Lamp Out Warning System

Turn ignition to "ACC" position. Turn on low beam headlights and activate brake lights. All outside lights should work. If not, disconnect warning module. If lights now work, replace module. If outside lights still do not work, check fuses, bulbs, sockets or wiring, and repeat test.
If outside lights work properly, check if any lamp out indicators are on. If not, turn off outside lights, and disconnect both tail lights and one headlight. Turn ignition on. Turn on low beam headlights and activate brake lights. Headlight and tail light out indicators should light, indicating system is working properly.
If outside light worked properly in step 1), but indicator lights are on, turn off lights and ignition. Disconnect warning module and turn ignition and headlights on. If indicator lights go off, check voltage between ground and circuits in module connector.
Voltage should be 10-15 volts. If not, check for open circuits in connector. If indicator lights remain on with module disconnected, check for shorts between ground and circuits in module connector.