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Home >> Ford Truck >> 2012 >> Explorer FWD L4-2.0L Turbo >> Repair and Diagnosis >> Body and Frame >> Seats >> Testing and Inspection >> Pinpoint Tests >> Seating - 1st Row >> Diagnostic Routine J

Diagnostic Routine J




Diagnostic Routine J

Diagnostic Overview

The Memory Seat Does Not Operate Correctly - Does Not Operate Using the Memory Set Switch

Refer to Wiring Diagram Set 123 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

When the memory set switch is activated, it supplies a ground signal to the DSM (Driver Seat Module) to initiate a memory set or recall command. Memory button 1, 2 and 3 each have separate circuits to the DSM (Driver Seat Module).

The DSM (Driver Seat Module) supplies a shared signal return circuit to each position sensor. Each position sensor sends a signal pulse back to the DSM (Driver Seat Module) to monitor the position of the seat track and seat recliner. The DSM (Driver Seat Module) stores the sensor position data when a set command is received and uses this information to return the seat to the stored position when a recall command is received.

When a recall command is initiated, the DSM (Driver Seat Module) supplies voltage and ground to the seat track motors and seat recliner motor to move the seat to the stored position. For information on programming memory positions or recalling a stored memory position, REFER to Memory Position Programming Programming and Relearning.

The pinpoint test diagnoses a memory seat that does not operate correctly using the memory set switch. If the memory seat does not move in all directions using the seat control switch, REFER to Diagnostic Routine I: The Memory Seat is Inoperative, Does Not Operate Correctly - Does Not Operate Horizontally, Vertically or Recline Diagnostic Routine I.

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-Checks

Verify good battery condition before diagnosing the memory seat system. Poor battery condition may interfere with memory seat operation, even if vehicle starting is possible.

Pinpoint Test

1. CHECK THE PCM (Powertrain Control Module) TR (Transmission Range) PID (Parameter Identification) STATES

1. Ignition ON.

2. Using a scan tool, view PCM (Powertrain Control Module) PID (Parameter Identification) TR.

3. Operate the transmission gear selector in all positions while monitoring the PCM (Powertrain Control Module) PID (Parameter Identification) TR states.

Do the PID (Parameter Identification) states agree with the selected positions?








2. CHECK THE DSM (Driver Seat Module) IGNITION SWITCH STATUS (IGN_SW) PID (Parameter Identification) STATES

1. Using a scan tool, view DSM (Driver Seat Module) PIDs (Parameter Identifications).

2. Cycle the ignition switch in all positions while monitoring the DSM (Driver Seat Module) PID (Parameter Identification) IGN_SW states.

Do the PID (Parameter Identification) states agree with the selected positions?








3. RETRIEVE DSM (Driver Seat Module) DTCs (Diagnostic Trouble Codes)

1. Operate the memory seat and memory mirrors in all directions through the full range of travel.

2. Place the memory seat and memory mirrors in central travel positions.

3. Using a scan tool, perform DSM (Driver Seat Module) self-test.

Are any DSM (Driver Seat Module) DTCs (Diagnostic Trouble Codes) retrieved?








4. MONITOR THE DSM (Driver Seat Module) PIDs (Parameter Identifications) AND CHECK THE DSM (Driver Seat Module) FOR CORRECT MEMORY SET SWITCH INPUTS

1. Using a scan tool, view DSM (Driver Seat Module) PIDs (Parameter Identifications).

- Memory 1 recall switch status (MEM_1)
- Memory 2 recall switch status (MEM_2)
- Memory 2 recall switch status (MEM_3)

2. Monitor the DSM (Driver Seat Module) PIDs (Parameter Identifications) while activating the memory set switch, recall 1, recall 2 and recall 3 buttons.

Do the PID (Parameter Identification) states agree with the switch button positions?








5. CHECK THE MEMORY SET SWITCH

1. Ignition OFF.

2. Disconnect: Door Lock Control Switch C541.

3. While pressing and releasing the indicated switch buttons, measure:





Are the resistances less than 20 ohms when the memory recall switch is pressed; and greater than 10,000 ohms when released?








6. CHECK THE MEMORY SET SWITCH GROUND FOR AN OPEN

1. Measure:





Is the resistance less than 3 ohms?








7. CHECK THE MEMORY SET SWITCH CIRCUITS FOR A SHORT TO VOLTAGE

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Disconnect: Driver Seat Side Air Bag C3051.

3. Disconnect: DSM (Driver Seat Module) C341C.

4. Ignition ON.

5. Measure:





Is any voltage present on any circuits?








8. CHECK THE MEMORY SET SWITCH CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








9. CHECK THE MEMORY SET SWITCH CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








10. MONITOR THE DSM (Driver Seat Module) PIDs (Parameter Identifications)

1. Using a scan tool, view DSM (Driver Seat Module) PIDs (Parameter Identifications).

- Driver Power Seat Front Up/Down Sense (SFNT_MT)
- Driver Power Seat Forward/Backward Sense (SFWD_MT)
- Driver Power Seat Recline Sense (SRCL_MT)
- Driver Power Seat Rear Up/Down Sense (SREARMT)

2. Operate the memory seat in all directions through the full range of travel while monitoring the PIDs (Parameter Identifications).

Does each PID (Parameter Identification) indicate the sensor is operational throughout each associated motor's full range of travel?








11. CHECK THE FRONT HEIGHT POSITION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Disconnect: Driver Seat Side Air Bag C3051.

3. Disconnect: DSM (Driver Seat Module) C341B.

4. Disconnect: Driver Seat Front Height Motor C382.

5. Ignition ON.

6. Measure:





Is any voltage present on either circuit?








12. CHECK FRONT HEIGHT POSITION SENSOR CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








13. CHECK FRONT HEIGHT POSITION SENSOR CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








14. CHECK THE REAR HEIGHT POSITION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Disconnect: Driver Seat Side Air Bag C3051.

3. Disconnect: DSM (Driver Seat Module) C341B.

4. Disconnect: Driver Seat Rear Height Motor C363.

5. Ignition ON.

6. Measure:





Is any voltage present on either circuit?








15. CHECK THE REAR HEIGHT POSITION SENSOR CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








16. CHECK THE REAR HEIGHT POSITION SENSOR CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








17. CHECK THE HORIZONTAL POSITION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Disconnect: Driver Seat Side Air Bag C3051.

3. Disconnect: DSM (Driver Seat Module) C341B.

4. Disconnect: Driver Seat Horizontal Motor C362.

5. Ignition ON.

6. Measure:





Is any voltage present on either circuit?








18. CHECK THE HORIZONTAL POSITION SENSOR CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








19. CHECK THE HORIZONTAL POSITION SENSOR CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








20. CHECK THE RECLINER POSITION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Disconnect: Driver Seat Side Air Bag C3051.

3. Disconnect: DSM (Driver Seat Module) C341B.

4. Disconnect: Driver Seat Recliner Motor C3187.

5. Ignition ON.

6. Measure:





Is any voltage present on either circuit?








21. CHECK THE RECLINER POSITION SENSOR CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








22. CHECK THE RECLINER POSITION SENSOR CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








23. CHECK FOR CORRECT DSM (Driver Seat Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all DSM (Driver Seat Module) connectors.

3. Repair:

- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins as necessary
- pushed-out pins - install new pins as necessary

4. Reconnect the DSM (Driver Seat Module) connectors and all previously disconnected rear window defrost system connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?








24. CHECK FOR SRS (Supplemental Restraint System) DTCs (Diagnostic Trouble Codes)

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Connect: Driver Seat Side Air Bag C3051.

3. Connect: All previously disconnected electrical connectors.

4. Ignition ON.

5. Using a scan tool, clear the RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes).

6. Cycle the ignition OFF then ON.

7. Using a scan tool, perform RCM (Restraints Control Module) self-test.

Are any RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes) retrieved during self-test?







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