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Fault code 1706: 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.
WORK INSTRUCTION CHART

Work instruction Display OK If not OK
1 Check status of 'mirror adjustment selection switch'
  • Use the 9588 Porsche System Tester II to switch to the menu 'Input signals/Mirror adjustment switch (selection)'.
  • Press the switch in all possible positions.
 Status of 'mirror adjustment selection switch' stays in one of the following positions:
'Left'
'Right'
'Fold out'
Go to step 2
Status of 'mirror adjustment selection switch' in at least one position changes to:
'Implausible signal'
Go to step 5
Status of 'mirror adjustment selection switch' (switch not pressed) is:
'Implausible signal'
Go to step 2
Status of 'mirror adjustment selection switch' changes according to switch actuation:
'Left'
'Right'
'Fold out'
Go to step 8
2 Check mirror adjustment selection switch
  • Pull plug off 'mirror adjustment selection switch'.
 Status of 'mirror adjustment selection switch' changes to:
'Not actuated'
Go to step 7		 Go to step 3
3 Check wire from driver's door control module to mirror adjustment selection switch for short circuit to ground
  • Switch off ignition.
  • Pull plug A off driver's door control module.
  • Measure resistance between control module plug A pin 24 and ground.
 ∞ Ω
Go to step 4		 Repair wiring.
→ End
4 Check for short circuit between wires from driver's door control module to mirror adjustment selection switch
  • Measure resistance between pins 24 and 17 of control module plug A.
 ∞ Ω
Go to step 8		 Repair wiring.
→ End
5 Check operation of mirror adjustment selection switch
  • Switch off ignition.
  • Pull plug off mirror adjustment selection switch.
  • Measure resistance between pin 8 and pin 10 on mirror adjustment selection switch socket.
  • Actuate mirror adjustment selection switch in all possible positions.
 'Not actuated'
∞ Ω
'Left'
670 to 690 Ω
'Right'
1,470 to 1,530 Ω
'Fold out'
110 to 130 Ω
Go to step 6		 Go to step 7
6 Check wire from driver's door control module to mirror adjustment selection switch for continuity
  • Measure resistance between pin 24 of control module plug A and pin 10 of mirror adjustment selection switch plug.
  • Measure resistance between pin 17 of control module plug A and pin 8 of mirror adjustment selection switch plug.
 < 5 Ω
Go to step 8		 Repair wiring.
→ End
7 Replace mirror adjustment selection switch → End
8 Replace driver's door control module → End
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