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Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 

    1. Go To step  2).

    No 

    1. 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.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. 2)  CHECK (C221) A/C SWITCH SENSE CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS CONNECTOR 
    Fig 1: Checking A/C Switch Sense Circuit Voltage At A/C Heater Control C1 Harness Connector
    GC0028220Courtesy of DAIMLERCHRYSLER CORP.

    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 

    1. Go To step  3).

    4.8 to 5.2 Volts 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    Above 5.2 Volts 

    1. Go To step  4).
  3. 3)  CHECK (C221) A/C SWITCH SENSE CIRCUIT FOR AN OPEN 
    Fig 2: Checking A/C Switch Sense Circuit For Open
    GC0028222Courtesy of DAIMLERCHRYSLER CORP.

    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 Instrument Cluster C3 harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the Instrument Cluster (CCN) in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (C221) A/C Switch Sense circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  4. 4)  CHECK (C221) A/C SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 3: Checking A/C Switch Sense Circuit Voltage At A/C Heater Control C1 Harness Connector
    GC0028220Courtesy of DAIMLERCHRYSLER CORP.

    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 

    1. Repair the (C221) A/C Switch Sense circuit for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Instrument Cluster (CCN) in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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