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B1D7F






B1D7F-00-SEAT FRONT VERTICAL MOTOR CONTROL CIRCUIT PERFORMANCE

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:
The Memory Seat Module-Driver (MSMD) does not detect seat motor activation. The DTC will only set when the seat switch is moved in the same direction three consecutive times.





Diagnostic Test

1. CHECK FOR RELATED DIAGNOSTIC TROUBLE CODES
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 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 Switch in the front vertical position three times.
5. With the scan tool, read MSMD DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3

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 the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

3. CHECK THE (G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE CIRCUIT
1. Turn the ignition off.
2. Disconnect the Driver Front Vertical Seat Adjuster Motor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage between ground and the (G404) Driver Seat Front Vertical Position Sense circuit in the Driver Front Vertical Seat Adjuster Motor harness connector.

Is the voltage above 11.0 volts?

Yes

- Go To 4

No

- Go To 11

4. CHECK THE (G494) DRIVER SEAT FRONT VERTICAL SENSOR GROUND CIRCUIT
1. Measure the voltage between the (G404) Driver Seat Front Vertical Position Sense circuit and the (G494) Driver Seat Front Vertical Sensor Ground circuit.

Is the voltage above 11.0 volts?

Yes

- Go To 5

No

- Go To 12

5. CHECK THE (P119) DRIVER SEAT FRONT VERTICAL UP DRIVER CIRCUIT
1. Measure the voltage between ground and the (P119) Driver Seat Front Vertical Up Driver circuit.

Is the voltage above 1.0 volt?

Yes

- Go To 13

No

- Go To 6

6. CHECK THE (P121) DRIVER SEAT FRONT VERTICAL DOWN DRIVER CIRCUIT
1. Measure the voltage between ground and the (P121) Driver Seat Front Vertical Down Driver circuit.

Is the voltage above 1.0 volt?

Yes

- Go To 14

No

- Go To 7

7. CHECK THE (P119) DRIVER SEAT FRONT VERTICAL UP DRIVER CIRCUIT
1. Connect a 12-volt test light between ground and the (P119) Driver Seat Front Vertical Up Driver circuit.
2. While observing the test light, move the Driver Seat Front Vertical Switch in the up position.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test lamp illuminate brightly?

Yes

- Go To 8

No

- Go To 15

8. CHECK THE (P121) DRIVER SEAT FRONT VERTICAL DOWN DRIVER CIRCUIT
1. Connect a 12-volt test light between ground and the (P121) Driver Seat Front Vertical Down Driver circuit.
2. While observing the test light, move the Driver Seat Front Vertical Switch in the down position.

Does the test light illuminate brightly?

Yes

- Go To 9

No

- Go To 17

9. CHECK THE DRIVER SEAT FRONT VERTICAL DOWN DRIVER
1. Connect a 12-volt test light between the (P119) Driver Seat Front Vertical Up Driver circuit and the (P121) Driver Seat Front Vertical Down Driver circuit.
2. While observing the test light, move the Driver Seat Front Vertical Switch in the up position.

Does the test light illuminate brightly?

Yes

- Go To 10

No

- Go To 19

10. CHECK THE DRIVER SEAT FRONT VERTICAL UP DRIVER
1. While observing the test light, move the Driver Seat Front Vertical Switch in the down position.

Does the test light illuminate brightly?

Yes

- Replace the Power Seat Track. Power Seats - Description.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 19

11. CHECK THE (G404) DRIVER SEAT FRONT VERTICAL POSITION SENSE CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
1. Turn the ignition off.
2. Disconnect the MSMD C5 harness connector.
3. Measure the resistance of the (G404) Driver Seat Front Vertical Position Sense circuit between the Driver Seat Front Vertical Adjuster Motor harness connector and the MSMD C5 harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (G404) Driver Seat Front Vertical Position Sense circuit for an open or excessive resistance.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 19

12. CHECK THE (G494) DRIVER SEAT FRONT VERTICAL SENSOR GROUND CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
1. Turn the ignition off.
2. Disconnect the MSMD C5 harness connector.
3. Measure the resistance of the (G494) Driver Seat Front Vertical Sensor Ground circuit between the Driver Seat Front Vertical Adjuster Motor harness connector and the MSMD C5 harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (G494) Driver Seat Front Vertical Sensor Ground circuit for an open or excessive resistance.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 19

13. CHECK THE (P119) DRIVER SEAT FRONT VERTICAL UP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
1. Disconnect the MSMD C5 harness connector.
2. Measure the voltage between ground the (P119) Driver Seat Front Vertical Up Driver circuit.

Is the voltage above 1.0 volt?

Yes

- Repair the (P119) Driver Seat Front Vertical Up Driver circuit for a short to voltage.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 19

14. CHECK THE (P121) DRIVER SEAT FRONT VERTICAL DOWN DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
1. Disconnect the MSMD C5 harness connector.
2. Measure the voltage between ground and the (P121) Driver Seat Front Vertical Down Driver circuit.

Is the voltage above 1.0 volt?

Yes

- Repair the (P121) Driver Seat Front Vertical Down Driver circuit for a short to voltage.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 19

15. CHECK THE (P119) DRIVER SEAT FRONT VERTICAL UP DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the MSMD C5 harness connector.
3. Measure the resistance between ground and the (P119) Driver Seat Front Vertical Up Driver circuit.

Is the resistance below 100K Ohms?

Yes

- Repair the (P119) Driver Seat Front Vertical Up Driver circuit for a short to ground.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 16

16. CHECKING THE (P119) DRIVER SEAT FRONT VERTICAL UP DRIVER CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
1. Measure the resistance of the (P119) Driver Seat Front Vertical Up Driver circuit between the Driver Seat Front Vertical Adjuster Motor harness connector and the MSMD C5 harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (P119) Driver Seat Front Vertical Up Driver circuit for an open or excessive resistance.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 19

17. CHECK THE (P121) DRIVER SEAT FRONT VERTICAL DOWN DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the MSMD C5 harness connector.
3. Measure the resistance between ground and the (P121) Driver Seat Front Vertical Down Driver circuit.

Is the resistance below 100K Ohms?

Yes

- Repair the (P121) Driver Seat Front Vertical Down Driver circuit for an open.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 18

18. CHECK THE (P121) DRIVER SEAT FRONT VERTICAL DOWN DRIVER CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
1. Measure the resistance of the (P121) Driver Seat Front Vertical Down Driver circuit between the Driver Seat Front Vertical Adjuster Motor harness connector and the MSMD C5 harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (P121) Driver Seat Front Vertical Down Driver circuit for an open or excessive resistance.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Go To 19

19. MEMORY SEAT MODULE (MSMD)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and harness connectors between the Driver Seat Front Vertical Adjuster Motor and the MSMD.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Driver Seat Front Vertical Adjuster Motor and MSMD harness connectors.
4. Perform any Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

No

- Replace and program the MSMD. Memory Seat Module - Removal.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Verification Tests.

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