Content .. 2263 2264 2265 2266 ..
Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 2265
Theory of Operation
NOTE: This DTC will display as active if the ignition is not cycled after running the Actuator Circuit Test /
Door Calibration Function. Otherwise, it will display as stored until cleared.
By running the Actuator Circuit Test / Door Calibration Function, the A/C Heater Control can identify up to
three door driver circuits shorted simultaneously. A DTC 72 will set if more than three door driver circuits
are shorted in the same direction (e.g. four door driver circuits all shorted to ground) or if two or more door
driver circuits are shorted with at least one door driver circuit shorted to ignition and one door driver circuit
shorted to ground. To ensure a proper diagnosis, diagnose and repair Actuator Circuit Test faults in the
following order: If present, diagnose and repair DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68,
or 71, and finally DTCs 63, 67, or 69. In addition, always test the door driver circuits after each repair by
clearing DTCs, and then running the Actuator Circuit Test / Door Calibration Function, and then checking for
DTCs.
•
When Monitored:
When running the Actuator Circuit Test / Door Calibration Function.
•
Set Condition:
If the A/C Heater Control detects a short to ground on the (C66) Mode Door Common Driver circuit / (C55) Left
Blend Door Common Driver circuit / (C68) Recirculation Door Common Driver circuit.
Possible Causes
(C66) MODE DOOR COMMON DRIVER CIRCUIT / (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT /
(C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT SHORTED TO GROUND
(C66) MODE DOOR COMMON DRIVER CIRCUIT / (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT /
(C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT SHORTED TO OTHER DOOR DRIVER
CIRCUIT(S)
MODE DOOR ACTUATOR
LEFT BLEND DOOR ACTUATOR
RECIRCULATION DOOR ACTUATOR
A/C HEATER CONTROL
Diagnostic Test
1.
CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON
DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO
GROUND
Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Measure the resistance of the (C66) Mode Door Common Driver Circuit,
the (C55) Left Blend Door Common Driver circuit, and the (C68) Recir-
culation Door Common Driver circuit between ground and the A/C
Heater Control C2 harness connector.
Is the resistance below 10k ohms on any of the circuits?
Yes
>> Repair all circuits with a resistance below 10k ohms for a
short to ground.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 2
24 - 94
HVAC - ELECTRICAL DIAGNOSTICS
LX