Chrysler Town, Dodge Caravan. Manual — part 818
Symptom List:
A/C SWITCH FAULT (ACTIVE) - MTC
CHECKSUM FAILURE (ACTIVE) - MTC
DEFOG SWITCH FAULT (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 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 switch stays closed for 10 minutes.
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 switch stays closed for 10 minutes.
POSSIBLE CAUSES
A/C - HEATER CONTROL MODULE
508
HEATING & A/C
TEST
ACTION
APPLICABILITY
1
View repair
All
Repair
Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
509
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
REAR BLEND OVERCURRENT (STORED) - MTC
REAR BLEND POT CIRCUIT OPEN (STORED) - MTC
REAR BLEND POT CIRCUIT SHORT (STORED) - MTC
REAR MODE OVERCURRENT (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 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 Module does not receive the dimming function
message from the BCM for more than 5 seconds, then the A/C - Heater Control Module
LEDs will default to full brightness and the DTC will set.
510
HEATING & A/C
BLEND OVERCURRENT (STORED) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module 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.
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 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 Module sees 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 Module sees abnormally low
voltage on the Evaporator Temperature Sensor Signal circuit.
LOOPBACK TEST FAILURE (STORED) - MTC
When Monitored:
When the A/C - Heater Control Module executes an internal loopback
test.
Set Condition:
If the A/C - Heater Control Module fails to send a message, or none of the
expected messages arrive for 5 seconds, an internal loopback test is executed. If the
internal loopback test fails, the DTC will set.
MODE OVERCURRENT (STORED) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module 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 Module does not receive the
Fuel Level message from the PCM for more than 5 seconds.
511
HEATING & A/C
A/C SWITCH FAULT (STORED) - MTC —
Continued
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