Refer to
Automatic Headlamp Control Module, Ambient Light Sensor and BCM
.
Circuit Description
When the automatic headlamps are active and the ignition transitions from ON to OFF, the BCM will pull low the automatic headlamp link circuit, activating the delayed headlamp function of the automatic headlamp control module.
Conditions for Setting the DTC
The BCM detects a short to battery voltage in the automatic headlamp link circuit when commanding the delayed headlamp function on.
The condition must be present for more than 0.3 seconds.
Action Taken When the DTC Sets
The delayed headlamp function will be inoperative.
Conditions for Clearing the DTC
| • | The BCM no longer detect a short to battery voltage in the automatic headlamp link circuit. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the fault is no longer present. |
| • | The BCM receives a clear code command from the scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent short to battery voltage in the automatic headlamp link circuit. |
| - | The automatic headlamp control module is shorted to battery voltage. |
| - | The automatic headlamp module is shorted to battery voltage internally. |
| • | If the DTC is a history DTC, the problem may be intermittent. Try performing the tests shown while moving the wiring and connectors, this can often cause the malfunction to reappear. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for a short to voltage in automatic headlamp link circuit.
-
This step tests for a short to battery voltage internal to the automatic headlamp control module.
-
This step tests for a short to battery voltage in the body control module
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics | ||||
1 | Was the Diagnostic System Check performed? | -- | ||
Did you find and correct the condition? | -- | |||
Does the voltage read the specified value for both test? | B+ | |||
Does the voltage read the specified value? | B+ | |||
5 | Replace the Body Control Module (BCM). Refer to Body Control Module Replacement in Body Systems. Did you complete the repair? | -- | -- | |
6 | Replace the automatic headlamp control module. Refer to Headlamp Control Module Replacement in Body Systems. Did you complete the repair? | -- | -- | |
7 |
Are any current DTCs set? | -- | System OK | |
