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Fault code 0040: 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: This fault is detected as soon as there is ground potential for more than 10 minutes on plug A, pin 22.
WORK INSTRUCTION CHART

Work instruction Display OK If not OK
1 Check status of 'switch panel (child-lock button)'
  • Use the 9588 Porsche System Tester II to switch to the menu 'Input signals/switch panel, driver's door (child-lock button)'.
  • Pull off plug on driver's switch module.
 Status of 'switch panel (child-lock button)' changes from 'actuated' to 'not actuated'.
Go to step 5
Status of 'switch panel (child-lock button)' does not change.
Go to step 2
Status of 'switch panel (child-lock button)' is 'not installed'.
=> Check coding.
2 Check wiring for short circuit to B+
  • Switch off ignition.
  • Pull plug A off driver's door control module.
  • Switch on ignition.
  • Measure voltage between control module plug A, pin 22 and ground.
 < 3 V
Go to step 3		 Repair wiring.
→ End
3 Check wiring for short circuit to ground
  • Measure resistance between control module plug A, pin 22 and ground.
 ∞ Ω
Go to step 4		 Repair wiring.
→ End
4 Check wiring for short circuit
  • Measure resistance between control module plug A, pin 22 and pin 19.
 ∞ Ω
Go to step 5		 Repair wiring.
→ End
5 Check function of 'switch panel (child-lock button)'
  • Measure resistance at the switch between pins 14 and 11.
 'Not actuated'
∞ Ω
'Actuated'
> 5 Ω
Go to step 7		 Go to step 6
6 Replace 'switch panel (child-lock button)' → End
7 Replace driver's door control module → End
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