Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2303
B1040–PANEL MODE DOOR 1 CONTROL CIRCUIT/PERFORMANCE (ATC)
For a complete wiring diagram Refer to Section 8W.
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HVAC - ELECTRICAL DIAGNOSTICS
LX
Theory of Operation
The A/C Heater Control monitors the door driver circuits during actuator operation for shorts to ground, shorts to
battery, and shorts to other door driver circuits. If detected, the A/C Heater Control reports these types of faults as
Control Circuit/Performance DTCs.
•
When Monitored:
When actuator movement is requested.
•
Set Condition:
If the A/C Heater Control detects an excessive current draw on any of the door driver circuits while attempting
to drive this door actuator.
Possible Causes
DOOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
DOOR DRIVER CIRCUIT(S) SHORTED TO GROUND
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR ACTUATOR(S)
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 (ATC) for stored DTC test procedures.
Diagnostic Test
1.
CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Turn the ignition on.
Measure the voltage of the (C266) Mode Door Driver circuit, the (C66)
Mode Door Common Driver circuit, the (C255) Left Blend Door Driver
circuit, the (C55) Left Blend Door Common Driver circuit, the (C252)
Right Blend Door Driver circuit, the (C52) Right Blend Door Common
Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68)
Recirculation Door Common Driver circuit.
Is the voltage above 0.2 volts on any of the circuits?
Yes
>> Repair all circuits with voltage above 0.2 volts 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
>> Go To 2
LX
HVAC - ELECTRICAL DIAGNOSTICS
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2.
CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance of the (C266) Mode Door Driver circuit, the
(C66) Mode Door Common Driver circuit, the (C255) Left Blend Door
Driver circuit, the (C55) Left Blend Door Common Driver circuit, the
(C252) Right Blend Door Driver circuit, the (C52) Right Blend Door
Common Driver circuit, the (C268) Recirculation Door Driver circuit, and
the (C68) Recirculation 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 3
3.
CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR
DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND
DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268)
RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER
CIRCUIT
Measure the resistance between the (C266) Mode Door Driver circuit
and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend
Door Common Driver circuit, the (C252) Right Blend Door Driver circuit,
the (C52) Right Blend Door Common Driver circuit, the (C268) Recir-
culation Door Driver circuit, and the (C68) Recirculation Door Common
Driver circuit.
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 the (C266) Mode Door Driver circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 4
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HVAC - ELECTRICAL DIAGNOSTICS
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4.
CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND
DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT
BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE
(C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON
DRIVER CIRCUIT
Measure the resistance between the (C66) Mode Door Common Driver
circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left
Blend Door Common Driver circuit, the (C252) Right Blend Door Driver
circuit, the (C52) Right Blend Door Common Driver circuit, the (C268)
Recirculation Door Driver circuit, and the (C68) Recirculation Door
Common Driver circuit.
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 the (C66) Mode Door Common Driver 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
5.
CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND
DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268)
RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER
CIRCUIT
Measure the resistance between the (C255) Left Blend Door Driver cir-
cuit and the (C252) Right Blend Door Driver circuit, the (C52) Right
Blend Door Common Driver circuit, the (C268) Recirculation Door Driver
circuit, and the (C68) Recirculation Door Common Driver circuit.
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 (C255) Left Blend Door Driver circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 6
LX
HVAC - ELECTRICAL DIAGNOSTICS
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