Chrysler Pacifica. Manual — part 132
Symptom List:
A/C SWITCH FAULT (ACTIVE) - MTC
CHECKSUM FAILURE (ACTIVE) - MTC
DEFOG SWITCH FAULT (ACTIVE) - MTC
LOOPBACK TEST FAILURE (ACTIVE) - MTC
POWER SWITCH FAULT (ACTIVE) - MTC
RECIRC SWITCH FAULT (ACTIVE) - MTC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be A/C SWITCH FAULT (ACTIVE) -
MTC.
When Monitored and Set Condition:
A/C SWITCH FAULT (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C mode switch stays closed for 10 minutes.
CHECKSUM FAILURE (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the calculated check sum does not match the stored
value.
DEFOG SWITCH FAULT (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the EBL mode switch stays closed for 10 minutes.
LOOPBACK TEST FAILURE (ACTIVE) - MTC
When Monitored:
When the A/C Heater Control executes an internal loopback test.
Set Condition:
If the A/C Heater Control either fails to broadcast a message on the PCI
Bus or fails to receive expected messages from the PCI Bus for 5 seconds it will execute an
internal loopback test. This DTC will set if the internal loopback test fails.
POWER SWITCH FAULT (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the Power switch stays closed for 10 minutes.
RECIRC SWITCH FAULT (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the Recirc mode switch stays closed for 10 minutes.
525
HEATING & A/C
POSSIBLE CAUSES
A/C HEATER CONTROL
TEST
ACTION
APPLICABILITY
1
View repair
All
Repair
Replace the A/C Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
526
HEATING & A/C
A/C SWITCH FAULT (ACTIVE) - MTC —
Continued
Symptom List:
A/C SWITCH FAULT (STORED) - MTC
BACKLIGHT DIMMING RX FAILURE (STORED) - MTC
BLEND OVERCURRENT (STORED) - MTC
CHECKSUM FAILURE (STORED) - MTC
DEFOG SWITCH FAULT (STORED) - MTC
EVAPORATOR
TEMPERATURE
SENSOR
CIRCUIT
OPEN
(STORED) - MTC
EVAPORATOR
TEMPERATURE
SENSOR
CIRCUIT
SHORT
(STORED) - MTC
LOOPBACK TEST FAILURE (STORED) - MTC
MODE OVERCURRENT (STORED) - MTC
NO FUEL LEVEL MESSAGE RECEIVED (STORED) - MTC
PCM COMMUNICATION FAILURE (STORED) - MTC
POWER SWITCH FAULT (STORED) - MTC
RECIRC OVERCURRENT (STORED) - MTC
RECIRC SWITCH FAULT (STORED) - MTC
TX FAILURE (STORED) - MTC
VEHICLE ODOMETER FAILURE (STORED) - MTC
ZONE OVERCURRENT (STORED) - MTC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be A/C SWITCH FAULT (STORED) -
MTC.
When Monitored and Set Condition:
A/C SWITCH FAULT (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C mode switch stays closed for 10 minutes.
BACKLIGHT DIMMING RX FAILURE (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
If the A/C Heater Control does not receive the dimming function message
from the Body Control Module (BCM) for more than 5 seconds, then the mode switch status
indicators on the A/C Heater Control will default to daytime brightness and the DTC will
set.
BLEND OVERCURRENT (STORED) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C Heater Control 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.
527
HEATING & A/C
CHECKSUM FAILURE (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the calculated check sum does not match the stored
value.
DEFOG SWITCH FAULT (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the EBL mode switch stays closed for 10 minutes.
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C Heater Control senses abnormally high
voltage on the Evaporator Temperature Sensor Signal circuit.
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C Heater Control senses abnormally low voltage
on the Evaporator Temperature Sensor Signal circuit.
LOOPBACK TEST FAILURE (STORED) - MTC
When Monitored:
When the A/C Heater Control executes an internal loopback test.
Set Condition:
If the A/C Heater Control either fails to broadcast a message on the PCI
Bus or fails to receive expected messages from the PCI Bus for 5 seconds it will execute an
internal loopback test. This DTC will set if the internal loopback test fails.
MODE OVERCURRENT (STORED) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C Heater Control 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.
NO FUEL LEVEL MESSAGE RECEIVED (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C Heater Control does not receive the Fuel Level
message from the Powertrain Control Module (PCM) for more than 5 seconds.
PCM COMMUNICATION FAILURE (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C Heater Control does not receive the Fuel
message from the Powertrain Control Module (PCM) for more than 5 seconds.
528
HEATING & A/C
A/C SWITCH FAULT (STORED) - MTC —
Continued
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