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Fault code 20: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING - FAULT CODE 20

Work instruction Display OK If not OK
1 Check 5 V supply voltage of carrier with gear unit
  • Switch off ignition.
  • Pull off plug on carrier with gear unit.
  • Switch on ignition.
  • Measure voltage between pin 3 and ground.
 Approx. 5 V
Step 2		 Step 4
2 Check ground lead of carrier with gear unit
  • Measure voltage between pins 3 and 7 on plug of carrier with gear unit.
 Approx. 5 V
Step 3		 Step 7
3 Check signal lead of carrier with gear unit
  • Select Voltage of right horizontal mirror potentiometer in the Actual values menu item.
  • Connect jumper between pins 3 and 5.
 0 V without jumper
Approx. 5 V with jumper
Step 11		 Step 8
4 Check 5 V supply line for short circuit to ground
  • Switch off ignition.
  • Pull off mirror plug on control module.
  • Measure resistance between plug on carrier pin 3 and ground.
  • Measure resistance between plug on carrier pin 3 and pin 7.
 Step 5 Repair wiring harness.
-> End
5 Check 5 V supply line for short circuit to B+
  • Switch on ignition.
  • Measure voltage between pin 5 and ground on carrier with gear unit.
 0 V
Step 6		 Repair wiring harness.
-> End
6 Check 5 V supply line for open circuit
  • Switch off ignition.
  • Measure resistance between pin 5 of mirror plug on control module and pin 5 of carrier with gear unit.
 < 5
Step 12		 Repair wiring harness.
-> End
7 Check ground lead for open circuit
  • Switch off ignition.
  • Pull off mirror plug on control module.
  • Measure resistance between pin 4 of mirror plug and pin 7 of plug on carrier with gear unit.
 < 5
Step 12		 Repair wiring harness.
-> End
8 Check signal lead for short circuit to ground
  • Switch off ignition.
  • Pull plug off the control module.
  • Measure resistance between plug on carrier with gear unit pin 5 and ground.
  • Measure resistance between pins 5 and 7 of plug on carrier with gear unit.
 Step 9 Repair wiring harness.
-> End
9 Check signal lead for short circuit to B+
  • Switch on ignition.
  • Measure voltage between plug on carrier with gear unit pin 5 and ground.
 0 V
Step 10		 Repair wiring harness.
-> End
10 Check signal lead for open circuit
  • Switch off ignition.
  • Measure resistance between pin 5 of plug on carrier with gear unit and pin 6 of mirror plug on control module.
 < 5
Step 12		 Repair wiring harness.
-> End
11
  • Replace carrier with gear unit
 -> End
12
  • Replace control module
 -> End
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