Chrysler Pacifica. Manual — part 140
POSSIBLE CAUSES
A/C HEATER CONTROL
INTERMITTENT WIRING PROBLEM
TEST
ACTION
APPLICABILITY
1
NOTE: All Actuator Circuit Test fault messages must be repaired before
diagnosing Overcurrent DTCs.
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 Heating & A/C symptom list and choose the
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the Recirculation Door Driver circuit and the Driver
Blend Door Driver circuit, the Passenger Blend Door Driver circuit, and the Mode
Door Driver circuit.
Measure the resistance between the Driver Blend Door Driver circuit and the
Passenger Blend Door Driver circuit and the Mode Door Driver circuit.
Measure the resistance between the Mode Door Driver circuit and the Passenger
Blend Door Driver circuit.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair the door driver circuits with a resistance below 10K ohms
for a short together.
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 Recircu-
lation Door Driver circuit, the Driver Blend Door Driver circuit, the Passenger Blend
Door Driver circuit, and the Mode Door Driver circuit.
Is the resistance below 30.0 ohms on any of the circuits?
All
Yes
→ Go To 4
No
→ Go To 5
4
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect all door actuator harness connectors whose circuit resistance was below
30.0 ohms.
Measure the resistance between the Common Door Driver circuit and each applicable
door driver circuit.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair the door driver circuits with a resistance below 10K ohms
for a short to the Common Door Driver circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace all door actuators with a resistance below 30.0 ohms in
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
557
HEATING & A/C
BLEND OVERCURRENT (ACTIVE) - MTC —
Continued
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Ensure that the A/C Heater Control C1 harness connector is connected to the A/C
Heater Control.
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 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.
558
HEATING & A/C
BLEND OVERCURRENT (ACTIVE) - MTC —
Continued
Symptom:
BLOWER NOT ON HIGH - MTC
When Monitored and Set Condition:
BLOWER NOT ON HIGH - MTC
When Monitored:
When executing the AC Cooldown Test.
Set Condition:
This message will be displayed if the blower is not operating at high speed
when executing the AC Cooldown Test.
POSSIBLE CAUSES
ACTIVE HVAC DTC(S) PRESENT
TEST SET UP CONDITIONS NOT MET
BLOWER/RELATED CIRCUITS
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read active HVAC DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom(s). After the repair is complete, erase the DTC(s), and
run the AC Cooldown Test again.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Was the Blower Control set to high speed for the entire test?
All
Yes
→ Check the blower motor and related circuits for the cause of
blower operational problems. Repair as necessary. After the
repair is complete, run the AC Cooldown Test again.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Start the engine. Set the Blower Control to high speed. With the
DRBIII
t, actuate the AC Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
559
HEATING & A/C
Symptom:
BODY STATUS MESSAGE MISSING (ACTIVE) - ATC
When Monitored and Set Condition:
BODY STATUS MESSAGE MISSING (ACTIVE) - ATC
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC will set if the Automatic Temperature Control (ATC) does not
receive the message from the Body Control Module (BCM) for more than 5 seconds. This
message provides Hood, Liftgate, Left Rear Door, and Right Rear Door Ajar status.
POSSIBLE CAUSES
NO COMMUNICATION WITH BODY CONTROL MODULE (BCM)
BODY CONTROL MODULE (BCM) DTC(S) PRESENT
AUTOMATIC TEMPERATURE CONTROL (ATC)
BODY CONTROL MODULE (BCM)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the active ATC DTCs.
Does the DRBIII
t display: NO COMMUNICATION WITH BCM?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
With the DRBIII
t, read BCM DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to the appropriate category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
560
HEATING & A/C
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