Fault Code 0021

Fault code 0021

HBA (Xenon) control module faulty

NOTE:
- Please refer also to the information in the chapter "Introduction".
- If it is not possible to communicate with the HBA (Xenon light) control modules in the headlight, this may be caused by incorrect coding, e.g. both headlights are coded on one side --> remove one headlight and restart connection setup to the other (headlight) control module using the Porsche System Tester II No. 9588. Code control module correctly.

WARNING:
Danger of injury from high voltage.
- The light should always be switched off when removing and installing the headlights.
- The gas discharge lamp should only be operated when installed in the headlight.
- Only carry out repairs to the headlight or the wiring when the part is removed and disconnected from the power supply.

WARNING:
Coding: Make sure that the headlight system is coded correctly in the vehicle electrical system control module (always code Xenon headlights as well).
- Incorrect coding in the vehicle electrical system control module can damage the HBA Xenon control module.

Diagnostic conditions
- Ignition and dipped beam headlight switched on
- Internal control module function test

Possible cause of fault
- HBA (Xenon) control module faulty

Affected pins
Headlight mounting plate plug: pins 5 and 7

Diagnosis/troubleshooting

NOTE: The numbering of the pins on the headlight housing plug can be seen as a mirror image of the headlight mounting plate plug shown.