For 1990-2009 cars only
- Inspect the circuit breaker and determine the condition. If the circuit breaker is open, locate and repair the cause of the overload and replace the circuit breaker.
- Inspect G405 to make certain that it is clean and tight.
- If a single lamp does not illuminate, inspect the lamp for an open filament. Replace the lamp if required. Also inspect the lamp socket for corrosion. Clean the socket if required.
- Adjust or replace the backup lamp switch if the lamps do not turn off.
- Inspect for a broken (or partially broken) conductor inside the insulation which could cause a malfunction but prove GOOD in a system test for continuity or voltage. These circuits may be intermittent or resistive, when loaded, and if possible, should be monitored for a voltage drop when the system is placed under load.
- Inspect for proper installation of aftermarket electronic equipment which might affect the operation of other equipment.
