B3410

DTC B3410

Circuit Description

The headlamp leveling sensor front provides the headlamp leveling control modules with front axle position information. The headlamp leveling switch bit 1 signal circuit is shared between the 2 headlamp leveling control modules. The sensor is permanently grounded and has battery voltage supplied with the ignition in the ON position. The sensor arm is connected to the control arm of the front suspension. As the vehicle travels the suspension compresses and rebounds moving the headlamp leveling sensor front arm. This causes the signal output of the sensor to change. The headlamp leveling control modules then compares this information with the headlamp leveling sensor rear information and adjusts the headlamp leveling accordingly.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3410 AHLD Front Axle Sensor Signal Circuit

Conditions for Running the DTC

Each of the headlamp leveling control modules run the DTC every 40 milliseconds when the following conditions are met.

* The ignition is ON.
* The headlamps are ON.

Conditions for Setting the DTC

Each time the DTC is ran and a fault is detected an internal counter in each of the headlamp leveling control modules is increased by one. When the counter reaches 5 the DTC is set as current.

Action Taken When the DTC Sets

The headlamp leveling control module uses an internal offset of the headlamp leveling sensor rear in order to keep the leveling system active.

Conditions for Clearing the DTC

Each time the DTC is ran and a fault is not detected the counter is decreased by one until the counter reaches 0.

Test Description

Step 1 - Step 12:

Step 13 - Step 14:

The numbers below refer to the step numbers on the diagnostic table.
3. This step determines the proper diagnostic path for the DTC.
4. This step tests for battery voltage at the headlamp leveling sensor front.
5. This step tests for an open in the headlamp leveling sensor front ground circuit.
6. This step tests for both a short to ground and a short to battery voltage.
7. This step tests for an open or high resistance between the headlamp leveling sensor front and the headlamp leveling control module that has the DTC present.