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HOMESERVICE MANUALSDODGE AND RAM2005MAGNUM R/T, AWDREPAIR AND DIAGNOSISELECTRICALGAUGESNAVIGATION SYSTEM & TELECOMMUNICATION SYSTEM - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB1437-VOICE RECOGNITION/PHONE SWITCH INPUT 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)  CHECK FOR ACTIVE DTC 

    With the scan tool, read the active DTC's.

    Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.

    With the scan tool, read the active DTC's.

    Does the scan tool display this DTC as active? 

    Yes 

    1. Go To step  2).

    No 

    1. If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  2. 2)  CHECK THE VOLTAGE OF THE (X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL 
    Fig 1: Checking Voice Recognition/Phone Switch Signal Circuit
    GC0016196Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Inside Rear View Mirror C2 harness connector.

    Turn the ignition on.

    Measure the voltage of the (X730) Voice Recognition/Phone Switch Signal circuit.

    Is the voltage above 5.3 volts? 

    Yes 

    1. Repair the (X730) Voice Recognition/Phone Switch Signal circuit for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Go To step  3).
  3. 3)  INSIDE REAR VIEW MIRROR 
    Fig 2: Checking Voice Recognition/Phone Switch Signal Circuit & Sensor Ground Circuit
    GC0016197Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Connect a jumper wire between (X730) Voice Recognition/Phone Switch Signal circuit and the (X835) Sensor Ground circuit.

    Turn the ignition on.

    With the scan tool, monitor the VR Phone Switch Voltage.

    Is the voltage approximately 0 volts? 

    Yes 

    1. Replace the Inside Rear View Mirror in accordance with the service information.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Go To step  4).
  4. 4)  (X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT OPEN 
    Fig 3: Checking Voice Recognition/Phone Switch Signal Circuit
    GC0016198Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Hands Free Module harness connector.

    Measure the resistance of the (X730) Voice Recognition/Phone Switch Signal circuit between the HFM connector and the inside rear view mirror connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the (X730) Voice Recognition/Phone Switch Signal circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .
  5. 5)  (X835) SENSOR GROUND CIRCUIT OPEN 
    Fig 4: Checking Voice Recognition/Phone Switch Sensor Ground Circuit
    GC0016199Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (X835) Sensor Ground circuit between the HFM connector and the inside rear view mirror connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Hands Free Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Repair the (X835) Sensor Ground circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to 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.