Fault Code 5

Fault, Fault Code 5

5 V supply for axle position sensors (angle sensors for HBA)

Possible causes, elimination, notes
This fault is stored in the following cases:
1. Short circuit to voltage/ground in the supply leads between the control module and angle sensors for HBA
2. Angle sensor for HBA is faulty
3. The control module is faulty

NOTE: The 5V supply voltage for the sensors is ensured via terminal 14 on the HBA control module. A fault in this supply lead affects both angle sensors.

Elimination:
- Switch off ignition
- Pull plug off the angle sensor for HBA, front
- Switch ignition on
- Read the fault memory and observe whether fault code 5 reappears.

If fault code 5 does not reappear, the supply lead to the angle sensor for HBA, front, is faulty. Proceed as follows in this case.

- Measure voltage between terminal 5 of the sensor plug and ground
Voltmeter display approx. 5 V

- Measure voltage between terminal 5 and terminal 1 of the sensor plug
Voltmeter display approx. 5 V

- In the PST2 menu item Actual values, select Sensor voltage, spring travel 1
- Connect a jumper to terminals 4 and 5 of the sensor plug
PST2 display approx. 5 V

If no fault is detected in the wires or control module, replace the angle sensor for HBA, front.

If fault code 5 reappears after the plug has been removed from the angle sensor for HBA, front, there is a fault in the supply lead to the angle sensor for HBA, rear. Proceed as follows in this case.

- Pull plug off the angle sensor for HBA, rear
- Measure voltage between terminal 5 of the sensor plug and ground
Voltmeter display approx. 5 V

- Measure voltage between terminal 5 and terminal 1 of the sensor plug
Voltmeter display approx. 5 V

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

- Connect a jumper to terminals 4 and 5 of the sensor plug
PST2 display approx. 5 V

If no fault is detected in the wires or control module, replace the angle sensor for HBA, rear.