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Fault code 0327: Diagnosis/troubleshooting

NOTE: Visual inspection: In the next troubleshooting section, please check first that the affected pins on the rear convenience system control unit plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and correct contacts. Repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wires.
NOTE: Sporadic faults: In the event of faults that occur sporadically, the wiring positions that are linked to moving parts on and in the vehicle must be checked for each system. Various statuses that can cause faults must be simulated with the help of the wiring diagram.
NOTE: Battery voltage: A battery voltage of between 11.4 and 14.5 V is required for the following troubleshooting procedure. This must be checked and provided, if necessary. On the vehicle electrical system, the voltage to the fuse (input side) must be guaranteed.
WORK INSTRUCTION CHART

Work instruction Display OK If not OK
1 Check operation of sliding roof
  • Change position of sliding roof using the rotary switch.
 => Check for fault code 80.
Go to step 2
2 Check power supply to sliding roof control module
  • Switch off ignition.
  • Pull plug B off sliding roof control module.
  • Measure voltage on plug B (sliding roof control module) between pin 4 (terminal 30) and pin 1 (terminal 31).
 11.4 to 14.5 V
Go to step 6		 Go to step 3
3 Check fuse
  • Check fuse in left fuse carrier (F42 [30A]).
 Go to step 4 Replace fuse and remedy the cause, if necessary.
→ End
4 Check power supply line
  • Switch off ignition.
  • Measure voltage between sliding roof control module plug B, pin 4 and ground.
 11.4 - 14.5 V
Go to step 5		 Repair wiring.
→ End
  • Check resistance between fuse output in left fuse carrier (F42 [30A]) and pin 4 of sliding roof control module plug B.
 < 5 Ω
Go to step 5
5 Check ground supply line
  • Measure voltage between sliding roof control module plug B, pin 1 and ground.
 < 0.3 V
Go to step 6		 Repair wiring.
→ End
  • Measure resistance between sliding roof control module plug B, pin 1 and ground.
 < 5 Ω
Go to step 6		 Check ground pin 21, and repair it if necessary.
Repair wiring.
→ End
6 Check power supply to sliding roof rotary switch
  • Connect plug B to sliding roof control module.
  • Pull plug A off sliding roof control module.
  • Switch on ignition.
  • Check power supply between jacks for pin 1 and pin 2 on socket A.
 Approx. 5 V
Go to step 7		 Replace sliding roof control module.
→ End
7 Check power supply lines
  • Switch off ignition.
  • Connect plug A to sliding roof control module.
  • Pull plug A off sliding roof rotary switch.
  • Check voltage between pin 1 and pin 2 of rotary switch plug A.
 Approx. 5 V
Go to step 8		 Repair wiring.
→ End
  • Measure voltage between pin 1 and ground on rotary switch plug A.
8 Check wiring for continuity
  • Switch off ignition.
  • Pull plug A off sliding roof control module.
  • Check resistance between pin 1 of sliding roof plug A and pin 1 of sliding roof rotary switch plug A.
  • Check resistance between pin 2 of sliding roof plug A and pin 2 of sliding roof rotary switch plug A.
  • Check resistance between pin 3 of sliding roof plug A and pin 3 of sliding roof rotary switch plug A.
  • Check resistance between pin 5 of sliding roof plug A and pin 5 of sliding roof rotary switch plug A.
  • Check resistance between pin 6 of sliding roof plug A and pin 6 of sliding roof rotary switch plug A.
 < 5 Ω
Go to step 9		 Repair wiring.
→ End
9 Replace sliding roof rotary switch → End
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