Chrysler Pacifica. Manual — part 157
Symptom List:
*A/C STATUS INDICATOR FLASHING - MTC
*RECIRC STATUS INDICATOR FLASHING - MTC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be *A/C STATUS INDICATOR
FLASHING - MTC.
POSSIBLE CAUSES
AC COOLDOWN TEST NEEDS TO BE RUN
HVAC DOOR RECALIBRATION NEEDS TO BE RUN
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Which status indicator is flashing on the A/C Heater Control?
All
A/C Status Indicator
RECIRC Status Indicator
2
CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
operation.
NOTE: The A/C status indicator will flash twice per second to indicate that
the AC Cooldown Test needs to be run.
NOTE: The A/C status indicator will stop flashing twice per second if either
the AC Cooldown Test returns passed, or if any button on the control is
pressed, or if the ignition is cycled and the odometer shows greater than
eight miles.
NOTE: The Power and A/C status indicators will flash alternately while the
AC Cooldown Test is running.
Start the engine.
Turn the Blower control to the high speed position.
With the DRBIII
t in HVAC, System Tests, actuate the AC Cooldown Test.
Does the DRBIII
t display: Cooldown Test Passed?
All
Yes
→ Test Complete.
No
→ Return to the Heating & A/C symptom list and choose the
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
625
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
NOTE: The RECIRC status indicator will flash twice per second to indicate
that the HVAC Door Recalibration Test needs to be run.
NOTE: The RECIRC status indicator will stop flashing twice per second if
either the HVAC Door Recalibration Test returns passed, or if any button on
the control is pressed, or if the ignition is cycled and the odometer shows
greater than eight miles.
NOTE: The Power & RECIRC status indicators will flash alternately while
the HVAC Door Recal Test runs.
With the DRBIII
t in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
Does the DRBIII
t display: Recalibration Test Passed?
All
Yes
→ Test Complete.
No
→ Return to the Heating & A/C symptom list and choose the
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
626
HEATING & A/C
*A/C STATUS INDICATOR FLASHING - MTC —
Continued
Symptom:
*AUTOMATIC TEMPERATURE CONTROL (ATC) BACK LIGHTING
INOPERATIVE
POSSIBLE CAUSES
INSTRUMENT CLUSTER DTC(S) PRESENT
BODY CONTROL MODULE (BCM) DTC(S) PRESENT
AUTOMATIC TEMPERATURE CONTROL (ATC)
INOPERATIVE BULB(S)
PANEL LAMPS DRIVER CIRCUIT OPEN
INSTRUMENT CLUSTER (EMIC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read MIC DTCs.
Does 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 2
2
Turn the ignition on.
With the DRBIII
t, read BCM DTCs.
Does 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
3
Turn the ignition off.
Rotate the Panel Lamps Dimmer switch to the off position.
Disconnect the ATC C1 harness connector.
Turn the park lamps on.
Measure the voltage of the Panel Lamps Driver circuit while rotating the Panel
Lamps Dimmer switch from the off position to the full brightness position.
Does the voltage change from approximately 4.5 volts to 11.5 volts?
All
Yes
→ Go To 4
No
→ Go To 5
4
Turn the ignition off.
Remove the inoperative bulb(s) from the Automatic Temperature Control (ATC) in
accordance with the Service Information.
Inspect the inoperative bulb(s).
Is each inoperative bulb Okay?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the inoperative bulb(s) in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
627
HEATING & A/C
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the Panel Lamps Driver circuit between the ATC C1
harness connector and the Instrument Cluster C1 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Instrument Cluster (EMIC) in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Panel Lamps Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
628
HEATING & A/C
*AUTOMATIC TEMPERATURE CONTROL (ATC) BACK LIGHTING INOP-
ERATIVE —
Continued
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