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Fault code 1736: Diagnosis/troubleshooting

NOTE: Visual inspection: In the next troubleshooting section, please check first that the affected pins on the driver's door control module 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.

NOTE: 'Implausible signal' → The fault is detected if the resistance between plug B, pins 4 and 5 remains unchanged for more than 1.5 seconds during memory activation.
WORK INSTRUCTION CHART

Work instruction Display OK If not OK
1 Check operation of adjustment motor for driver's door mirror
  • Change vertical position of driver's door mirror using mirror adjustment switch.
 Go to step 2 => Check for fault code 939.
2 Check vertical potentiometer in driver's door mirror adjustment motor
  • Switch off ignition.
  • Remove adjustment motor for driver's door mirror.
  • Pull plug off door mirror adjustment motor.
  • Measure resistance on pins 1 and 7 of adjustment motor.
  • Measure resistance on pins 5 and 7 of adjustment motor.
  • Move adjustment motor by hand from stop to stop in vertical direction.
 Change in resistance of vertical potentiometer.
≥ 600 Ω
Go to step 3		 Go to step 7
3 Check power supply of vertical potentiometer to door mirror adjustment motor
  • Switch on ignition.
  • Measure voltage on adjustment motor plug between pin 1 and pin 5.
 Approx. 12 V
Go to step 6		 Go to step 4
4 Check wiring for short circuit to B+
  • Switch off ignition.
  • Pull off plug B on driver's door control module.
  • Measure voltage on adjustment motor plug between pin 1 and ground.
 < 0.3 V
Go to step 5		 Repair wiring.
→ End
  • Measure voltage between adjustment motor plug, pin 5 and ground.
  • Measure voltage between adjustment motor plug, pin 7 and ground.
5 Check wiring for short circuit to ground
  • Measure voltage on adjustment motor plug between pin 1 and battery positive connection.
 < 0.3 V
Go to step 6		 Repair wiring.
→ End
  • Measure voltage between adjustment motor plug, pin 5 and battery positive connection.
  • Measure voltage between adjustment motor plug, pin 7 and battery positive connection.
6 Check wiring for open circuit
  • Switch off ignition.
  • Measure resistance between pin 4 of control module plug B and pin 1 of adjustment motor plug.
 < 5 Ω
Go to step 8		 Repair wiring.
→ End
  • Measure resistance between pin 7 of control module plug B and pin 5 of adjustment motor plug.
  • Measure resistance between pin 13 of control module plug B and pin 7 of adjustment motor plug.
7 Replace driver's adjustment motor → End
8 Replace driver's door control module → End
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