Pinpoint Test G: The Daytime Running Lamps (DRL) Are On With The Ignition Off

Daytime Running Lamps (DRL)

Pinpoint Test G: The Daytime Running Lamps (DRL) Are On With The Ignition Off

Refer to Wiring Diagram Set 85, Headlamps for schematic and connector information Electrical Diagrams.

Normal Operation

Voltage at all times to the switch and coil sides of the Daytime Running Lamps (DRL) relay. Voltage is supplied from an ignition switch input circuit to the Body Control Module (BCM) when the ignition is in RUN.

When the headlamps are not on and the BCM (Body Control Module) detects the ignition in RUN, the BCM (Body Control Module) provides ground for the DRL (Daytime Running Lamps) relay coil, energizing the relay. The DRL (Daytime Running Lamps) relay provides voltage to the low beam relay through a resistor wire. The voltage passes through the low beam relay and on to the existing low beam circuitry, illuminating the headlamps at a reduced intensity.

- DTC B1092:14 (Daytime Running Light Relay: Circuit Short To Ground Or Open)- a continuous and on-demand DTC that sets when the BCM (Body Control Module) detects a short to ground from the DRL (Daytime Running Lamps) relay coil ground controlled circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- DRL (Daytime Running Lamps) relay

- BCM (Body Control Module)

PINPOINT TEST G : THE DRL (Daytime Running Lamps) ARE ON WITH THE IGNITION OFF

G1 CHECK THE DRL (Daytime Running Lamps) RELAY OUTPUT

- Ignition OFF.

- Disconnect: DRL (Daytime Running Lamps) Relay.

Do the headlamps continue to illuminate?

Yes
GO to G2.

No
GO to G3.

G2 CHECK THE DRL (Daytime Running Lamps) RELAY OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Disconnect: Low Beam Relay.

- Measure the voltage between the DRL (Daytime Running Lamps) relay pin 5, circuit CLF13 (YE/BU), BJB (Battery Junction Box) face side and ground.





Is any voltage present?

Yes
REPAIR circuit CLF13 (YE/BU) for a short to voltage. TEST the system for normal operation.

No
GO to Pinpoint Test C Pinpoint Test C: The Low Beams Are Always On.

G3 CHECK THE DRL (Daytime Running Lamps) RELAY

- Substitute a known good relay.

Do the headlamps continue to illuminate?

Yes
REMOVE the known good relay. GO to G4.

No
REMOVE the known good relay. INSTALL a new DRL (Daytime Running Lamps) relay. TEST the system for normal operation.

G4 CHECK THE DRL (Daytime Running Lamps) RELAY COIL GROUND CONTROLLED CIRCUIT FOR A SHORT TO GROUND

- Disconnect: BCM (Body Control Module) C2280D.

- Measure the resistance between the BCM (Body Control Module) C2280D-8, circuit CLF10 (GN/OG), harness side and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to G5.

No
REPAIR circuit CLF10 (GN/OG) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.

G5 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Disconnect all the BCM (Body Control Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the BCM (Body Control Module) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.