Fault code 0912: 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:

'Short circuit to ground' → The fault is detected if there is ground potential for more than five minutes on plug A, pin 4.
'Implausible signal' → This fault is detected if the resistance between pins 4 and 19 on plug A is between 360 and 470 Ω.

WORK INSTRUCTION CHART

Work instruction			Display OK	If not OK
1	Check status of 'switch for driver's power window (driver's switch module)'	Use the 9588 Porsche System Tester II to switch to the menu 'Input signals/Driver's switch module (driver's power window)'. Press the switch in all possible positions.	Status of 'switch for driver's power window (driver's switch module)' stays in one of the following positions: 'Manual up' 'Automatic up' 'Manual down' 'Automatic down' Go to step 2
			Status of at least one position of 'switch for driver's power window (driver's switch module)' changes to: 'Implausible signal' Go to step 5
			Status of 'switch for driver's power window (driver's switch module)' (switch not pressed) is: 'Implausible signal' Go to step 2
			Status of 'switch for driver's power window (driver's switch module)' changes according to switch actuation: 'Manual up' 'Automatic up' 'Manual down' 'Automatic down' Go to step 8
2	Check switch panel (driver's power window)	Pull plug off the 'switch panel'.	Status of 'switch for driver's power window (driver's switch module)' changes to: 'Not actuated' Go to step 7	Go to step 3
3	Check wiring from driver's door control module to switch panel 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 4 and ground.	∞ Ω Go to step 4	Repair wiring. → End
4	Check wiring from driver's door control module to switch panel for short circuit	Measure resistance between pin 4 and pin 19 of control module plug A.	∞ Ω Go to step 8	Repair wiring. → End
5	Check operation of switch for driver's power window (driver's switch module)	Pull off plug on switch for driver's power window (driver's switch module). Measure resistance at the switch panel between pins 11 and 6. Press the switch in all possible positions.	'Not actuated' ∞ Ω 'Manual up' 1750 to 1800 Ω 'Automatic up' 530 to 550 Ω 'Manual down' 150 to 170 Ω 'Automatic down' > 5 Ω Go to step 6	Go to step 7
6	Check wiring from driver's door control module to switch panel for continuity	Measure resistance between pin 4 of control module plug A and pin 6 of plug on switch panel. Measure resistance between pin 19 of control module plug A and pin 11 of plug on switch panel.	< 5 Ω Go to step 8	Repair wiring. → End
7	Replace driver's power window switch module in driver's door		→ End
8	Replace driver's door control module		→ End