Test Step 2 - Check The LIN BUS Circuit

Fig 1: Driver Window/Door Lock Switch C1 Connector

Courtesy of AUDI OF AMERICA, LLC

• Turn the ignition off.
• Disconnect the Driver Window/Door Lock Switch C1 connector.
• Turn the ignition on.
• Measure the voltage between the (D903) LIN Bus circuit (Cavity 3 or Cavity 6) and the (Q911) Driver Window Switch Sense Return circuit.

Is the voltage above 7.0 volts?

No 

• Go to Test Step 3 - (D903) LIN BUS CIRCUIT SHORTED TO GROUND 

Yes 

• Replace the Driver Window/Door Lock Switch. Refer to POWER WINDOW SWITCH, DRIVER DOOR or POWER WINDOW SWITCH, PASSENGER DOOR .
• Perform the Body Verification Test. Refer to BODY VERIFICATION TESTBody Exterior .