Chrysler Town, Dodge Caravan. Manual — part 823
TEST
ACTION
APPLICABILITY
8
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 9
No
→ Reconnect C1. Rerun Recalibration. If DRB displays same fault,
replace A/C-Htr Cntrl in accord with Service Info. If DRBIII
displays a different fault, ck wiring & connectors for cause of
intermittent condition. If no prob found, rerun test from Step 1.
Perform BODY VERIFICATION TEST - VER 1.
9
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Remove the applicable door actuator from the A/C - Heater Housing Assembly.
Disconnect the door actuator harness connector.
Measure the resistance of the door driver circuit between the A/C - Heater Control
Module C1 harness connector and the door actuator harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 10
No
→ Repair the door driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Remove the applicable door actuator from the A/C - Heater Housing Assembly.
Disconnect the door actuator harness connector.
Measure the resistance of the Common Door Driver circuit between the door actuator
harness connector and the A/C - Heater Control Module C1 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the door actuator in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Common Door Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
528
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
TEST
ACTION
APPLICABILITY
11
NOTE: After completing HVAC Door Recalibration, the DRBIII
t will store
the total span and the status of each door actuator. Selecting HVAC Door
Cal Monitor in System Tests will display this information.
With the DRBIII
t in HVAC, select System Tests, and then select HVAC Door Cal
Monitor.
Which message does the DRBIII
t display for R Mode Status?
All
No Pulses
Too Few Pulses
Inspect the Rear A/C - Heater Housing Assembly for a condition
causing the rear mode linkage/door to bind. Repair as necessary in
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Too Many Pulses
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Broken Linage
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
12
NOTE: After completing HVAC Door Recalibration, the DRBIII
t will store
the total span and the status of each door actuator. Selecting HVAC Door
Cal Monitor in System Tests will display this information.
With the DRBIII
t in HVAC, select System Tests, and then select HVAC Door Cal
Monitor.
Which message does the DRBIII
t display for R Blend Status?
All
No Pulses
Too Few Pulses
Inspect the Rear A/C - Heater Housing Assembly for a condition
causing the rear blend linkage/door to bind. Repair as necessary in
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Too Many Pulses
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Broken Linkage
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
529
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
TEST
ACTION
APPLICABILITY
13
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Measure the resistance between the Rear Common Door Driver circuit and the
applicable door driver circuit.
Is the resistance above 70.0 ohms?
All
Yes
→ Go To 14
No
→ Reconnect C1. Rerun Recalibration. If DRB displays same fault,
replace A/C-Htr Cntrl in accord with Service Info. If DRBIII
displays a different fault, ck wiring & connectors for cause of
intermittent condition. If no prob found, rerun test from Step 1.
Perform BODY VERIFICATION TEST - VER 1.
14
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Remove the applicable door actuator from the Rear A/C - Heater Housing Assembly.
Disconnect the door actuator harness connector.
Measure the resistance of the door driver circuit between the A/C - Heater Control
Module C1 harness connector and the door actuator harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 15
No
→ Repair the Rear Common Door Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
15
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Remove the applicable door actuator from the Rear A/C - Heater Housing Assembly.
Disconnect the door actuator harness connector.
Measure the resistance of the Rear Common Door Driver circuit between the door
actuator harness connector and the A/C - Heater Control Module C1 harness
connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the door actuator in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Rear Common Door Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
530
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
Symptom List:
BLEND OVERCURRENT (ACTIVE) - MTC
MODE OVERCURRENT (ACTIVE) - MTC
REAR BLEND OVERCURRENT (ACTIVE) - MTC
REAR MODE OVERCURRENT (ACTIVE) - MTC
RECIRC OVERCURRENT (ACTIVE) - MTC
ZONE OVERCURRENT (ACTIVE) - MTC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be BLEND OVERCURRENT (AC-
TIVE) - MTC.
When Monitored and Set Condition:
BLEND OVERCURRENT (ACTIVE) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive the passenger
blend door actuator. Only one overcurrent DTC can set per ignition cycle.
MODE OVERCURRENT (ACTIVE) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive this actuator.
Only one overcurrent DTC can set per ignition cycle.
REAR BLEND OVERCURRENT (ACTIVE) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive this actuator.
Only one overcurrent DTC can set per ignition cycle.
REAR MODE OVERCURRENT (ACTIVE) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive this actuator.
Only one overcurrent DTC can set per ignition cycle.
RECIRC OVERCURRENT (ACTIVE) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive this actuator.
Only one overcurrent DTC can set per ignition cycle.
531
HEATING & A/C
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