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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 248 ((HVAC Systems - Electrical Diagnostics)) >> HVAC - Electrical Diagnostics >> DTC Troubleshooting >> B106B-Rear Defrost Control Circuit Low (ATC) >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSTALL A SUBSTITUTE REAR WINDOW DEFOGGER RELAY & THEN CHECK FOR DTC B106B-REAR DEFROST CONTROL CIRCUIT LOW 
    Fig 1: Identifying EBL Relay Terminals
    GC0028224Courtesy of CHRYSLER LLC

    Turn the ignition on.

    Verify that the EBL mode switch is off.

    Turn the ignition off.

    Install a substitute Rear Window Defogger Relay.

    Turn the ignition on.

    With the scan tool, erase HVAC DTCs.

    Turn the ignition off, wait 10 seconds, and turn the ignition on.

    With the scan tool, read HVAC DTCs.

    Does the scan tool display: B106B-REAR DEFROST CONTROL CIRCUIT LOW? 

    Yes 

    1. Go To  2.

    No 

    1. Replace the original Rear Window Defogger Relay in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. CHECK (C115) REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking Rear Window Defogger Relay Control Circuit
    GC0013861Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Remove the substitute Rear Window Defogger Relay.

    Disconnect the A/C Heater Control C1 harness connector.

    Measure the resistance of the (C115) Rear Window Defogger Relay Control circuit between ground and the A/C Heater Control C1 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C115) Rear Window Defogger Relay Control circuit for a short to ground. Reinstall the original Rear Window Defogger Relay.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  3.
  3. CHECK (C115) REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT FOR AN OPEN 
    Fig 3: Checking Rear Window Defogger Relay Control Circuit
    GC0013862Courtesy of CHRYSLER LLC

    Measure the resistance of the (C115) Rear Window Defogger Relay Control circuit between the Rear Window Defogger Relay connector terminal 85 in the PDC and the A/C Heater Control C1 harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the A/C Heater Control in accordance with the Service Information. Reinstall the original Rear Window Defogger Relay.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (C115) Rear Window Defogger Relay Control circuit for an open. Reinstall the original Rear Window Defogger Relay.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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