Diagnostic Instructions

DTC Descriptors

DTC B1825: Driver Seat Recline Position Sensor Circuit

DTC B2355: Driver Seat Front Vertical Position Sensor Circuit

DTC B2365: Driver Seat Rear Vertical Position Sensor Circuit

DTC B2375: Driver Seat Horizontal Position Sensor Circuit

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5-Volt Reference - Seat Position Sensors	B1825, B2355, B2365, B2375	B1825, B2355, B2365, B2375	B1825, B2355, B2365, B2375	B1826, B2356, B2366, B2376
Front Vertical Position Sensor Signal	B2355	B2355	B2355	--
Horizontal Position Sensor Signal	B2375	B2375	B2375	--
Recline Position Sensor Signal	B1825	B1825	B1825	--
Rear Vertical Position Sensor Signal	B2365	B2365	B2365	--
Memory Seat/Mirror Sensor Low Reference	--	B1825, B2355, B2365, B2375	--	B1826, B2356, B2366, B2376

Circuit/System Description

The position sensor that sets this diagnostic trouble code (DTC) is either attached to the seat directional motor drive cable or directly to the motor it monitors. It receives a 5-volt reference and low reference from the memory seat module (MSM). The sensor sends a voltage signal that varies with the movement of the seat through the signal circuit to the MSM. Then based on this voltage signal, the MSM determines the position of the seat.

Conditions for Running the DTC

Conditions for Setting the DTC

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

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

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 Verification

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

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate seat position sensor.
2. Test for less than 5 ohms between the appropriate low reference circuit listed below and ground:

•	Seat front vertical sensor terminal A

•	Seat rear vertical sensor terminal A

•	Seat horizontal sensor terminal C

•	Seat recline sensor terminal D

⇒	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 volts between the appropriate 5-volt reference circuit listed below and ground:

•	Seat front vertical sensor terminal C

•	Seat rear vertical sensor terminal C

•	Seat horizontal sensor terminal A

•	Seat recline sensor terminal A

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

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

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

•	Driver Seat Front Vertical Sensor

•	Driver Seat Rear Vertical Sensor

•	Driver Seat Horizontal Sensor

•	Driver Seat Recline Sensor

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

•	Seat front vertical sensor terminal B

•	Seat rear vertical sensor terminal B

•	Seat horizontal sensor terminal B

•	Seat recline sensor terminal C

5. Install a 3A fused jumper wire between the appropriate signal circuit and 5-volt reference circuit 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

•	Seat recline sensor terminal C and terminal A

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

•	Driver Seat Front Vertical Sensor

•	Driver Seat Rear Vertical Sensor

•	Driver Seat Horizontal Sensor

•	Driver Seat Recline 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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.