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HOMESERVICE MANUALSDODGE AND RAM2005MAGNUM R/T, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEMS - EXTERIOR - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB1644-REAR LEFT TURN CONTROL CIRCUIT HIGHDIAGNOSTIC TEST
2005 Dodge and Ram Magnum R/T, AWD

Diagnostic Test

2005 Dodge and Ram Magnum R/T, AWDSECTION Diagnostic Test
  1. 1)  TEST FOR INTERMITTENT CONDITION 
    Fig 1: SCAN TOOL - STARSCAN
    GC0009617Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on.

    Clear all FCM DTC's

    Turn the Left Turn Signal on.

    With the scan tool, read DTC's.

    Does the scan tool read: B1644-REAR LEFT TURN CONTROL CIRCUIT HIGH? 

    Yes 

    1. Go To step  2).

    No 

    1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. 2)  L63 LEFT TURN SIGNAL CONTROL CIRCUIT 
    Fig 2: L63 LEFT REAR TURN SIGNAL CONTROL
    GC0016065Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PDM connector from the FCM.

    Measure the resistance of the (L63) Left Rear Turn Signal Control circuit.

    Is the resistance above 5.0 ohms? 

    No 

    1. Repair the (L63) Turn Signal Control circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    Yes 

    1. Go To step  3).
  3. 3)   FRONT CONTROL MODULE 

    Turn the ignition off.

    Disconnect the Front Control Module from the PDM 49 way connector.

    Measure the voltage between (L63) Left Rear Turn Signal Control circuit and ground.

    Is there any voltage present? 

    Yes 

    1. Replace the Power Distribution Center.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Front Control Module (FCM). Refer to MODULE-FRONT CONTROL .
    2. Perform BODY VERIFICATION TEST - VER 1 .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.