Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2275
73–AC REQUEST OUTPUT SIGNAL TOO HIGH (MTC)
For a complete wiring diagram Refer to Section 8W.
24 - 134
HVAC - ELECTRICAL DIAGNOSTICS
LX
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control detects voltage above 4.49 volts on the (C105) HVAC MUX Control circuit.
Possible Causes
(C105) HVAC MUX CONTROL CIRCUIT SHORTED TO VOLTAGE
INSTRUMENT CLUSTER (CCN)
A/C HEATER CONTROL
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 (MTC) for stored DTC test procedures.
Diagnostic Test
1.
CHECK (C105) HVAC MUX CONTROL CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS
CONNECTOR
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C105) HVAC MUX Control circuit.
Is the voltage above 5.2 volts?
Yes
>> Go To 2
No
>> Replace the A/C Heater Control in accordance with the Ser-
vice Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
2.
CHECK (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Turn the ignition on.
Measure the voltage of the (C105) HVAC MUX Control circuit.
Is the voltage above 0.2 volts?
Yes
>> Repair the (C105) HVAC MUX Control circuit for a short to
voltage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Replace the Instrument Cluster (CCN) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 135
74–AC REQUEST OUTPUT SIGNAL TOO LOW (MTC)
For a complete wiring diagram Refer to Section 8W.
24 - 136
HVAC - ELECTRICAL DIAGNOSTICS
LX
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control detects voltage below 1.51 volts on the (C105) HVAC MUX Control circuit.
Possible Causes
(C105) HVAC MUX CONTROL CIRCUIT SHORTED TO GROUND
(C105) HVAC MUX CONTROL CIRCUIT OPEN
INSTRUMENT CLUSTER (CCN)
A/C HEATER CONTROL
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 (MTC) for stored DTC test procedures.
Diagnostic Test
1.
CHECK (C105) HVAC MUX CONTROL CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS
CONNECTOR
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C105) HVAC MUX Control circuit.
Is the voltage below 4.8 volts?
Yes
>> Go To 2
No
>> Replace the A/C Heater Control in accordance with the Ser-
vice Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
2.
CHECK (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Measure the resistance of the (C105) HVAC MUX Control circuit
between ground and the A/C Heater Control C1 harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (C105) HVAC MUX Control circuit 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 3
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 137
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