Fault code 2231: Diagnosis/troubleshooting
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
| Work instruction | Display OK | If not OK | |
|---|---|---|---|
| 1 | Up to model year '05: Carry out the following checks on the wiring from 'pin B3' 'brake light' on 'trailer hitch control unit' to brake light relay in relay carrier/left of dashboard:
|
Go to Step 2 | Correct any existing faults. → End |
| As of model year '05: Carry out the following checks on the wiring from 'pin B3' 'brake light' on 'trailer hitch control unit' to 'pin 35' on 'PSM control unit' and 'rear convenience system control unit':
|
Go to Step 3 | Correct any existing faults. → End |
|
| 2 | Check the 'brake light relay' in relay carrier/ left of dashboard | Go to Step 3 | Correct any existing faults. → End |
| 3 | Read out fault memory for PSM control unit | For further troubleshooting, please follow the diagnosis instructions for the PSM control unit, refer to PSM
article
. → End |
|