B1D9B

B1D9B-54-SEAT HORIZONTAL FRONT STOP NOT LEARNED-MISSING CALIBRATION

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Memory System is made up of the Memory Seat Module-Driver (MSMD), Memory Switch, Driver Seat Switch, Adjustable Pedal Switch, and multiple Seat Motors and an Adjustable Pedal Motor. The motors each contain a hall-effect position sensor. The hall-effect position sensor provides feedback to the MSMD in relation to the motors position.

The Driver Seat Switch is a Multiplex (Mux) switch which uses set resistance levels for each switch position. These resistances correspond to different voltages which is monitored by the MSMD over two separate circuits. When a voltage change is detected, the MSMD will command the appropriate Seat motor(s) to move the seat in the requested direction as long as the Driver Seat Switch is held in that direction or its stops have been reached.

The Adjustable Pedal Switch is a three position switch (forward, center, rearward). The MSMD monitors the forward and rearward circuits voltage. If a voltage change is detected, the MSMD will command the Adjustable Pedal motor to move the pedals in the requested direction as long as the Adjustable Pedal Switch is held in that direction or its stops have been reached.

The Memory Switch is a Mux switch that is used to set and recall the seat and pedal positions. When a Memory Switch button is pressed, the Driver Door Module (DDM) detects a voltage change and sends a request over the Controller Area Network (CAN) bus circuit to the MSMD to perform the requested command. If the SET button on the Memory Switch is pressed, followed by the 1 or 2 button, the MSMD will store the seat and pedal positions based on the position inputs received from the hall-effect position sensors. If the 1 or 2 button on the Memory Switch is pressed, the MSMD will recall the stored seat and pedal positions for that particular selection and return the seat and pedals to the stored positions. Memory position may also be recalled using a linked FOBIK transmitter. For driver safety, the MSMD will prevent the memory recall function from being initiated if the transmission gear selector lever is not in the Park position or if the vehicle is moving. For further information Memory Seat Module - Operation.

- When Monitored:
The seat motor is activated.

- Set Condition:
Seat becomes de-standardized. The seat horizontal motor is 5% past the expected soft stop position.





Diagnostic Test

1. CHECK FOR RELATED DTCS
1. Turn the ignition on.
2. With the scan tool, read Memory Seat Module-Driver (MSMD) DTCs.

Does the scan tool display any seat position sensor or circuit performance DTCs?

Yes

- Testing and Inspection and perform the appropriate diagnostic procedure.

No

- Go To 2

2. CHECK IF THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, record and erase MSMD DTCs.
3. Cycle the ignition switch from off to on.
4. Move the seat in the full forward horizontal position.
5. With the scan tool, read MSMD DTCs.

Does the scan tool display this DTC as active?

Yes

- With the scan tool, perform the MSMD Standardization Routine.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.