For 1990-2009 cars only
| • | Check condition of circuit breaker #22. If circuit breaker is open, locate and repair cause of overload. Replace circuit breaker if necessary. |
| • | Check that G105 is clean and tight. |
| • | Refer to Cell 117 (Interior Lamps-Dimming) to diagnose heated mirror switch backlighting. |
| • | Check for a broken, or partially broken wire inside the insulation which could cause system malfunction but prove good in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load). |
| • | Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems. Refer to Checking Aftermarket Accessories . |
