Dimmer Switch: Testing and Inspection

INSTRUMENT PANEL DIMMER SWITCH INSPECTION

1. Remove the instrument panel dimmer switch. See Service and Repair.

2. Inspect for continuity between the dimmer switch terminals using an ohmmeter.





Inspection





Component testing procedure (voltage applied)Disconnect the ohmmeter; connect pin 2 using a fused (10A) jumper to 12V DC power and pin 4 to ground. Measure the voltage between pin 2 and pin 4 while rotating the thumbwheel from full illumination to no illumination. If the voltage smoothly decreases from near 12 volts to near 0 volts, the illumination dimmer is OK.

1. If not as specified, replace the instrument panel dimmer switch.