Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2318
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control looses communication with the Passenger Door Module (PDM).
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0208–LOST COMMUNICATION WITH HEATED SEAT CONTROL MODULE (ATC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control looses communication with the Heated Seat Module (HSM).
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0209–LOST COMMUNICATION WITH MEMORY SEAT CONTROL MODULE (ATC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control looses communication with the Memory Seat Module (MSM).
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0212–LOST COMMUNICATION WITH SCCM - CAN-B (ATC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control looses communication with the Steering Column Control Module (SCCM).
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0231–LOST COMMUNICATION WITH RAIN SENSING MODULE (ATC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control looses communication with the Rain Sensing Module (RSM).
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
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*A/C HEATER CONTROL WILL NOT ENTER DIAGNOSTIC MODE (MTC)
For a complete wiring diagram Refer to Section 8W.
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HVAC - ELECTRICAL DIAGNOSTICS
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Theory of Operation
An active DTC 33 will prevent the control from entering diagnostic mode and performing certain diagnostic functions,
it will also prevent proper A/C mode switch and status indicator function. An active DTC 34 will prevent the control
from performing certain diagnostic functions and it will prevent proper EBL mode switch and status indicator func-
tion. In addition, a short or an open (C41) Blower Switch Position Signal circuit will also prevent the control from
entering diagnostic mode. For additional information about the A/C Heater Control’s on-board diagnostics, refer to
24 - HEATING & AIR CONDITIONING - DIAGNOSIS AND TESTING.
Possible Causes
OBJECT HOLDING A/C MODE SWITCH / EBL MODE SWITCH IN A PUSHED POSITION
SUBSTANCE CAUSING A/C MODE SWITCH / EBL MODE SWITCH TO GET STUCK IN A PUSHED POSITION
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO VOLTAGE
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (Z908) GROUND CIRCUIT
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (Z909) GROUND CIRCUIT
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO GROUND
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT OPEN
A/C STATUS INDICATOR / EBL STATUS INDICATOR INOPERATIVE
A/C HEATER CONTROL
Diagnostic Test
1.
INSPECT THE A/C HEATER CONTROL FOR DAMAGE
Turn the ignition off.
Inspect the A/C Heater Control for damage.
Is the A/C Heater Control damaged?
Yes
>> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 2
2.
INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH OR EBL MODE SWITCH TO
STAY OR STICK IN A PUSHED POSITION
Inspect the A/C Heater Control for anything that would cause the A/C mode switch or the EBL mode switch to stay
or stick in a pushed position.
Is anything present that would cause the A/C mode switch or EBL mode switch to stay or stick in a
pushed position?
Yes
>> Repair as necessary.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 3
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3.
CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT VOLTAGE
Disconnect the A/C Heater Control C3 harness connector.
Turn the ignition on.
Measure the voltage of the (C850) Blower Switch Position Signal circuit.
What is the voltage?
Below 4.8 Volts
Go To 4
Above 5.2 Volts
Go To 8
4.8 Volts To 5.2 Volts
Go To 9
4.
CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z908)
GROUND CIRCUIT
Turn the ignition off.
Measure the resistance between the (C850) Blower Switch Position Sig-
nal circuit and the (Z908) Ground circuit in the A/C Heater Control C3
harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (C850) Blower Switch Position Signal circuit for a
short to the (Z908) Ground circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 5
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