B1685
B1685-00-LEFT HEADLAMP LEVELING MOTOR CONTROL CIRCUIT PERFORMANCE
For a complete wiring diagram, refer to the Wiring Information.
- When Monitored:
Continuously with the ignition on.
- Set Condition:
The Automatic Headlamp Leveling Module (AHLM) detects a short to voltage, short to ground, or an open on the (D503) LIN Lighting circuit.
1. CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
- Go To 2
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
2. (D503) LIN LIGHTING CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Right Front Headlamp Assembly C2 harness connector.
3. Disconnect the Left Front Headlamp Assembly C5 harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (D503) LIN Lighting circuit.
Is there any voltage present?
Yes
- Repair the (D503) LIN Lighting circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Go To 3
3. (D503) LIN LIGHTING CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Measure the resistance between ground and the (D503) LIN Lighting circuit.
Is the resistance below 10K Ohms?
Yes
- Repair the (D503) LIN Lighting circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Go To 4
4. (D503) LIN LIGHTING CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (D503) LIN Lighting circuit.
Is the resistance above 5.0 Ohms?
Yes
- Repair the (D503) LIN Lighting circuit for an open or high resistance.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace the AHLM. Headlamp Leveling Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.