The front vertical, rear vertical, and horizontal seat position sensors are potentiometers that are either attached directly to the motor transmission cable or are an internal part of the motor. The memory seat module (MSM) supplies a 5 V reference voltage through the 5 V reference circuit and ground through the low reference circuit to the respective seat position sensors. When the motor or cable rotates, the resistance of the potentiometer varies changing the feedback voltage of the position sensor signal circuit. The MSM monitors this voltage signal to determine the position of the seat. When the MSM detects that one of the seat position sensor signal circuits is out of the voltage range of 0.25-4.75 V, a DTC will be set for that signal circuit.

B2355, B2365, or B2375

If the MSM detects the analog input from this sensor is less than 0.25 V or greater than 4.75 V, the sensor will be considered out of range and the MSM will set the appropriate DTC.

The motor associated with the fault will be disabled for memory functions.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Driver Position Module driver seat position sensor parameters. The readings should be between 0.25 V and 4.75 V and change while adjusting seat positions.

1. Ignition OFF, disconnect the appropriate X2, X3, X4 harness connector at the seat adjuster motor assembly.
2. Test for less than 5 Ω between the appropriate low reference circuit terminal listed below and ground:

•	Seat front vertical sensor terminal A

•	Seat rear vertical sensor terminal A

•	Seat horizontal sensor terminal C

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.

3. Ignition ON, test for 4.8-5.2 V between the appropriate 5 V reference circuit terminal listed below and ground:

•	Seat front vertical sensor terminal C

•	Seat rear vertical sensor terminal C

•	Seat horizontal sensor terminal A

⇒	If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

⇒	If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

4. Verify the appropriate scan tool driver seat sensor parameter listed below is less than 1 V:

•	Driver Seat Front Vertical Sensor

•	Driver Seat Rear Vertical Sensor

•	Driver Seat Horizontal Sensor

⇒	If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the MSM.

5. Install a 3 A fused jumper wire between the appropriate signal and 5 V reference circuit terminals listed below:

•	Seat front vertical sensor terminal B and terminal C

•	Seat rear vertical sensor terminal B and terminal C

•	Seat horizontal sensor terminal B and terminal A

6. Verify the appropriate scan tool driver seat sensor parameter listed below is greater than 4.75 V:

•	Driver Seat Front Vertical Sensor

•	Driver Seat Rear Vertical Sensor

•	Driver Seat Horizontal Sensor

⇒	If less than the specified value, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

7. If all circuits test normal, test or replace the seat position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.