Power Seat Position Is Not Memorized

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): Power Seat Position is not Memorized
- Power Seat Position is not Memorized

DESCRIPTION

The main body ECU (multiplex network body ECU) receives seat memory switch signals from the outer mirror control ECU assembly (for driver side) via CAN communication. If the seat memory SET switch is being pressed when one of the M1, M2 or M3 switches is pressed, or if one of the M1, M2 or M3 switches is pressed within 3 seconds of pressing the seat memory SET switch, the main body ECU (multiplex network body ECU) sends a memory request signal to the position control ECU and switch assembly. After receiving the request signal, the position control ECU and switch assembly memorizes the location data of each motor.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
* If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Use the Techstream to check if the CAN communication system is functioning normally Diagnosis System.

OK:

CAN communication DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK FRONT POWER SEAT CONTROL SYSTEM

(a) Check that each function of the power seat operates normally by using the power seat switch Operation Check.

OK:

Each function of the power seat operates normally by using the power seat switch.

NG -- GO TO PROBLEM SYMPTOMS TABLE Front Power Seat Does Not Operate With Front Power Seat Switch
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Mirror L / Data List

(e) Read the Data List according to the display on the Techstream.

Mirror L (Outer Mirror Control ECU Assembly (for Driver Side))





OK:

ON or OFF is displayed on the Techstream according to the table above.

NG -- INSPECT SEAT MEMORY SWITCH
OK -- Continue to next step.

4. PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Driver Seat / Data List.

(e) Read the Data List according to the display on the Techstream.

Driver Seat (Position Control ECU and Switch Assembly)





OK:

Buzzer sounds normally.

NG -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal
OK -- Continue to next step.

5. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side)

(a) Replace the outer mirror control ECU assembly (for driver side) Removal.

NEXT -- Continue to next step.

6. CHECK SEAT POSITION MEMORY FUNCTION

(a) Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation Operation Check.

NOTICE:
* The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
* If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

OK:

Seat position memory function operates normally.

NG -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

OK -- END (OUTER MIRROR CONTROL ECU (for Driver Side) WAS DEFECTIVE)

7. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

(a) Replace the position control ECU and switch assembly Removal.

NEXT -- Continue to next step.

8. CHECK SEAT POSITION MEMORY FUNCTION

(a) Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation Operation Check.

NOTICE:
* The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
* If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

OK:

Seat position memory function operates normally.

NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal

OK -- END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

9. INSPECT SEAT MEMORY SWITCH

(a) Remove the seat memory switch Removal.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPLACE SEAT MEMORY SWITCH Removal
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH)

(a) Disconnect the K7 outer mirror control ECU assembly (for driver side) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side) Removal