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Front A/C Heater Control Illumination Inoperative

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition on. With the DRBIII®, read HVAC DTCs. If the DRBIII® displays any HVAC DTCs, return to the symptom list and choose the symptom(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If the DRBIII® did not display any HVAC DTCs, go to the next step.
  2. Turn the ignition on. With the DRBIII®, read the BCM DTCs. If DRBIII® displays Headlamp Switch: Mismatch; STG; Open; or Panel Dim Output Short, refer to appropriate symptom. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If DRBIII® did not display Headlamp Switch: Mismatch; STG; Open; or Panel Dim Output Short, go to the next step.
  3. Turn the ignition off. Rotate the Panel Lamps Dimmer switch to the off position. Disconnect the A/C-Heater Control C1 harness connector. See Figure. Turn the Headlamp switch on. Measure the voltage of the Panel Lamps Driver circuit while rotating the Panel Lamps Dimmer switch from the off position to the full brightness position. If the voltage changes from approximately 2.5 volts to 11.5 volts, replace the A/C-Heater Control Module. See A/C-HEATER CONTROL PANEL  under REMOVAL & INSTALLATION. If the voltage did not change from approximately 2.5 volts to 11.5 volts, go to the next step.
  4. Turn the ignition off. Disconnect the A/C-Heater Control C1 harness connector. See Figure. Disconnect the Body Control Module C4 harness connector. See Figure. Measure the resistance of the Panel Lamps Driver circuit between the A/C-Heater Control C1 harness connector and the Body Control Module C4 harness connector. If the resistance is less than 5 ohms, replace the Body Control Module. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If the resistance is more than 5 ohms, repair the Panel Lamps Driver circuit for an open.
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