Pinpoint Test Aa: The Daytime Running Lamps Are On With The Ignition Switch Off

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

AA1 CHECK THE BASE HEADLAMP CIRCUITRY
- Key in OFF position.
- Disconnect: Daytime Running Lamps (DRL) Resistor C196
- Do the headlamps continue to illuminate?
1. YES : REFER to Headlamps in this article.
2. NO : Go to AA2.
AA2 CHECK CIRCUIT 471 (OG/LG) FOR A SHORT TO VOLTAGE
- Connect: DRL Resistor C196
- Disconnect: DRL Relay
- Do the headlamps continue to illuminate?
1. YES : REPAIR the circuit. TEST the system for normal operation.
2. NO : Go to AA3.
AA3 CHECK CIRCUIT 1731 (RD/BK) FOR A SHORT TO VOLTAGE
- Connect: DRL Relay
- Disconnect: DRL Enable Relay
- Do the headlamps continue to illuminate?
1. YES : REPAIR the circuit. TEST the system for normal operation.
2. NO : Go to AA4.
AA4 CHECK THE DRL ENABLE RELAY
- Carry out the DRL enable relay component test. Refer to COMPONENT TESTING.
- Is the DRL enable relay OK?
1. YES : Go to AA5.
2. NO : INSTALL a new DRL relay. TEST the system for normal operation.
AA5 CHECK CIRCUIT 295 (LB/PK) FOR A SHORT TO VOLTAGE
- Connect: DRL Enable Relay
- Disconnect: CJB C270b
- Do the headlamps continue to illuminate?
1. YES : REPAIR the circuit. TEST the system for normal operation.
2. NO : Go to AA6.
AA6 CHECK THE CJB
- Connect: CJB C270b
- Disconnect: CJB C270g
- Do the headlamps continue to illuminate?
1. YES : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
2. NO : Go to AA7.
AA7 CHECK CIRCUIT 964 (DB/LG) FOR SHORT TO VOLTAGE
- Connect: CJB C270g
- Disconnect: Ignition Switch C250
- Do the headlamps continue to illuminate?
1. YES : REPAIR the circuit. TEST the system for normal operation.
2. NO : INSTALL a new ignition switch. REFER to STEERING COLUMN SWITCHES article. TEST the system for normal operation.