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Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. 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  2).

    No 

    1. Check for an intermittent condition by inspecting the related wiring harness for chafed, 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. (Refer to BODY VERIFICATION TEST - VER 1) .
  2. 2)  CHECK (C105) HVAC MUX CONTROL CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS CONNECTOR 
    Fig 1: Checking HVAC MUX Control Circuit
    GC0013891Courtesy 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 (C105) HVAC MUX Control circuit.

    What is the voltage? 

    Below 4.8 Volts 

    1. Go To  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. (Refer to BODY VERIFICATION TEST - VER 1) .

    Above 5.2 Volts 

    1. Go To  4).
  3. 3)  CHECK (C105) HVAC MUX CONTROL CIRCUIT FOR AN OPEN 
    Fig 2: Checking HVAC MUX Control Circuit For Open
    GC0013892Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Instrument Cluster C2 harness connector.

    Measure the resistance of the (C105) HVAC MUX Control circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C2 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. (Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Repair the (C105) HVAC MUX Control circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .
  4. 4)  CHECK (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 3: Checking HVAC MUX Control Circuit
    GC0013891Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Instrument Cluster C2 harness connector.

    Turn the ignition on.

    Measure the voltage of the (C105) HVAC MUX Control circuit.

    Is the voltage above 0.2 volts? 

    Yes 

    1. Repair the (C105) HVAC MUX Control circuit for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1. (Refer to 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. (Refer to BODY VERIFICATION TEST - VER 1) .
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