B2667

DTC B2667

Circuit Description

The headlamp leveling module receives inputs from the front and rear suspension position sensors to determine vehicle pitch. The suspension position sensors send an output to the headlamp leveling module as the vehicle suspension compresses and rebounds. The headlamp leveling module calculates the difference in vehicle pitch and sends a command to the headlamp leveling actuators. The headlamp leveling actuators drive the headlamps to the position commanded by the headlamp leveling module. The headlamp leveling module monitors the headlamp leveling actuator motor control circuits for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory.

DTC Descriptors

This diagnostic procedure supports the following DTC:

DTC B2667 AHLD Left Servo Driver Terminal 1 Circuit





Conditions for Running the DTC

The headlamp leveling module performs this diagnostic test mode every 0.8 millisecond when the following conditions are met:

* The ignition is in the ON or CRANK position.
* The headlamps are ON.

Conditions for Setting the DTC

DTC B2667 02

Will set when the headlamp leveling module detects a short to ground in the left headlamp leveling actuator motor 1 control circuit after 4 consecutive monitoring cycles.

DTC B2667 05

Will set when the headlamp leveling module detects an open or short to voltage in the left headlamp leveling actuator motor 1 control circuit after 4 consecutive monitoring cycles.

Action Taken When the DTC Sets

When DTC B2667 sets, the headlamp leveling module will disable all requests to both headlamp leveling actuators.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTCs command.
* A history DTC will clear once 40 consecutive malfunction-free ignition cycles have occurred.

Diagnostic Aids

Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test

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