Dodge Durango (HB). Manual — part 1492
B1032–EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT HIGH (MTC) (CONTINUED)
6.
CHECK (C121) SENSOR GROUND CIRCUIT FOR AN OPEN
Measure the resistance of the (C121) Sensor Ground circuit between
the Evaporator Temperature Sensor harness connector and the in-line
C202 (HVAC SIDE) harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Evaporator Temperature Sensor in accor-
dance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the (C121) Sensor Ground circuit for an open
between the Evaporator Temperature Sensor harness con-
nector and the in-line C202 (HVAC SIDE) harness connec-
tor.
Perform BODY VERIFICATION TEST - VER 1.
HB
HVAC - ELECTRICAL DIAGNOSTICS
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B1034–INFRARED TEMPERATURE SENSOR INPUT CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the Compass Temperature Module (EOM) detects a short to ground on the (C38) Infrared Sensor Signal
circuit.
POSSIBLE CAUSES
(C83) INFRARED SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
INFRARED TEMPERATURE SENSOR
COMPASS TEMPERATURE MODULE (EOM)
Theory of Operation
The A/C Heater Control requires IR Sensor data to function in an automatic mode. The IR Sensor is hard wired to
the Compass Temperature Module (EOM). The EOM broadcasts the IR Sensor data on the Controller Area Network
(CAN) B Bus where it is received and then processed by the A/C Heater Control.
Diagnostic Test
1.
PERFORM B1034–INFRARED TEMPERATURE SENSOR INPUT CIRCUIT LOW TEST
Repair
Perform test B1034–Infrared Temperature Sensor Input Circuit Low test. (Refer to 8 - ELECTRICAL/
OVERHEAD CONSOLE - DIAGNOSIS AND TESTING).
Perform BODY VERIFICATION TEST – VER 1.
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HVAC - ELECTRICAL DIAGNOSTICS
HB
B1035–INFRARED TEMPERATURE SENSOR INPUT CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the Compass Temperature Module (EOM) detects a short high or open on the (C83) Infrared Sensor Signal
circuit.
POSSIBLE CAUSES
(C83) INFRARED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
(Z957) INFRARED SENSOR GROUND CIRCUIT OPEN
(C83) INFRARED SENSOR SIGNAL CIRCUIT OPEN
INFRARED TEMPERATURE SENSOR
COMPASS TEMPERATURE MODULE (EOM)
Theory of Operation
The A/C Heater Control requires IR Sensor data to function in an automatic mode. The IR Sensor is hard wired to
the Compass Temperature Module (EOM). The EOM broadcasts the IR Sensor data on the Controller Area Network
(CAN) B Bus where it is received and then processed by the A/C Heater Control.
Diagnostic Test
1.
PERFORM B1035–INFRARED TEMPERATURE SENSOR INPUT CIRCUIT HIGH TEST
Repair
Perform test B1035–Infrared Temperature Sensor Input Circuit High test. (Refer to 8 - ELECTRICAL/
OVERHEAD CONSOLE - DIAGNOSIS AND TESTING).
Perform BODY VERIFICATION TEST – VER 1.
HB
HVAC - ELECTRICAL DIAGNOSTICS
24 - 163
B1038–AUTO SWITCH REQUEST INPUT CIRCUIT LOW (ATC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the Auto mode switch is stuck in a pushed position for more than two minutes. This DTC has a maturing
time of two minutes and a de-maturing time of two seconds. If the DTC’s status changes from active to stored
it will stay in memory for 100 ignition cycles.
Possible Causes
OBJECT HOLDING SWITCH IN A PUSHED POSITION
A/C HEATER CONTROL
Theory of Operation
The switch input changes when the switch is pushed down. An active DTC indicates that the switch is stuck in a
pushed position. A stored DTC indicates that the switch was stuck in a pushed position for more than two minutes,
but has since returned to its normal state.
NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC
is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures.
Diagnostic Test
1.
INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION
Inspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object.
Turn the ignition on.
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and then turn the ignition on.
Wait two minutes, then with the scan tool, read HVAC DTCs.
Does the scan tool display active: B1038–AUTO SWITCH REQUEST INPUT CIRCUIT LOW?
Yes
>> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1.
No
>> Perform BODY VERIFICATION TEST – VER 1.
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HVAC - ELECTRICAL DIAGNOSTICS
HB
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