Chrysler Pacifica. Manual — part 148
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit (HVAC side).
Is the resistance above 10K ohms?
All
Yes
→ Replace the A/C Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the A/C Heater Control C1 harness connector and the
in-line C202 harness connector (HVAC side) for a short to Sensor
Ground.
Perform BODY VERIFICATION TEST - VER 1.
589
HEATING & A/C
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (ACTIVE) -
MTC —
Continued
Symptom:
FRONT BLOWER RELAY OPEN
When Monitored and Set Condition:
FRONT BLOWER RELAY OPEN
When Monitored:
With the ignition off.
Set Condition:
This DTC will set if the Integrated Power Module (IPM) detects an open
on the Front Blower Motor Relay Control circuit. This condition must be present for a least
one second.
POSSIBLE CAUSES
B+ CIRCUIT OPEN
FRONT BLOWER RELAY
INTEGRATED POWER MODULE (IPM)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Remove the Front Blower Relay from the IPM.
Using a 12-volt test light connected to ground, probe cavity 85 of the blower relay
connector.
Is the test light illuminated?
All
Yes
→ Go To 2
No
→ Check the B+ feed to the Integrated Power Module (IPM) for an
open. If OK, replace the IPM in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Install a substitute relay in place of the existing Front Blower Relay.
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Turn the ignition off.
With the DRBIII
t, read IPM DTCs.
Does the DRBIII
t display: FRONT BLOWER RELAY OPEN?
All
Yes
→ Replace the Integrated Power Module (IPM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the original Front Blower Relay in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
590
HEATING & A/C
Symptom:
FRONT BLOWER RELAY SHORT TO BATT
When Monitored and Set Condition:
FRONT BLOWER RELAY SHORT TO BATT
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the Integrated Power Module (IPM) detects excessive
current when attempting to close the Front Blower Motor Relay. This condition must be
present for a least one second.
POSSIBLE CAUSES
FRONT BLOWER RELAY
INTEGRATED POWER MODULE (IPM)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Install a substitute relay in place of the existing Front Blower Relay.
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Turn the ignition off, wait 30 seconds, then turn the ignition on.
With the DRBIII
t, read IPM DTCs.
Does the DRBIII
t display: FRONT BLOWER RELAY SHORT TO BATT
All
Yes
→ Replace the Integrated Power Module (IPM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the original Front Blower Relay in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
591
HEATING & A/C
Symptom:
FRONT MODE DOOR TRAVEL TOO SMALL (ACTIVE) - ATC
When Monitored and Set Condition:
FRONT MODE DOOR TRAVEL TOO SMALL (ACTIVE) - ATC
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
The Automatic Temperature Control (ATC) monitors the door’s range of
travel during system initialization. If the measured range is less than expected, the DTC
will set.
POSSIBLE CAUSES
FRONT MODE DOOR NOT RESPONDING DTC SET
AUTOMATIC TEMPERATURE CONTROL (ATC)
FRONT MODE DOOR OBSTRUCTED
FRONT MODE DOOR ACTUATOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the active ATC DTCs.
Does the DRBIII
t display: FRONT MODE DOOR NOT RESPONDING?
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 off.
Disconnect the Front Mode Door Actuator harness connector.
Connect a 12-volt Test Light between the Front Mode Door Actuator harness
connector cavities.
Turn the ignition on.
While monitoring the test light, press the MODE switch to place the mode door in
each position.
NOTE: Observe test light for approximately 30 seconds.
Does the test light start to flash and stay flashing?
All
Yes
→ Go To 3
No
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
592
HEATING & A/C
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