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Fault code 18: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 18)

Work instruction Display OK If not OK
1 Check wire from the alarm system control module to the switch for power windows for short to ground.
  • Switch off the ignition.
  • Pull plug A off the alarm system control module.
  • Pull plug off switch for sliding roof.
  • Pull plug off switch for power windows.
  • Measure resistance between plug A on alarm system control module pin 18 and ground.
 Step 2 Repair wiring harness.
-> End
2 Check wire from the alarm system control module to the switch for power windows for open circuit.
  • Measure resistance between plug A on the alarm system control module pin 18 and plug pin 4 on the switch for power windows.
 < 5
Step 3		 Repair wiring harness.
-> End
3 Check wire from the switch for power windows to the power window motors on the right and left for short circuit to ground.
  • Pull plug off the power window motor on the right and left.
  • Measure resistance between pin 1 of each switch for power windows and ground.
  • Measure resistance between pin 2 of each switch for power windows and ground.
 Step 4 Repair wiring harness.
-> End
4 Check wire from the switch for power windows to the power window motors on the right and left for open circuit.
  • Measure resistance between pin 1 of each switch for power windows and pin 4 of each plug on power window motors.
  • Measure resistance between pin 2 of each switch for power windows and pin 3 of plug on power window motors.
 < 5
Step 5		 Repair wiring harness.
-> End
5 Detect faulty component.
  • Push plug back onto switch for sliding roof.
  • Connect special tools 9616 and 9617.
  • Measure voltage on 88-pin test adapter cable 9616, pin 18 and ground.
 > 11 V
Step 6		 Check switch for sliding roof and wiring to drive unit for the sliding roof.
-> End
6 Detect faulty component.
  • Push plug back onto left power window motor.
  • Push plug back onto switch for left power window.
  • Actuate switch for left power window and simultaneously measure the voltage between 88-pin test adapter cable 9616, pin 18 and ground.
 > 11 V
Step 7		 Step 8
7 Detect faulty component.
  • Push plug back onto right power window motor.
  • Push plug back onto switch for left power window.
  • Actuate switch for left power window and simultaneously measure the voltage between 88-pin test adapter cable 9616, pin 18 and ground.
 > 11 V
-> End		 Step 9
8
  • Replace left power window motor.
 -> End
9
  • Replace right power window motor.
 -> End
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