Jeep Grand Cherokee WK. Manual — part 1706
72–SHORT TOO COMPLEX (MTC) (CONTINUED)
Diagnostic Test
1.
CHECK THE (C266) FRONT MODE DOOR DRIVER CIRCUIT, (C66) FRONT MODE DOOR COMMON
DRIVER CIRCUIT, (C139) REAR MODE DOOR DRIVER CIRCUIT, (C939) REAR MODE DOOR COMMON
DRIVER CIRCUIT, (C255) LEFT BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON
DRIVER CIRCUIT, (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & (C68) RECIRCULATION DOOR
COMMON DRIVER CIRCUIT 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) Front Mode Door Driver circuit,
(C66) Front Mode Door Common Driver circuit, (C139) Rear Mode
Door Driver circuit, (C939) Rear Mode Door Common Driver circuit,
(C255) Left Blend Door Driver circuit, (C55) Left Blend Door Common
Driver circuit, (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 -
STANDARD PROCEDURE).
No
>> Go To 2
2.
CHECK THE (C266) FRONT MODE DOOR DRIVER CIRCUIT, (C66) FRONT MODE DOOR COMMON
DRIVER CIRCUIT, (C139) REAR MODE DOOR DRIVER CIRCUIT, (C939) REAR MODE DOOR COMMON
DRIVER CIRCUIT, (C255) LEFT BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON
DRIVER CIRCUIT, (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & (C68) RECIRCULATION DOOR
COMMON DRIVER CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance of the (C266) Front Mode Door Driver circuit,
(C66) Front Mode Door Common Driver circuit, (C139) Rear Mode
Door Driver circuit, (C939) Rear Mode Door Common Driver circuit,
(C255) Left Blend Door Driver circuit, (C55) Left Blend Door Common
Driver circuit, (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 -
STANDARD PROCEDURE).
No
>> Go To 3
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HVAC - ELECTRICAL DIAGNOSTICS
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72–SHORT TOO COMPLEX (MTC) (CONTINUED)
3.
CHECK THE (C266) FRONT MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C139) REAR MODE
DOOR DRIVER CIRCUIT, (C939) REAR MODE DOOR COMMON DRIVER CIRCUIT, (C255) LEFT BLEND
DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268) RECIRCULATION
DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C266) Front Mode Door Driver
circuit and the (C139) Rear Mode Door Driver circuit, (C939) Rear
Mode Door Common Driver circuit, (C255) Left Blend Door Driver cir-
cuit, (C55) Left Blend Door Common Driver circuit, (C268) Recircula-
tion Door Driver circuit, and the (C68) Recirculation Door Common
Driver circuit in 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 the (C266) Front Mode Door Driver circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 4
4.
CHECK THE (C66) FRONT MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C139)
REAR MODE DOOR DRIVER CIRCUIT, (C939) REAR MODE DOOR COMMON DRIVER CIRCUIT, (C255)
LEFT BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268)
RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER
CIRCUIT
Measure the resistance between the (C66) Front Mode Door Common
Driver circuit and the (C139) Rear Mode Door Driver circuit, (C939)
Rear Mode Door Common Driver circuit, (C255) Left Blend Door
Driver circuit, (C55) Left Blend Door Common Driver circuit, (C268)
Recirculation Door Driver circuit, and the (C68) Recirculation Door
Common Driver circuit in the A/C Heater Control C2 harness connec-
tor.
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) Front Mode Door Common Driver cir-
cuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 5
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HVAC - ELECTRICAL DIAGNOSTICS
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72–SHORT TOO COMPLEX (MTC) (CONTINUED)
5.
CHECK THE (C139) REAR MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND
DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268) RECIRCULATION
DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C139) Rear Mode Door Driver
circuit and the (C255) Left Blend Door Driver circuit, (C55) Left Blend
Door Common Driver circuit, (C268) Recirculation Door Driver circuit,
and the (C68) Recirculation Door Common Driver circuit in 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 the (C139) Rear Mode Door Driver circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 6
6.
CHECK THE (C939) REAR MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT
BLEND DOOR DRIVER CIRCUIT, (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, (C268)
RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER
CIRCUIT
Measure the resistance between the (C939) Rear Mode Door Com-
mon Driver circuit and (C255) Left Blend Door Driver circuit, (C55) Left
Blend Door Common Driver circuit, (C268) Recirculation Door Driver
circuit, and the (C68) Recirculation Door Common Driver circuit in 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 the (C939) Rear Mode Door Common Driver cir-
cuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 7
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HVAC - ELECTRICAL DIAGNOSTICS
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72–SHORT TOO COMPLEX (MTC) (CONTINUED)
7.
CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO 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 (C268) Recirculation Door Driver circuit and the (C68)
Recirculation Door Common Driver circuit in 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 the (C255) Left Blend Door Driver circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 8
8.
CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268)
RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER
CIRCUIT
Measure the resistance between the (C55) Left Blend Door Common
Driver circuit and the (C268) Recirculation Door Driver circuit and the
(C68) Recirculation Door Common Driver circuit in 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 the (C55) Left Blend Door Common Driver circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 9
WK
HVAC - ELECTRICAL DIAGNOSTICS
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