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. Diagrams By Number
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 detects the ignition in RUN, the BCM provides ground for the DRL relay coil, energizing the relay. The DRL 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 detects a short to ground from the DRL relay coil ground controlled circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- DRL relay
- BCM
PINPOINT TEST G: THE DRL ARE ON WITH THE IGNITION OFF
-------------------------------------------------
G1 CHECK THE DRL RELAY OUTPUT
- Ignition OFF.
- Disconnect: DRL Relay.
- Do the headlamps continue to illuminate?
Yes
GO to G2.
No
GO to G3.
-------------------------------------------------
G2 CHECK THE DRL RELAY OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Low Beam Relay.
- Measure the voltage between the DRL relay pin 5, circuit CLF13 (YE/BU), BJB 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 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 relay. TEST the system for normal operation.
-------------------------------------------------
G4 CHECK THE DRL RELAY COIL GROUND CONTROLLED CIRCUIT FOR A SHORT TO GROUND
- Disconnect: BCM C2280D.
- Measure the resistance between the BCM 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 OPERATION
- Disconnect all the BCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM 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. REFER to Multifunction Electronic Modules Body Control Module (BCM). 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.
-------------------------------------------------