Dodge Ram. Manual — part 101
Symptom:
*A/C STATUS INDICATOR WILL NOT ILLUMINATE -- A/C - HEATER
CONTROL WITHOUT EBL SW
POSSIBLE CAUSES
HVAC DOOR RECALIBRATION FAILED
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
Does the DRBIII
t display: Recalibration Test Failed?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
401
HEATING & A/C
Symptom:
*BLEND/MODE/RECIRC DOOR OPERATION IMPROPER -- DUAL-
ZONE
POSSIBLE CAUSES
CHECK FOR ACTUATOR CIRCUIT TEST FAULT MESSAGES
CHECK FOR ACTIVE HVAC DTCS
CHECK FOR HVAC DOOR RECALIBRATION FAULT MESSAGES
MODE DOOR ACTUATOR(S)/LINKAGE(S)/DOOR(S)
PASSENGER BLEND DOOR ACTUATOR/LINKAGE/DOOR
DRIVER BLEND DOOR ACTUATOR/LINKAGE/DOOR
RECIRCULATION DOOR ACTUATOR/LINKAGE/DOOR
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 DRBIII
t in HVAC, System Tests, actuate the Actuator Circuit Test.
Does the DRBIII
t 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 DRBIII
t, read active HVAC DTCs.
Does the DRBIII
t display any active 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
NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must
be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the DRBIII
t in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
Does the DRBIII
t display any HVAC Door Recalibration fault messages?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
402
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Which door did customer ID as faulty?
All
Mode Doors
Go To
5
Passenger Blend Door
Go To
6
Driver Blend Door
Go To
7
Recirculation Door
Go To
8
5
Start the engine.
Turn the blower control to the high speed position.
NOTE: The Mode 1 door must be at its physical end of travel in the panel
position to correctly direct airflow to the Mode 2 door.
NOTE: The Mode 2 door must be at its physical end of travel in the
floor-defrost position to correctly direct airflow to the Mode 1 door.
Turn the mode control to each door position for a minimum of 30 seconds and check
for airflow from the corresponding vents.
Does air flow from the correct vents for each door position?
All
Yes
→ Test Complete.
No
→ Remove door actuators from A/C-Heater Housing Assy. By hand,
attempt to rotate the door actuators in both directions. Also,
inspect for disconnected, missing, or broken door actuator link-
age. Repair as necessary in accordance with the Service Informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
6
Start the engine.
Turn the blower control to the high speed position.
Turn the mode control to the panel position.
Move the passenger blend control to the full hot position.
Move the passenger blend control to the full cold position, in 25% increments, while
checking for a change in airflow air temperature coming from the passenger’s panel
vents.
Does the airflow air temperature change with respect to the position of the blend
control?
All
Yes
→ Test Complete.
No
→ Remove door actuator from A/C-Heater Housing Assy. By hand,
attempt to rotate the door actuator in both directions. Also,
inspect for disconnected, missing, or broken door actuator link-
age. Repair as necessary in accordance with the Service Informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
403
HEATING & A/C
*BLEND/MODE/RECIRC DOOR OPERATION IMPROPER -- DUAL-ZONE
—
Continued
TEST
ACTION
APPLICABILITY
7
Start the engine.
Turn the blower control to the high speed position.
Turn the mode control to the panel position.
Move the driver blend control to the full hot position.
Move the driver blend control to the full cold position, in 25% increments, while
checking for a change in airflow air temperature coming from the driver’s panel
vents.
Does the airflow air temperature change with respect to the position of the blend
control.
All
Yes
→ Test Complete.
No
→ Remove door actuator from A/C-Heater Housing Assy. By hand,
attempt to rotate the door actuator in both directions. Also,
inspect for disconnected, missing, or broken door actuator link-
age. Repair as necessary in accordance with the Service Informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
8
Start the engine.
Turn the blower control to the high speed position.
Press the MAX control off (LED not Illuminated).
Press the MAX control on (LED Illuminated). The sound of the air flowing through
the ducts should get louder as the recirculation door opens to bring in recirc air.
Does the sound of the airflow get louder after pressing the MAX control on?
All
Yes
→ Test Complete.
No
→ Remove door actuator from A/C-Heater Housing Assy. By hand,
attempt to rotate the door actuator in both directions. Also,
inspect for disconnected, missing, or broken door actuator link-
age. Repair as necessary in accordance with the Service Informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
404
HEATING & A/C
*BLEND/MODE/RECIRC DOOR OPERATION IMPROPER -- DUAL-ZONE
—
Continued
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