Diagnostic Procedure
A/C HEATER CONTROL ILLUMINATION INOPERATIVE - MTC SYMPTOM CHART
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the ignition on. With the DRBIII®, read active HVAC DTCs. Does the DRBIII® display any DTCs? Yes --> Return to the Heating & A/C symptom list and choose the symptom(s). Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 2 |
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| 2 | Turn the ignition on. With the DRBIII®, read Instrument Cluster DTCs. Does DRBIII® display any DTCs? Yes --> Refer to the INSTRUMENT CLUSTER category for the related symptom(s). Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 3 |
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| 3 | Turn the ignition off. Rotate the Panel Lamps Dimmer switch to the off position. Disconnect the A/C Heater Control C1 harness connector. Turn the park lamps 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. Does the voltage change from approximately 4.5 volts to 11.5 volts? Yes --> Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 4 |
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| 4 | Turn the ignition off. Disconnect the A/C Heater Control C1 harness connector. Disconnect the Instrument Cluster C1 harness connector. Measure the resistance of the Panel Lamps Driver circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C1 harness connector. Is the resistance below 5.0 ohms? Yes --> Replace the Instrument Cluster (EMIC) in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Panel Lamps Driver circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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