Backlight Dimming Rx Failure (Active) - Dodge ZB 2005 Service Manual

HEATING & A/C
Symptom:

BACKLIGHT DIMMING RX FAILURE (ACTIVE)

When Monitored and Set Condition:
BACKLIGHT DIMMING RX FAILURE (ACTIVE)
When Monitored: With the ignition on.
Set Condition: If the A/C - Heater Control Module does not receive the dimming function
message from the Body Control Module for more than 5 seconds, then the A/C - Heater
Control Module backlighting will default to full brightness and the DTC will set.
DIMMING MESSAGE NOT SEEN AT RATE EXPECTED
A/C - HEATER CONTROL MODULE
BODY CONTROL MODULE - NO DIM MESSAGE TO A/C - HEATER CONTROL MODULE
TEST
1 NOTE: Make sure that the Panel Dimmer switch is not in set in Funeral
Mode.
Turn the ignition on.
Turn the Blower control to low speed.
Press the A/C switch on.
Press the EBL switch on.
Watch the A/C and EBL status indicators on the A/C-Heater Control Module while
turning the Headlamp switch on and then off.
Did the status indicators dim when the Headlamp switch was turned on?
Yes → No problem found at this time.
No
2 Turn the ignition on.
With the DRBIII in Monitor Display, PCI Bus Messages, look for the VF DIM Msg
Present.
Does the DRB display: VF DIM Msg present: Yes?
Yes → Replace the A/C - Heater Control Module in accordance with the
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
→ Go To 2
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
→ Replace the Body Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
214
APPLICABILITY
All
All