Jeep Grand Cherokee WK. Manual — part 1720
B10A3–LEFT BLEND DOOR CONTROL CIRCUIT LOW (ATC) (CONTINUED)
2.
CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C255) Left Blend Door Driver cir-
cuit and the (C55) Left Blend Door Common Driver circuit in the A/C
Heater Control C2 harness connector.
Is the resistance below 30.0 ohms?
Yes
>> Go To 3
No
>> Go To 4
3.
CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND
DOOR COMMON DRIVER CIRCUIT
Disconnect the Left Blend Door Actuator harness connector.
Measure the resistance between the (C255) Left Blend Door Driver cir-
cuit and the (C55) Left Blend Door Common Driver circuit in the A/C
Heater Control C2 harness connector.
Is the resistance below 10k ohms?
Yes
>> Repair the (C255) Left Blend Door Driver circuit 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
>> 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).
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HVAC - ELECTRICAL DIAGNOSTICS
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B10A3–LEFT BLEND DOOR CONTROL CIRCUIT LOW (ATC) (CONTINUED)
4.
CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER
CIRCUITS
Measure the resistance between the (C255) Left Blend Door Driver cir-
cuit and the (C266) Front Mode Door Driver circuit, (C66) Front Mode
Door Common Driver circuit, (C268) Recirculation Door Driver circuit,
(C68) Recirculation Door Common Driver circuit, (C61) Right Blend
Door Driver circuit, (C161) Right Blend Door Common Driver circuit,
(C139) Rear Mode Door Driver circuit, and the (C939) Rear Mode
Door Common Driver circuit in the A/C Heater Control C2 harness
connector.
Is the resistance below 10k ohms between the (C255) Left
Blend Door Driver circuit and any of the other door driver cir-
cuits?
Yes
>> Repair the circuit(s) 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 5
5.
CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR
DRIVER CIRCUITS
Measure the resistance between the (C55) Left Blend Door Common
Driver circuit and the (C266) Front Mode Door Driver circuit, (C66)
Front Mode Door Common Driver circuit, (C268) Recirculation Door
Driver circuit, (C68) Recirculation Door Common Driver circuit, (C61)
Right Blend Door Driver circuit, (C161) Right Blend Door Common
Driver circuit, (C139) Rear Mode Door Driver circuit, and the (C939)
Rear Mode Door Common Driver circuit in the A/C Heater Control C2
harness connector.
Is the resistance below 10k ohms between the (C55) Left Blend
Door Common Driver circuit and any of the other door driver
circuits?
Yes
>> Repair the circuit(s) with a resistance below 10k ohms for
a short to the (C55) Left Blend Door Common Driver cir-
cuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 6
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HVAC - ELECTRICAL DIAGNOSTICS
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B10A3–LEFT BLEND DOOR CONTROL CIRCUIT LOW (ATC) (CONTINUED)
6.
RUN THE ACTUATOR DTC DETECTION TEST
Reconnect the A/C Heater Control C2 harness connector.
Reconnect the Left Blend Door Actuator harness connector.
Turn the ignition on.
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and then turn the ignition on.
With the scan tool, select System Tests and then select Actuator DTC Detection. When the test is complete, select
View DTCs.
Does the scan tool only display: B10A3–LEFT BLEND DOOR CONTROL CIRCUIT LOW?
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).
No, Other DTC(s) Displayed
Diagnose and repair the other DTC(s). If multiple DTCs are present, diagnose and repair all short high
DTCs before diagnosing short low DTCs. Refer to the Table of Contents in this Section for a complete
list of all HVAC related symptoms.
No, And No Other DTCs Displayed
Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an inter-
mittent short. Repair as necessary.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
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B10A4–LEFT BLEND DOOR CONTROL CIRCUIT HIGH (ATC)
WK
HVAC - ELECTRICAL DIAGNOSTICS
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