B3410

DTC B3410

CIRCUIT DESCRIPTION
The front axle sensor provides the headlamp leveling control modules with front axle position information. The signal circuit is shared between the two 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 front axle sensor arm.

This causes the signal output of the sensor to change. The headlamp leveling control modules then compares this information with the rear axle sensor information and adjusts the headlamp leveling accordingly.

CONDITIONS FOR RUNNING THE DTC
Each of the headlamp leveling control modules run the DTC every 40ms when the follow 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 1. 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 rear axle sensor 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 1 until the counter reaches 0.

DIAGNOSTIC AIDS
- The following may cause an intermittent:
- Bent terminal
- Backed out terminal
- Damaged terminal
- Poor terminal tension
- Chafed wire
- Broken wire inside the insulation
- When diagnosing for an intermittent short or an open, manipulate the wire harness while watching the test equipment for changes.

TEST DESCRIPTION

Steps 1-2:

Steps 3-9:

Steps 10-14:

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 test for battery voltage at the front axle sensor.
5. Test for an open in the front axle sensor ground circuit.
6. Test for both a short to ground and a short to battery voltage.
7. Test for an open or high resistance between the front axle sensor and the headlamp leveling control module that has the DTC present.