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Home >> Chrysler >> 2009 >> 300 LX >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Intrusion Transceiver Module (ITM) - Electrical Diagnostics >> DTC Troubleshooting >> B1A41-Security Transmitter Sensor Circuit Open >> Diagnostic Test
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Test

  1. TEST FOR INTERMITTENT CONDITION 
    1. Turn the ignition on.
    2. With the scan tool, record and erase DTCs.
    3. Turn the ignition off and remove the key from the ignition.
    4. Close all doors and arm the VTSS and wait 1 minute.
    5. Disarm the VTSS turn the ignition on and wait 1 minute.
    6. With the scan tool, read DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go to Step  2.

      No 

  2. CHECK THE (A645) INTRUSION TRANSMITTER SENSOR SIGNAL CIRCUIT VOLTAGE 
    Fig 1: Measuring Voltage Between Intrusion Sensor Signal Circuit & Intrusion Transmitter Sensor Ground Circuit
    GC0096974Courtesy of CHRYSLER LLC
    1. Disconnect the Intrusion Sensor Transmitter connector.
      NOTE: Check connectors - Clean/repair as necessary.
    2. Turn the ignition on.
    3. With the scan tool actuate the Intrusion Sensor Transmitter.
    4. Measure the voltage between (A645) Intrusion Sensor Signal circuit and (G945) Intrusion Transmitter Sensor Ground circuit.

      Is the voltage above 10.0 volts

      Yes 

      • Go to Step  3.

      No 

      • Go to Step  4.
  3. CHECK THE INTRUSION SENSOR TRANSMITTER 
    1. Turn the ignition is off.
    2. Install a known good Intrusion Sensor Transmitter.
    3. Turn the ignition on.
    4. With the scan tool erase DTCs.
    5. Turn the ignition off and remove the key from the ignition.
    6. Close all doors and arm the VTSS and wait 1 minute.
    7. Disarm the VTSS turn the ignition on and wait 1 minute.
    8. With the scan tool, read DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      No 

  4. CHECK THE (A645) INTRUSION TRANSMITTER SENSOR SIGNAL WIRE 
    Fig 2: Measuring Resistance Of Intrusion Transmitter Sensor Signal Circuit Between Intrusion Sensor Transmitter Conn & Intrusion Transceiver Module Conn
    GC0096975Courtesy of CHRYSLER LLC
    1. Turn the ignition is off.
    2. Disconnect the Intrusion Transceiver Module connector.
    3. Measure the resistance of the (A645) Intrusion Transmitter Sensor Signal circuit between the Intrusion Sensor Transmitter connector and the Intrusion Transceiver Module connector.

      Is the resistance below 5.0 ohms?

      Yes 

      No 

      • Go to Step  5.
  5. CHECK THE (G945) INTRUSION TRANSMITTER SENSOR GROUND WIRE FOR AN OPEN 
    Fig 3: Measuring Resistance Of Intrusion Transmitter Sensor Ground Circuit From Intrusion Sensor Transmitter Conn To Intrusion Transceiver Module Conn
    GC0096976Courtesy of CHRYSLER LLC
    1. Ensure Ignition is off.
    2. Measure the resistance of the (G945) Intrusion Transmitter Sensor Ground circuit from the Intrusion Sensor Transmitter connector to the Intrusion Transceiver Module connector.

      Is the resistance below 5.0 ohms?

      Yes 

      No