Preliminary Inspection
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 BMW Z3, 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW Z3, and 2001 BMW M Roadster. However, it is still accessible from the selected car via links, so may be relevant.
Verify customer's complaint. Before performing any testing, perform a visual inspection. Check system fuses. Check connectors for loose, damaged or corroded terminals. Check for damaged wiring harness. Check for damaged or binding actuator cable. If area of fault cannot be located or repaired during preliminary inspection, check self-diagnostic system. Repair as necessary.
If no problem is found, attempt diagnosis by symptom.