Content .. 1677 1678 1679 1680 ..

Jeep Grand Cherokee WK. Manual - part 1679

42–REAR MODE OVERCURRENT (MTC) (CONTINUED)

16.

VERIFY THAT THE FAULT IS STILL PRESENT

Reconnect the A/C Heater Control C2 harness connector.

Reconnect all of the door actuator harness connectors.

Turn the ignition on.

Actuate the Clear DTC function by performing the following:

•

Turn the blower control on.

•

Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode
switch.

•

When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simulta-
neously press the A/C mode switch and the EBL mode switch down for 5 seconds and then release the mode
switches. Stored DTCs will clear from memory in approximately two seconds.

Turn the ignition off, wait 10 seconds, and turn the ignition on.

Actuate the Actuator Circuit Test / Door Calibration Function by performing the following:

•

Turn the blower control off.

•

Press and hold the EBL mode switch down and then turn the blower control on. Continue to hold the EBL
mode switch down until the EBL status indicator begins flashing. Then, release the EBL mode switch. While
the test / function is running, the EBL status indicator will flash once per second. If the test / function passes,
the EBL status indicator will stop flashing. If the test / function fails, the A/C and EBL status indicators will flash
alternately. Allow the test / function to run to completion before proceeding.

Actuate the Display DTC function by performing the following:

•

Turn the blower control on.

•

Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode
switch.

NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and
stored DTCs when the EBL status indicator is illuminated.
Read DTCs from the A/C status indictor.

Does the A/C status indicator display DTC 42?

Yes

>> Replace the A/C Heater Control in accordance with the Service Information.

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

>> Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an inter-

mittent short that set the original fault. Repair as necessary. Then, if present, diagnose and repair all
other DTCs. Refer to the Table of Contents in this Section for a complete list of HVAC related symp-
toms.

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

24 - 64

HVAC - ELECTRICAL DIAGNOSTICS

43–BLEND OVERCURRENT (MTC)

HVAC - ELECTRICAL DIAGNOSTICS

24 - 65

43–BLEND OVERCURRENT (MTC) (CONTINUED)

For the Manual Temperature Control (MTC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING - SCHE-
MATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

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. Note that only one overcurrent DTC can set per ignition cycle.

Possible Causes

DOOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE

DOOR DRIVER CIRCUIT(S) SHORTED TO GROUND

DOOR DRIVER CIRCUITS SHORTED TOGETHER

FRONT MODE DOOR ACTUATOR

REAR MODE DOOR ACTUATOR

LEFT BLEND DOOR ACTUATOR

RECIRCULATION DOOR ACTUATOR

A/C HEATER CONTROL

NOTE: This DTC must be active for the result 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.

24 - 66

HVAC - ELECTRICAL DIAGNOSTICS

43–BLEND OVERCURRENT (MTC) (CONTINUED)

Diagnostic Test

RUN THE ACTUATOR CIRCUIT TEST / DOOR CALIBRATION FUNCTION & THEN CHECK FOR
ACTUATOR CIRCUIT TEST FAULTS

NOTE: Diagnose and repair Actuator Circuit Test faults (DTC 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, and 72)
before diagnosing Overcurrent faults (DTC 41, 42, 43, and 44).
Turn the ignition on.

Actuate the Clear DTC function by performing the following:

•

Turn the blower control on.

•

Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode
switch.

•

Turn the ignition off, wait 10 seconds, and turn the ignition on.

Actuate the Actuator Circuit Test / Door Calibration Function by performing the following:

•

Turn the blower control off.

•

Actuate the Display DTC function by performing the following:

•

Turn the blower control on.

•

Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode
switch.

Does the A/C status indicator display any of the following DTCs: 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, or
72?

Yes

>> As present, diagnose and repair the Actuator Circuit Test faults in the following order: DTC 72 first, then

DTC 62, then DTC 61, then DTCs 64, 66, 68, or 71, and finally DTCs 63, 65, 67, or 69. Refer to the
Table Of Contents in this section for a complete list of HVAC related symptoms.

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

>> Go To 2

HVAC - ELECTRICAL DIAGNOSTICS

24 - 67

Content .. 1677 1678 1679 1680 ..