Dodge Ram. Manual — part 94
TEST
ACTION
APPLICABILITY
11
Turn the ignition off.
Ensure that the A/C - Heater Control C1 harness connector is connected to the A/C
- Heater Control Module.
Turn the ignition on.
With the DRBIII
t in HVAC, System Tests, actuate the Actuator Circuit Test.
What message does the DRBIII
t display?
All
Same msg as from start of test
Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Different msg than from start of test
Using the wiring diagram as a guide, inspect the wiring &
connectors for conditions causing an intermittent short that set
the original test msg. Repair as necessary. If DRB displays a msg
for a different door driver ckt, return to Test 1 of this Symptom.
Perform BODY VERIFICATION TEST - VER 1.
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HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE —
Continued
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 Instrument Cluster for more than 5 seconds, then the A/C - Heater
Control Module backlighting will default to full brightness and the DTC will set.
POSSIBLE CAUSES
CHECK FOR INSTRUMENT CLUSTER (MIC) DTCS
DIMMING MESSAGE NOT SEEN AT RATE EXPECTED
A/C - HEATER CONTROL MODULE
MIC - NO DIM MESSAGE TO A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t in Body, Electro/Mech Cluster (MIC), read DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to the Instrument Cluster category for the related symp-
tom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
Turn the Headlamp switch on.
Turn the Blower control to low speed.
If equipped, press the A/C switch on.
If equipped, press the EBL switch on.
If equipped, press the Max switch on.
Rotate the Cargo Dome switch in both directions while watching the A/C (if
equipped), EBL (if equipped), and MAX (if equipped) status indicators on the
A/C-Heater Control Module.
Do the status indicators dim and brighten respectively while rotating the switch?
All
Yes
→ No problem found at this time.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
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HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition on.
With the DRBIII
t in Monitor Display, PCI Bus Messages, look for the VF DIM Msg
Present.
Does the DRB display: VF DIM Msg present: Yes?
All
Yes
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Instrument Cluster in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
375
HEATING & A/C
BACKLIGHT DIMMING RX FAILURE (ACTIVE) —
Continued
Symptom List:
BLEND CALIBRATION FAULT
MODE 1 CALIBRATION FAULT
MODE 2 CALIBRATION FAULT
RECIRCULATION CALIBRATION FAULT
ZONE CALIBRATION FAULT
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be BLEND CALIBRATION FAULT.
When Monitored and Set Condition:
BLEND CALIBRATION FAULT
When Monitored:
When the HVAC Door Recalibration is executed.
Set Condition:
If the blend (single-zone) or passenger blend (dual-zone) door’s span is
found outside the tolerance due to: open door actuator electrical circuits; a bad door
actuator; broken door linkage; a bound up door; door actuator electrical circuits shorted to
voltage; door actuator electrical circuits shorted to ground. A short to voltage or ground on
the door actuator electrical circuits will also set door actuator overcurrent faults.
MODE 1 CALIBRATION FAULT
When Monitored:
When the HVAC Door Recalibration is executed.
Set Condition:
If the Mode 1 door’s span is found outside the tolerance due to: open door
actuator electrical circuits; a bad door actuator; broken door linkage; a bound up door; door
actuator electrical circuits shorted to voltage; door actuator electrical circuits shorted to
ground. A short to voltage or ground on the door actuator electrical circuits will also set
door actuator overcurrent faults.
MODE 2 CALIBRATION FAULT
When Monitored:
When the HVAC Door Recalibration is executed.
Set Condition:
If the Mode 2 door’s span is found outside the tolerance due to: open door
actuator electrical circuits; a bad door actuator; broken door linkage; a bound up door; door
actuator electrical circuits shorted to voltage; door actuator electrical circuits shorted to
ground. A short to voltage or ground on the door actuator electrical circuits will also set
door actuator overcurrent faults.
RECIRCULATION CALIBRATION FAULT
When Monitored:
When the HVAC Door Recalibration is executed.
Set Condition:
If the recirculation door’s span is found outside the tolerance due to: open
door actuator electrical circuits; a bad door actuator; broken door linkage; a bound up door;
door actuator electrical circuits shorted to voltage; door actuator electrical circuits shorted
to ground. A short to voltage or ground on the door actuator electrical circuits will also set
door actuator overcurrent faults.
376
HEATING & A/C
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