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
24 - 172
HVAC - ELECTRICAL DIAGNOSTICS
WK