Low Beam Relay Coil Output Open/Short To Ground

LOW BEAM RELAY COIL OUTPUT OPEN/SHORT TO GROUND





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.






1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all Body Control Module DTCs.
3. Turn the ignition off, wait 10 seconds then turn the ignition on.
4. With the scan tool, read the current Body Control Module DTCs.
5. Turn the Low Beam Headlamps ON.

Does the scan tool display: HEADLAMP RELAY COIL OUTPUT OPEN/SHORT TO GROUND?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Inspect the related wiring harness for a possible intermittent condition.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. FUSE #6
1. Turn the ignition off.
2. Check fuse #6 in the PDC.

Is the fuse open?

Yes

- Replace fuse 6 in the PDC.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. HEADLAMP RELAY
1. Turn the ignition off.
2. Remove the Headlamp Relay from the Power Distribution Center.
3. Substitute the original Headlamp Relay with a known good relay.
4. Turn the ignition on.
5. With the scan tool, erase the current Body Control Module DTCs.
6. Turn the engine off, wait 10 seconds then turn the ignition on.
7. Turn the Low Beams ON.
8. With the scan tool, read the current Body Control Module DTCs.

Does the scan tool display: Low Beam Relay Coil Output Open/Short To Ground?

Yes

- Go To 4

No

- Replace the original Head Lamp Relay.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. (L124) HEADLAMP RELAY CONTROL CIRCUIT SHORT TO GROUND




1. Turn the ignition off.
2. Remove the Headlamp Relay from the Power Distribution Center.
3. Disconnect the Body Control Module C2 connector.
4. Measure the resistance of the (L124) Headlamp Relay Control circuit at the Headlamp Relay connector to ground.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (L124) Headlamp Relay Control circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. (L124) HEADLAMP RELAY CONTROL CIRCUIT OPEN




1. Turn the ignition off.
2. Remove the Headlamp Relay from the Power Distribution Center.
3. Disconnect the Body Control Module C2 connector.
4. Measure the resistance of the (L124) Headlamp Relay Control circuit between the BCM connector and the Headlamp Relay connector.

Is the resistance below 5.0 Ohms?

Yes

- Replace the Body Control Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (L124) Headlamp Relay Control circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.