Jeep Grand Cherokee WK. Manual — part 1716
B10AC–RIGHT BLEND DOOR CONTROL CIRCUIT OPEN (ATC)
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B10AC–RIGHT BLEND DOOR CONTROL CIRCUIT OPEN (ATC) (CONTINUED)
For the Automatic Temperature Control (ATC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING -
SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the (C61) Right Blend Door Driver circuit or the (C161) Right Blend Door Common Driver circuit is open.
Possible Causes
(C61) RIGHT BLEND DOOR DRIVER CIRCUIT OPEN
(C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT OPEN
RIGHT BLEND DOOR ACTUATOR
A/C HEATER CONTROL
Diagnostic Test
1.
CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs
Turn the ignition on.
With the scan tool, read active HVAC DTCs.
Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE DTCs?
Yes
>> Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of all
HVAC related symptoms.
No
>> Go To 2
2.
CHECK THE RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Measure the resistance between the (C61) Right Blend Door Driver
circuit and the (C161) Right Blend Door Common Driver circuit in the
A/C Heater Control C2 harness connector.
Is the resistance above 70.0 ohms?
Yes
>> Go To 3
No
>> 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).
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HVAC - ELECTRICAL DIAGNOSTICS
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B10AC–RIGHT BLEND DOOR CONTROL CIRCUIT OPEN (ATC) (CONTINUED)
3.
CHECK THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT FOR AN OPEN
Disconnect the Right Blend Door Actuator harness connector.
Measure the resistance of the (C61) Right Blend Door Driver circuit
between the Right Blend Door Actuator harness connector and the A/C
Heater Control C2 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the (C61) Right Blend Door Driver circuit for an
open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
4.
CHECK THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C161) Right Blend Door Common
Driver circuit between the Right Blend Door Actuator harness connec-
tor and the A/C Heater Control C2 harness connector.
Is the resistance below 5.0 ohms?
No
>> Replace the Right Blend Door Actuator in accordance with
the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
Yes
>> Repair the (C161) Right Blend Door Common Driver circuit
for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B10AD–RIGHT BLEND DOOR TRAVEL RANGE TOO SMALL (ATC)
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The A/C Heater Control calibrates each actuator individually. Automatic calibration occurs upon power up after
installing a new A/C Heater Control. Manual calibration occurs by sending a command with the scan tool. The pur-
pose of actuator calibration is to determine the total span of door travel between physical stops. To calibrate the
actuator, the A/C Heater Control first moves the door to its soft stop, and then counts the number of pulses it takes
to move the door to its other stop. An expected range of span is stored in the control’s memory. If the measured
calibration value is less than the expected range for this actuator, this DTC will set. Note that the control clears all
stored calibration faults at the beginning of the calibration procedure.
•
When Monitored:
During actuator calibration.
•
Set Condition:
If the total span of the Right Blend Door is less than the low range limit.
Possible Causes
DOOR DRIVER ELECTRICAL CIRCUIT(S)
RIGHT BLEND DOOR SEIZED, BINDING, OBSTRUCTED
RIGHT BLEND DOOR ACTUATOR
A/C HEATER CONTROL
Diagnostic Test
1.
CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs
Turn the ignition on.
With the scan tool, read active HVAC DTCs.
Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIR-
CUIT OPEN DTCs?
Yes
>> Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs
before diagnosing Control Circuit Open DTCs. Refer to the Table of Contents in this Section for a com-
plete list of all HVAC related symptoms.
No
>> Go To 2
2.
RUN THE ACTUATOR DTC DETECTION TEST
With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is com-
plete, select View DTCs.
Does the scan tool display any DTCs?
Yes
>> Diagnose and repair the DTC(s). If multiple DTCs are present, diagnose and repair all short high DTCs
first, all short low DTCs second, and all open DTCs last. Refer to the Table of Contents in this Section
for a complete list of all HVAC related symptoms.
No
>> Go To 3
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HVAC - ELECTRICAL DIAGNOSTICS
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