST C: THE DAYTIME RUNNING LAMPS (DRL) ARE ON WITH THE IGNITION SWITCH OFFC1-C4:
C5:
Normal Operation
The DRL relay 1 coil and input voltage is supplied by the central junction box (CJB) through circuit 295 (LB/PK) when the ignition switch is in the RUN position. When the DRL relay 1 is not energized (the parking brake is released), the DRL relay 1 routes voltage to the DRL relay 2 through circuit 175 (BK/YE). The DRL relay 2 then routes the voltage to the DRL relay 3 coil through circuit 1032 (WH/BK). The DRL relay 3 coil is grounded through circuit 57 (BK).
The DRL resistor receives voltage from the battery junction box (BJB) through circuit 554 (YE/BK). The voltage passes through the resistor to the DRL relay 3 through circuit 471 (OG/LG). When the DRL relay 3 is energized, the voltage is routed to the headlamps.
Possible Causes
- Circuit 175 (BK/YE) short to voltage
- Circuit 295 (LB/PK) short to voltage
- Circuit 1032 (WH/BK) short to voltage
- DRL relay 3