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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 B1082-HVAC MUX CIRCUIT LOW 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: B1082-HVAC MUX CIRCUIT LOW? 

    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 FOR DTC B1082-HVAC MUX CIRCUIT LOW WITH A/C HEATER CONTROL C1 HARNESS CONNECTOR DISCONNECTED 
    Fig 1: A/C Heater Control C1 Harness Connector
    GC0013889Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the A/C Heater Control C1 harness connector.

    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: B1082-HVAC MUX CIRCUIT LOW? 

    Yes 

    1. Go To  3).

    No 

    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) .
  3. 3)  CHECK (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking HVAC MUX Control Circuit For Short To Ground
    GC0013890Courtesy 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 ground and the A/C Heater Control C1 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C105) HVAC MUX Control circuit for a short to ground.
    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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