Fault code 2579: Diagnosis/troubleshooting
NOTE:
- When troubleshooting, the status of the fault must be observed!
- Use a suitable test cable or a trailer (which is definitely OK) to check whether the fault is present on the vehicle or whether it is reoccurring.
- A short circuit to B+ can also be a short circuit to supply leads of other loads. The leads must be supplied with power for test purposes.
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Connect test cable (tool) or OK trailer to trailer socket and check whether functions are present or whether the fault occurs again | Fault does not occur again. Fault exists in trailer; repair bulb/light, plug connector or wiring. → End |
Fault is still present. Go to Step 2 |
|
| 2 | Check fault memory in the trailer hitch control module for [F8] fault | 'Open circuit' 'Short circuit to ground' Lamp is not lit Go to Step 3 'Short circuit to B+' Light is lit continuously Go to Step 4 |
||
| 3 | Check wiring in vehicle between trailer hitch control module and trailer socket for an open circuit |
|
< 5 Ω Go to Step 4 |
Repair wiring or replace wiring harness. → End |
| 4 | Check wiring in vehicle between trailer hitch control module and trailer socket for a short circuit to ground |
|
∞ Ω Go to Step 7 |
Repair wiring or replace wiring harness. → End |
| 5 | Check wiring in vehicle between trailer hitch control module and trailer socket for a short circuit to B+ (see note) |
|
< 0.3 V Go to Step 6 |
Repair wiring or replace wiring harness. → End |
| 6 | Check ground leads |
|
< 5 Ω Go to Step 7 |
Repair wiring or replace wiring harness. → End |
| 7 | Replace trailer hitch control module | → End | ||