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Fault code 24: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING - FAULT CODE 24

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