Jeep Grand Cherokee WK. Manual — part 1678

42–REAR MODE OVERCURRENT (MTC) (CONTINUED)

8.

CHECK THE FRONT MODE DOOR ACTUATOR CIRCUIT RESISTANCE

Measure the resistance between the (C66) Front Mode Door Common
Driver Circuit and the (C266) Front Mode Door Driver circuit in the A/C
Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

>> Go To 9

No

>> Go To 10

9.

CHECK THE (C66) FRONT MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C266)
FRONT MODE DOOR DRIVER CIRCUIT

Disconnect the Front Mode Door Actuator harness connector.

Measure the resistance between the (C66) Front Mode Door Common
Driver Circuit and the (C266) Front Mode Door Driver circuit in the A/C
Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

>> Repair the (C66) Front Mode Door Common Driver Circuit

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

>> Replace the Front Mode Door Actuator in accordance with

the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

24 - 60

HVAC - ELECTRICAL DIAGNOSTICS

WK

42–REAR MODE OVERCURRENT (MTC) (CONTINUED)

10.

CHECK THE REAR MODE DOOR ACTUATOR CIRCUIT RESISTANCE

Measure the resistance between the (C939) Rear Mode Door Com-
mon Driver Circuit and the (C139) Rear Mode Door Driver circuit in the
A/C Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

>> Go To 11

No

>> Go To 12

11.

CHECK THE (C939) REAR MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C139)
REAR MODE DOOR DRIVER CIRCUIT

Disconnect the Rear Mode Door Actuator harness connector.

Measure the resistance between the (C939) Rear Mode Door Com-
mon Driver Circuit and the (C139) Rear Mode Door Driver circuit in the
A/C Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

>> Repair the (C939) Rear Mode Door Common Driver Circuit

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

>> Replace the Rear Mode Door Actuator in accordance with

the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

WK

HVAC - ELECTRICAL DIAGNOSTICS

24 - 61

42–REAR MODE OVERCURRENT (MTC) (CONTINUED)

12.

CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE

Measure the resistance between the (C55) Left Blend Door Common
Driver Circuit and the (C255) Left Blend Door Driver circuit in the A/C
Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

>> Go To 13

No

>> Go To 14

13.

CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255)
LEFT BLEND DOOR DRIVER CIRCUIT

Disconnect the Left Blend Door Actuator harness connector.

Measure the resistance between the (C55) Left Blend Door Common
Driver Circuit and the (C255) Left Blend Door Driver circuit in the A/C
Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

>> Repair the (C55) Left Blend Door Common Driver Circuit

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

>> Replace the Left Blend Door Actuator in accordance with

the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

24 - 62

HVAC - ELECTRICAL DIAGNOSTICS

WK

42–REAR MODE OVERCURRENT (MTC) (CONTINUED)

14.

CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE

Measure the resistance between the (C68) Recirculation Door Com-
mon Driver Circuit and the (C268) Recirculation Door Driver circuit in
the A/C Heater Control C2 harness connector.

Is the resistance below 30.0 ohms?

Yes

>> Go To 15

No

>> Go To 16

15.

CHECK THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268)
RECIRCULATION DOOR DRIVER CIRCUIT

Disconnect the Recirculation Door Actuator harness connector.

Measure the resistance between the (C68) Recirculation Door Com-
mon Driver Circuit and the (C268) Recirculation Door Driver circuit in
the A/C Heater Control C2 harness connector.

Is the resistance below 10k ohms?

Yes

>> Repair the (C68) Recirculation Door Common Driver Cir-

cuit for a short to the (C268) Recirculation Door Driver cir-
cuit.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

No

>> Replace the Recirculation Door Actuator in accordance

with the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

WK

HVAC - ELECTRICAL DIAGNOSTICS

24 - 63