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.

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTC's).
3. Move the seat switch in the rear vertical adjust position three times.
4. Using a scan tool, read DTC's.
  Does the scan tool display DTC B1D76-SEAT REAR VERTICAL POSITION SENSOR CIRCUIT HIGH?
  
  Yes
  - Go To 2.
  No
  - The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly. 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 .
CHECK THE (G402) DRIVER SEAT REAR VERTICAL POSITION SENSE CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking Driver Seat Rear Vertical Position Sense Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Rear Driver Vertical Seat Adjuster Motor connector.
3. Disconnect the MSM C3 connector.
  NOTE:
  Check connectors. Clean and repair as necessary.
4. Turn the ignition on.
5. Measure the Voltage of the (G402) Driver Seat Rear Vertical Position Sense circuit between the Rear Driver Vertical Seat Adjuster Motor connector and ground.
  Is there any Voltage present?
  
  Yes
  - Repair the (G402) Driver Seat Rear Vertical Position Sense circuit for a short to Voltage.
  - Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
  No
  - Go To 3.
CHECK THE (G402) DRIVER SEAT REAR VERTICAL POSITION SENSE CIRCUIT AND THE (G492) DRIVER SEAT REAR VERTICAL SENSOR GROUND CIRCUIT FUNCTION

Fig 2: Checking Driver Seat Rear Vertical Position Sense Function
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Reconnect the MSM C3 connector.
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
  - 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 .
  No
  - Go To 4.
CHECK THE (G402) DRIVER SEAT REAR VERTICAL POSITION SENSE CIRCUIT FOR AN OPEN

Fig 3: Checking Driver Seat Rear Vertical Position Sense Circuit For An Open
Courtesy 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 5.
  No
  - Repair the (G402) Driver Seat Rear Vertical Position Sense circuit for an open.
  - Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .
CHECK THE (G492) DRIVER SEAT REAR VERTICAL SENSOR GROUND CIRCUIT FOR AN OPEN

Fig 4: Checking Driver Seat Rear Vertical Sensor Ground Circuit For An Open
Courtesy 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
  - Repair the (G492) Driver Seat Rear Vertical Sensor Ground circuit for an open.
  - Perform POWER SEAT SYSTEM VERIFICATION TEST. Refer to POWER SEAT SYSTEM VERIFICATION TEST .