MSM-Driver Rear Riser Sensor Out Of Range High

MSM-DRIVER REAR RISER SENSOR OUT OF RANGE HIGH





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Continuously with the PCI bus active.

- Set Condition:
This condition is immediately set when the seat motor potentiometer feeds a value higher than the Memory/Heated Seat Adjustable Pedal Module has stored in EEPROM. Code will remain for 50 ignition cycles.





Diagnostic Test

1. STORED DTC
With the scan tool, erase the DTC from Memory/Heated Seat Adjustable Pedal Module (MHSAPM).
Operate the driver's power seat and memory system.
Turn the ignition switch to the Off position then start the engine and let run for one minute.
With the scan tool check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?

Yes

- Go To2

No

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

2. (P28) DRIVER SEAT POSITION SENSOR GROUND CIRCUIT OPEN




Turn ignition off.
Disconnect the Driver Rear Riser Seat Position Sensor connector.
Measure the resistance of the (P28) Driver Seat Position Sensor Ground circuit at the driver rear riser seat position sensor connector.
Is the resistance below 5.0 ohms?

Yes

- Go To3

No

- Go To8

3. (P29) DRIVER SEAT SENSOR 5 VOLT SUPPLY SHORTED HIGH




Disconnect the Driver Rear Riser Seat Position Sensor connector.
Measure the voltage between (P29) Driver Seat Sensor 5 volt supply circuit and ground.
Turn ignition on.
Is the voltage above 5.5 volts?

Yes

- Repair the (P29) Driver Seat Sensor 5 Volt Supply circuit for a short to battery.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Go To4

4. CHECK VOLTAGE ON (P27) DRIVER SEAT REAR RISER POSITION SIGNAL CIRCUIT




Turn ignition off.
Disconnect the Driver Rear Riser Seat Position Sensor Connector.
Disconnect the MHSAPM C2 Connector.
Turn ignition on.
Measure the voltage between (P27) Driver Seat Rear Riser Seat Position Signal circuit and ground.
Is the voltage above 0.2 volts?

Yes

- Repair the (P27) Driver Seat Rear Riser Position Signal circuit for a short to voltage.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Go To5

5. DRIVER REAR RISER SENSOR HIGH
Turn ignition off.
Disconnect the Driver Rear Riser Seat Position Sensor Connector.
Ensure the MHSAPM is fully connected before proceeding.
Turn ignition on.
With the scan tool in Body MHSAPM Sensors
Read the Driver Seat Rear Riser Sensor voltage.
Is the voltage above 0.2 volts?

Yes

- Go To6

No

- Replace the Seat Track Assembly.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

6. DRIVER REAR RISER SEAT POSITION SENSOR SHORT TO MOTOR
Ensure all seat and sensor connectors are connected and rear riser motor is operational.
With the scan tool in MHSAPM Sensors monitor the Driver Seat Rear Riser sensor while operating the seat rear riser to both limits.
Did the voltage ever go above 7.0 volts only when the motor was in operation?

Yes

- Replace the Seat Track Assembly.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Go To7

7. MEMORY/HEATED SEAT ADJUSTABLE PEDAL MODULE
If there are no possible causes remaining, view repair.

Repair

- Replace the Memory/Heated Seat Adjustable Pedal Module.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

8. (P28) DRIVER SEAT POSITION SENSOR GROUND WIRE




Turn ignition off.
Disconnect the MHSAPM C2 connector.
Disconnect the Driver Rear Riser Seat Position Sensor connector.
Measure the resistance of the (P28) Driver Seat Position Sensor Ground wire between the Driver Rear Riser Seat Position Sensor connector and the C2 connector.
Is the resistance below 5.0 ohms?

Yes

- Replace the Memory/Heated Seat Adjustable Pedal Module.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Repair the (P28) Driver Seat Position Sensor Ground wire for an open.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test