Test 10A: Control Head Illumination

WARNING: This page is about a different car, the 1999 Dodge Intrepid and 1999 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before proceeding with this test, perform TEST 1A: IDENTIFYING A/C-HEATER SYSTEM PROBLEMS .

Disconnect A/C-heater control head White 12-pin (C1) connector. Ensure connector terminals are clean, tight and not damaged. Repair as necessary.
Turn parking lights on. Using a DVOM, measure voltage between ground and control head 12-pin connector terminal No. 12 (Orange wire). Watch for voltage change while rotating thumb wheel from bright to dim. If voltage changes from less than 3.5 volts to more than 9.0 volts, replace control head illumination bulbs. If voltage does not change as specified, repair open in Orange wire. Perform VERIFICATION TEST .