Jeep Grand Cherokee WK. Manual — part 1721
B10A4–LEFT BLEND DOOR CONTROL CIRCUIT HIGH (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:
When the Actuator DTC Detection Test is executed.
•
Set Condition:
If the (C255) Left Blend Door Driver circuit or the (C55) Left Blend Door Common Driver circuit is shorted to
voltage.
Possible Causes
(C255) LEFT BLEND DOOR DRIVER CIRCUIT SHORTED TO VOLTAGE
(C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT SHORTED TO VOLTAGE
A/C HEATER CONTROL
Diagnostic Test
1.
CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT & THE (C55) LEFT BLEND 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 (C255) Left Blend Door Driver circuit.
Measure the voltage of the (C55) Left Blend Door Common Driver cir-
cuit.
Is the voltage above 0.2 volts on either circuit?
Yes
>> Repair the circuit(s) with voltage above 0.2 volts a short to
voltage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 2
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B10A4–LEFT BLEND DOOR CONTROL CIRCUIT HIGH (ATC) (CONTINUED)
2.
RUN THE ACTUATOR DTC DETECTION TEST
Turn the ignition off.
Reconnect the A/C Heater Control C2 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: B10A4–LEFT BLEND DOOR CONTROL CIRCUIT HIGH (ATC)?
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).
WK
HVAC - ELECTRICAL DIAGNOSTICS
24 - 233
B10A5–LEFT BLEND DOOR CONTROL CIRCUIT OPEN (ATC)
24 - 234
HVAC - ELECTRICAL DIAGNOSTICS
WK
B10A5–LEFT 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 (C255) Left Blend Door Driver circuit or the (C55) Left Blend Door Common Driver circuit is open.
Possible Causes
(C255) LEFT BLEND DOOR DRIVER CIRCUIT OPEN
(C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT OPEN
LEFT 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 LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Turn the ignition off.
Disconnect the A/C Heater Control C2 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 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).
WK
HVAC - ELECTRICAL DIAGNOSTICS
24 - 235
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