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Fault code 2568: 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.
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 exists in trailer; repair light, plug connection or wiring.
→ End		 Go to Step 2
2 Check fault memory in the trailer hitch control module for [F8] fault 'Short circuit to ground' Light 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 a short circuit to ground
  • Switch off ignition.
  • Pull off plug A on trailer hitch control module.
  • Check resistance between trailer socket, pin 8, (7 in North America) and ground.
 ∞ 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 B+ (see note)
  • Push plug A on to trailer hitch control module.
  • Switch on ignition.
  • Check voltage between trailer socket, pin 6, (7 in North America) and ground.
 < 0.3 V
Go to Step 5		 Repair wiring or replace wiring harness.
→ End
5 Check ground leads
  • Measure resistance between trailer socket, pin 3, (pin 2 in North America) and vehicle ground.
 < 5 Ω
Go to Step 6		 Repair wiring or replace wiring harness.
→ End
6 Replace trailer hitch control module → End
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