Jeep Grand Cherokee WK. Manual — part 1743
B1083–HVAC MUX CIRCUIT HIGH (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:
With the ignition on.
•
Set Condition:
If the Instrument Cluster (CCN) detects voltage above 4.5 volts for 10 seconds on the (C221) A/C Switch
Sense circuit.
Possible Causes
(C221) A/C SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE
(C221) A/C SWITCH SENSE CIRCUIT OPEN
INSTRUMENT CLUSTER (CCN)
A/C HEATER CONTROL
Diagnostic Test
1.
VERIFY DTC B1083–HVAC MUX CIRCUIT HIGH IS ACTIVE
Turn the ignition on.
With the scan tool, erase CCN DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read CCN DTCs.
Does the scan tool display active: B1083–HVAC MUX CIRCUIT HIGH?
Yes
>> Go To 2
No
>> Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced,
pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out,
spread, corroded, or contaminated terminals.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
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HVAC - ELECTRICAL DIAGNOSTICS
WK
B1083–HVAC MUX CIRCUIT HIGH (CONTINUED)
2.
CHECK (C221) A/C SWITCH SENSE CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS
CONNECTOR
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C221) A/C Switch Sense circuit.
What is the voltage?
Below 4.8 Volts
Go To 3
4.8 to 5.2 Volts
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).
Above 5.2 Volts
Go To 4
3.
CHECK (C221) A/C SWITCH SENSE CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the Instrument Cluster C3 harness connector.
Measure the resistance of the (C221) A/C Switch Sense circuit
between the A/C Heater Control C1 harness connector and the Instru-
ment Cluster C3 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Instrument Cluster (CCN) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Repair the (C221) A/C Switch Sense 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
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B1083–HVAC MUX CIRCUIT HIGH (CONTINUED)
4.
CHECK (C221) A/C SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Instrument Cluster C3 harness connector.
Turn the ignition on.
Measure the voltage of the (C221) A/C Switch Sense circuit.
Is the voltage above 0.2 volts?
Yes
>> Repair the (C221) A/C Switch Sense circuit for a short to
voltage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Replace the Instrument Cluster (CCN) 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
WK
B1601–LEFT SOLAR SENSOR CIRCUIT LOW (ATC)
WK
HVAC - ELECTRICAL DIAGNOSTICS
24 - 323
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