Basic Troubleshooting

WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2006 BMW M3, 2006 BMW 330Ci, 2006 BMW 325Ci, 2005 BMW M3, and 2005 BMW 330xi. However, it is still accessible from the selected car via links, so may be relevant.

Always personally verify the customer complaint.
Always verify that the complaint is truly a system malfunction.
Perform a Quick Test to determine if the vehicle systems have logged fault codes.
Call up the faulted system or appropriate test schedule to verify the correct control module is installed in the car.
Follow the Diagnostic Information System (DIS) on screen instructions and perform all tests as specified.
Use the DIS and fault symptom diagnostic procedures as trained.
Follow the appropriate test module procedures for systems that malfunction but fail to set faults in memory.