Diagnostic Procedure
BACKLIGHT DIMMING RX FAILURE (ACTIVE) SYMPTOM CHART
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the ignition on. With the DRBIII®, attempt to communicate with the Body Control Module (BCM). Was the DRBIII® able to communicate with the Body Control Module (BCM)? Yes --> Go To 2 No --> Refer to the COMMUNICATION category for the related symptom. Perform BODY VERIFICATION TEST - VER 1 . |
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| 2 | Turn the ignition on. With the DRBIII®, read Body Control Module (BCM) DTCs. Does DRBIII® display any DTCs? Yes --> Refer to the appropriate test for the related symptom(s). Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 3 |
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| 3 |
NOTE:
Make sure that the Panel Dimmer switch is not in set in Funeral Mode. Turn the ignition on.Turn the park lamps on.Press the A/C Heater Control's power switch on.Press the A/C mode switch on.Press the EBL mode switch on.Press the Recirc mode switch on.Rotate the Panel Dimmer switch in both directions while watching the mode switch status indicators on the A/C Heater Control.Do the mode switch status indicators dim & brighten respectively?Yes --> No problem found at this time.Perform BODY VERIFICATION TEST - VER 1
.No --> Go To 4 |
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| 4 | Turn the ignition on. With the DRBIII® in HVAC, select Monitor Display and then select PCI Bus Messages. From the list, select VF DIM Msg Present. Does the DRBIII display: VF DIM Msg present: Yes? Yes --> Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace and program the Body Control Module (BCM) in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . |
All |