Chrysler Pacifica. Manual — part 138
TEST
ACTION
APPLICABILITY
10
Turn the ignition off.
Disconnect the A/C Heater Control 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 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.
11
Turn the ignition off.
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the DRBIII
t in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
What message does the DRBIII
t display?
All
Same msg as from start of test
Replace the A/C Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
Different msg than from start of test
Using the wiring diagram/schematic as a guide, inspect the wiring
and connectors for conditions that caused the original test mes-
sage to set. Repair as necessary. Then, return to Test 1 of this
Symptom.
Perform BODY VERIFICATION TEST - VER 1.
No fault message
Using the wiring diagram/schematic as a guide, inspect the wiring
and connectors for conditions that caused the original test mes-
sage to set. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
549
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
Symptom List:
BLEND CIRCUIT SHORTED TO GROUND - MTC
BLEND CIRCUIT SHORTED TO IGN OR BATT - MTC
COMMON DRIVER SHORTED TO GROUND - MTC
COMMON DRIVER SHORTED TO IGN OR BATT - MTC
MODE CIRCUIT SHORTED TO GROUND - MTC
MODE CIRCUIT SHORTED TO IGN OR BATT - MTC
RECIRC CIRCUIT SHORTED TO GROUND - MTC
RECIRC CIRCUIT SHORTED TO IGN OR BATT - MTC
SHORT TOO COMPLEX - MTC
ZONE CIRCUIT SHORTED TO GROUND - MTC
ZONE CIRCUIT SHORTED TO IGN OR BATT - MTC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be BLEND CIRCUIT SHORTED TO
GROUND - MTC.
When Monitored and Set Condition:
BLEND CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short low on the
Passenger Blend Door Driver circuit.
BLEND CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short high on the
Passenger Blend Door Driver circuit.
COMMON DRIVER SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short low on the
Common Door Driver circuit.
COMMON DRIVER SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short high on the
Common Door Driver circuit.
MODE CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short low on the
Mode Door Driver circuit.
550
HEATING & A/C
MODE CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short high on the
Mode Door Driver circuit.
RECIRC CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short low on the
Recirculation Door Driver circuit.
RECIRC CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short high on the
Recirculation Door Driver circuit.
SHORT TOO COMPLEX - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects more than three
drivers shorted in the same direction (e.g., four drivers, all shorted to ground) or if two or
more drivers are shorted with at least one driver shorted to ignition/battery and one driver
shorted to ground.
ZONE CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short low on the
Driver Blend Door Driver circuit.
ZONE CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C Heater Control detects a short high on the
Driver Blend Door Driver circuit.
POSSIBLE CAUSES
DOOR DRIVER CIRCUIT SHORTED LOW
DOOR ACTUATOR SHORTED
DOOR DRIVER CIRCUIT SHORTED HIGH
A/C HEATER CONTROL
INTERMITTENT WIRING PROBLEM
DOOR DRIVER CIRCUITS SHORTED HIGH
DOOR DRIVER CIRCUITS SHORTED LOW
551
HEATING & A/C
BLEND CIRCUIT SHORTED TO GROUND - MTC —
Continued
POSSIBLE CAUSES
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR DRIVER CIRCUITS SHORTED TO COMMON DOOR DRIVER CIRCUIT
DOOR ACTUATORS SHORTED
A/C HEATER CONTROL
INTERMITTENT WIRING PROBLEM
TEST
ACTION
APPLICABILITY
1
CAUTION: To ensure a proper diagnosis, repair all Short Too Complex fault
messages first, all common door driver circuit related fault messages
second, and all other fault messages last.
CAUTION: The DRBIII
t can display up to three Actuator Circuit Test fault
messages at a time. After repairing each fault message, cycle the ignition
switch, then run the Actuator Circuit Test again to ensure no new faults
exist.
Which Actuator Circuit Test message is present?
All
XXX Driver/Ckt Short to Gnd
XXX Driver/Ckt Short to Ign or Batt
Short Too Complex
XXX Drv/Ckt Short to Gnd & to Ign or Bat
2
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between ground and the applicable door driver circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the door driver circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the Common Door Driver circuit and the applicable
door driver circuit.
Is the resistance below 30.0 ohms?
All
Yes
→ Replace the door actuator in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
552
HEATING & A/C
BLEND CIRCUIT SHORTED TO GROUND - MTC —
Continued
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