Fault Code 2088

Fault code 2088

Auxiliary high beam headlight bulbs, left/right

NOTE: This fault can also be caused by a faulty fuse. Given this, it is advisable to check the fuse first before starting to check the wiring and components.

Diagnostic conditions
- Ignition on
- Internal control module function test
- Left auxiliary high beam headlight on/off

Possible causes of fault
- 'Short circuit to B+' Continuous lighting of auxiliary headlight bulb(s) can only be diagnosed when auxiliary headlight is switched off.
- 'Short circuit to ground' Failure of auxiliary headlight bulb(s) can only be diagnosed when auxiliary headlight is switched on.
- 'Open circuit/short circuit to B+' Continuous lighting of bulb(s) in the event of a 'short circuit to B+', can only be diagnosed when auxiliary headlight is switched on.
- 'Open circuit/short circuit to B+' No lighting of bulb(s) in the event of a 'disconnection', can only be diagnosed when auxiliary headlight is switched on.

Affected pins
Plug 'H' on vehicle electrical system control module:
- Pin 2 'output for auxiliary high beam headlight'

Diagnosis/troubleshooting

NOTE:
- Before replacing the control module, the ground connections, power supply and plug connections on the control module must be checked.
- When replacing the vehicle electrical system control module, observe the coding of the control module.
- After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again. Additional causes of faults that could damage the vehicle electrical system control module should be detected and remedied.