Fault Code 4

FAULT CODE 4
Axle Position Sensor, Rear (Angle Sensor For HBA)

This fault is stored in the following cases:
1. Short circuit to voltage/ground or open circuit in the supply leads between the control module and angle sensor for HBA, rear
2. The sensor linkage is disengaged or faulty
3. Angle sensor for HBA is faulty
4. The control module is faulty

Fault Effect: No automatic adjustment possible
Headlights in safety position

Elimination:

- Visually inspect the sensor linkage and check the plastic holder of the sensor.

- Switch off ignition

- Pull plug off the angle sensor for HBA, rear.

- Switch ignition on

- measure voltage between terminal 5 of the sensor plug and ground

Voltmeter display: approx. 5 Volts

- measure voltage between terminal 5 and Terminal l of the sensor plug

Voltmeter display: apprux. 5 Volts

- In the PST2 menu item Actual values, select Sensor voltage, spring travel 2 (rear)

- Connect a wiring harness jumper to terminals 4 and 5 of the sensor plug

PST 2 display: approx. 5 Volts

- If no fault is detected in the wires, replace the angle sensor for HBA.