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Fault code 0937: Diagnosis/troubleshooting

NOTE: Visual inspection: In the next troubleshooting section, please check first that the affected pins on the rear left 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:
  • 'Short circuit to ground' → The fault is detected if there is ground potential for more than five minutes on plug B, pin 5.
  • 'Implausible signal' → This fault is detected if the resistance between pins 5 and 16 on plug B is between 360 and 470 Ω.
WORK INSTRUCTION CHART

Work instruction Display OK If not OK
1 Check status of 'switch for rear left power window'
  • Use the 9588 Porsche System Tester II to switch to the menu 'Input signals/Switch for rear left power window'.
  • Press the switch in all possible positions.
 Status of 'switch for rear left power window' stays in one of the following positions:
'Manual up'
'Manual down'
Go to step 2
Status of 'switch for rear left power window' in at least one position changes to:
'Implausible signal'
Go to step 5
Status of 'switch for rear left power window' (switch not pressed) is:
'Implausible signal'
Go to step 2
Status of 'switch for rear left power window' changes according to switch actuation:
'Manual up'
'Automatic Up'
'Manual down'
'Automatic down'
Go to step 8
2 Check switch for rear left power window
  • Pull plug off 'switch for rear left power window'.
 Status of 'switch for rear left power window' changes to:
'Not actuated'
Go to step 7		 Go to step 3
3 Check wiring from rear left door control module to switch for short circuit to ground
  • Switch off ignition.
  • Measure resistance between control module plug B, pin 5 and ground.
 ∞ Ω
Go to step 4		 Repair wiring.
→ End
4 Check wiring from rear left door control module to switch for short circuit
  • Measure resistance between pins 5 and 16 of control module plug B
 ∞ Ω
Go to step 8		 Repair wiring.
→ End
5 Check operation of switch for rear left power window
  • Pull plug off switch for rear left power window.
  • Measure resistance at the switch between pins 1 and 2.
  • Press the switch in all possible positions.
 'Not actuated'
∞ Ω
'Manual up'
1750 to 1800 Ω
'Manual down'
150 to 170 Ω
Go to step 6		 Go to step 7
6 Check wiring from rear left door control module to switch for continuity
  • Measure resistance between pin 5 of control module plug B and pin 1 of plug on switch.
  • Measure resistance between pin 16 of control module plug B and pin 2 of plug on switch.
 < 5 Ω
Go to step 8		 Repair wiring.
→ End
7 Replace switch for rear left power window → End
8 Replace rear left door control module → End
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