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Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT SEAT TRACK, MOTOR, AND HARNESS 
    1. Verify seat harness is routed correctly.
    2. Inspect seat track and motor for damage.
    3. Inspect for anything that would prevent the seat from moving to each end-stop.

      Is anything present that would prevent the seat from moving to each end-stop?

      Yes 

      No 

      • Go To  2.
  2. CHECK FOR SEAT POSITION SENSOR DIAGNOSTIC TROUBLE CODES (DTC's) 
    1. Turn the ignition on.
    2. Using a scan tool, read DTC's.

      Does the scan tool display any seat position sensor DTC's?

      Yes 

      No 

      • Go To  3.
  3. TEST FOR INTERMITTENT CONDITION 
    1. Using a scan tool, record and erase DTC's.
    2. Move the seat switch in one rear vertical adjustment direction for at least one second then release the switch. Repeat three times consecutively, but move the switch in the opposite direction each time.
    3. Using a scan tool, read DTC's.

      Does the scan tool display DTC B1D83-SEAT REAR VERTICAL MOTOR CONTROL CIRCUIT PERFORMANCE?

      Yes 

      • Go To  4.

      No 

      • 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. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
      • Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  4. CHECK THE (G402) DRIVER SEAT REAR VERTICAL POSITION SENSE CIRCUIT AND THE (G492) DRIVER SEAT REAR VERTICAL SENSOR GROUND CIRCUIT FUNCTION 
    Fig 1: Checking Driver Seat Rear Vertical Position Sense Function
    GC0090313Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Rear Driver Vertical Seat Adjuster Motor connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    3. Disconnect the scan tool.
    4. Turn off all vehicle interior and exterior lighting.
    5. Mark sure all doors are closed then wait 10 seconds.
    6. Connect a 12-Volt test light between the (G402) Driver Seat Rear Vertical Position Sense circuit and the (G492) Driver Seat Rear Vertical Sensor Ground circuit at the Driver Rear Vertical Seat Adjuster Motor connector.
    7. Move the seat switch in the rear vertical adjust position then release the switch.

      Does the test light illuminate for approximately five seconds then turn off?

      Yes 

      • Go To  5.

      No 

      • Go To  9.
  5. CHECK THE (P111) DRIVER SEAT REAR VERTICAL UP DRIVER CIRCUIT AND THE (P113) DRIVER SEAT REAR VERTICAL DOWN DRIVER CIRCUIT FUNCTION 
    Fig 2: Checking Driver Seat Rear Vertical Up Driver Circuit Function
    GC0090334Courtesy of CHRYSLER GROUP, LLC
    1. Connect a 12-Volt test light between the (P111) Driver Seat Rear Vertical Up Driver circuit and the (P113) Driver Seat Rear Vertical Down Driver circuit at the Rear Driver Vertical Seat Adjuster Motor connector.
    2. Move the seat switch in the rear vertical adjust position.

      Does the test light illuminate with the seat switch engaged?

      Yes 

      • Go To  6.

      No 

      • Go To  11.
  6. CHECK THE REAR DRIVER VERTICAL SEAT ADJUSTER MOTOR OPERATION 
    Fig 3: Checking Rear Driver Vertical Seat Adjuster Motor Operation
    GC0090335Courtesy of CHRYSLER GROUP, LLC
    1. Reconnect the Rear Driver Vertical Seat Adjuster Motor connector.
    2. Disconnect the MSM C3 connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    3. Check motor operation in both directions as follows:
      NOTE:

      Do not adjust the seat against an end-stop when performing the following.

      To drive seat upward:

      • Connect one end of a fused jumper wire to battery Voltage and the other end to the (P111) Driver Seat Rear Vertical Up Driver circuit at the MSM C3 connector.
      • Connect an ammeter between ground and the (P113) Driver Seat Rear Vertical Down Driver circuit at the MSM C3 connector.
      • Disconnect before reaching the end-stop.

      To drive seat downward:

      • Connect one end of a fused jumper wire to battery Voltage and the other end to the (P113) Driver Seat Rear Vertical Down Driver circuit at the MSM C3 connector.
      • Connect an ammeter between ground and the (P111) Driver Seat Rear Vertical Up Driver circuit at the MSM C3 connector.
      • Disconnect before reaching the end-stop.
      NOTE:

      The seat motor should be operational in both directions and the ammeter should read approximately 2.6 amps in the upward direction and 1.4 amps in the downward direction.

      Does the motor operate as specified?

      Yes 

      • Go To  7.

      No 

      • Check (P111) Driver Seat Rear Vertical Up Driver circuit and (P113) Driver Seat Rear Vertical Down Driver circuit for high resistance. If circuits are okay, replace the Rear Driver Vertical Seat Adjuster motor assembly in accordance with the Service Information.
      • Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  7. CHECK THE REAR DRIVER VERTICAL SEAT ADJUSTER MOTOR SENSOR OPERATION 
    Fig 4: Checking Driver Rear Vertical Seat Adjuster Motor Sensor Operation
    GC0090336Courtesy of CHRYSLER GROUP, LLC
    1. Reconnect the MSM C3 connector.
    2. Turn the ignition on.
    3. Using a scan tool, erase DTC's.
    4. Connect the positive lead of a lab scope to the (G402) Driver Seat Rear Vertical Position Sense circuit and the negative lead to the (G492) Driver Seat Rear Vertical Sensor Ground circuit at the MSM C3 connector. Set the lab scope range to 20 Volts and time to 20 ms divisions.
      NOTE:

      Do not adjust the seat against an end-stop when performing the following.

    5. Move the seat switch in one rear vertical adjust position.
      NOTE:

      If the sensor is functioning normally the scope will display a continuously cycling square wave when operating the seat. If the module fails to detect sensor operation it will stop seat operation in approximately two seconds.

      Does the sensor operate as specified?

      Yes 

      • Leave Scope Connected. Go To  8.

      No 

      • Replace the Rear Driver Vertical Seat Adjuster motor assembly in accordance with the Service Information.
      • Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  8. CHECK THE REAR DRIVER VERTICAL SEAT ADJUSTER MOTOR SENSOR OPERATION IN OPPOSITE DIRECTION 
    Fig 5: Checking Driver Rear Vertical Seat Adjuster Motor Sensor Operation
    GC0090336Courtesy of CHRYSLER GROUP, LLC
    1. Using a scan tool, erase DTC's if present.
      NOTE:

      Do not adjust the seat against an end-stop when performing the following.

    2. Move the seat switch in the direction opposite of that previously selected.
      NOTE:

      If the sensor is functioning normally the scope will display a continuously cycling square wave when operating the seat. If the module fails to detect sensor operation it will stop seat operation in approximately two seconds.

      Does the sensor operate as specified?

      Yes 

      • Replace the Memory Seat Module (MSM) in accordance with the Service Information.
      • Perform APS VERIFICATION TEST. Refer to APS VERIFICATION TEST .

      No 

      • Replace the Rear Driver Vertical Seat Adjuster motor assembly in accordance with the Service Information.
      • Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  9. CHECK THE (G402) DRIVER SEAT REAR VERTICAL POSITION SENSE CIRCUIT FOR AN OPEN 
    Fig 6: Checking Driver Seat Rear Vertical Position Sense Circuit For An Open
    GC0090315Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the MSM C3 connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    2. Measure the resistance of the (G402) Driver Seat Rear Vertical Position Sense circuit between the Rear Driver Vertical Seat Adjuster Motor connector and the MSM C3 connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  10.

      No 

  10. CHECK THE (G492) DRIVER SEAT REAR VERTICAL SENSOR GROUND CIRCUIT FOR AN OPEN 
    Fig 7: Checking Driver Seat Rear Vertical Sensor Ground Circuit For An Open
    GC0090316Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (G492) Driver Seat Rear Vertical Sensor Ground circuit between the Driver Rear Vertical Seat Adjuster Motor connector and the MSM C3 connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Replace the Memory Seat Module (MSM) in accordance with the Service Information.
      • Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .

      No 

  11. CHECK THE (P111) DRIVER SEAT REAR VERTICAL UP DRIVER CIRCUIT FOR AN OPEN 
    Fig 8: Checking Driver Seat Rear Vertical Up Driver Circuit For An Open
    GC0090337Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the MSM C3 connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    2. Measure the resistance of the (P111) Driver Seat Rear Vertical Up Driver circuit between the Driver Rear Vertical Seat Adjuster Motor connector and the MSM C3 connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  12.

      No 

  12. CHECK THE (P113) DRIVER SEAT REAR VERTICAL DOWN DRIVER CIRCUIT FOR AN OPEN 
    Fig 9: Checking Driver Seat Rear Vertical Down Driver Circuit For An Open
    GC0090338Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (P113) Driver Seat Rear Vertical Down Driver circuit between the Driver Rear Vertical Seat Adjuster Motor connector and the MSM C3 connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Replace the Memory Seat Module (MSM) in accordance with the Service Information.
      • Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .

      No 

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