Dodge Ram 2004 - Page 391

ZONE CALIBRATION FAULT
When Monitored: When the HVAC Door Recalibration is executed.
Set Condition: If the driver 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.
POSSIBLE CAUSES
CHECK FOR ACTUATOR CIRCUIT TEST FAULT MESSAGES
CHECK FOR HVAC DTCS
DOOR ACTUATOR DRIVER CIRCUIT OPEN
COMMON DOOR DRIVER CIRCUIT OPEN
DOOR ACTUATOR
DOOR ACTUATOR/LINKAGE/DOOR
A/C - HEATER CONTROL MODULE
TEST ACTION APPLICABILITY
1 NOTE:All Actuator Circuit Test fault messages and Overcurrent DTCs must
be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the DRBIIIt in HVAC, System Tests, actuate the Actuator Circuit Test.
Does the DRBIIIt display any Actuator Circuit Test fault messages?
All
Yes → Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 2
2 NOTE:All Actuator Circuit Test fault messages and Overcurrent DTCs must
be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the DRBIIIt, read HVAC DTCs.
Does the DRBIIIt display any HVAC DTCs?
All
Yes → Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 3
3 Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Measure the resistance between the Common Door Driver circuit and the applicable
door driver circuit.
Is the resistance above 70.0 ohms?
All
Yes → Go To 4
No → Go To 6
377
HEATING & A/C
BLEND CALIBRATION FAULT — Continued