Diagnostic Instructions

DTC Descriptors

DTC B2356: Driver Seat Front Vertical Position Sensor Circuit Range/Performance

DTC B2366: Driver Seat Rear Vertical Position Sensor Circuit Range/Performance

DTC B2376: Driver Seat Horizontal Position Sensor Circuit Range/Performance

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Seat Position Sensors 5-Volt Reference	B2355, B2365, B2375	B2355, B2365, B2375	B2355, B2365, B2375	B2356, B2366, B2376
Front Vertical Seat Motor Position Sensor Signal	B2355	B2355	B2355	--
Horizontal Seat Motor Position Sensor Signal	B2375	B2375	B2375	--
Rear Vertical Seat Motor Position Sensor Signal	B2365	B2365	B2365	--
Seat Position Sensors Low Reference	--	B2355, B2365, B2375	--	B2356, B2366, B2376

Circuit/System Description

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.

Conditions for Running the DTC

Conditions for Setting the DTC

B2356, B2366, or B2376

These DTCs will set when the MSM receives a signal form a seat position sensor that a motor being driven in a commanded direction changes by more than 10 counts (0.2 V) in the wrong direction. The signal mismatches what the MSM is commanding the motors to perform.

Actions Taken When the DTC Sets

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

Conditions for Clearing the DTCs

Diagnostic Aids

The memory seat module is also referred to as the Driver Position Module in certain scan tool menus.

Reference Information

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

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the driver seat adjuster motor assembly.
2. Verify that the appropriate control circuit terminals listed below are in the correct harness connector cavities:

•	Front vertical motor up control terminal C

•	Front vertical motor down control terminal D

•	Rear vertical motor up control terminal E

•	Rear vertical motor down control terminal F

•	Seat horizontal motor forward control terminal A

•	Seat horizontal motor rearward control terminal B

⇒	If the wires are not in the correct cavities, make the appropriate changes.

3. Disconnect the appropriate X2, X3, X4 harness connector at the driver seat adjuster motor assembly.
4. Verify that the appropriate 5 V reference and low reference circuit terminals listed below are in the correct harness connector cavities:

•	Front vertical sensor 5 V reference terminal C

•	Front vertical sensor low reference terminal A

•	Rear vertical sensor 5 V reference terminal C

•	Rear vertical sensor low reference terminal A

•	Seat horizontal sensor 5 V reference terminal A

•	Seat horizontal sensor low reference terminal C

⇒	If the wires are not in the correct cavities, make the appropriate changes.

5. If all circuits test normal, replace the MSM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for MSM replacement, setup, and programming