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 (driver side) via CAN. 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 front power seat switch LH. After receiving the request signal, the front power seat switch LH 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 How to Proceed With Troubleshooting.

OK:

CAN communication DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM Diagnosis System
OK -- Continue to next step.

2. CHECK POWER SEAT CONTROL FUNCTION

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

OK:

Each function of power seat operates normally by using front power seat switch LH.

NG -- GO TO OTHER FLOW CHART (Power Seat does not Operate with Front Power Seat Switch) Front Power Seat Does Not Operate With Front Power Seat Switch
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (MIRROR)

(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





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. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE)

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

NEXT -- Continue to next step.

5. CHECK SEAT MEMORY FUNCTION (SEAT POSITION MEMORY FUNCTION)

(a) Perform a memory operation properly. 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 memory switch function operates normally.

NG -- REPLACE FRONT POWER SEAT SWITCH LH

OK -- END (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE) WAS DEFECTIVE)

6. REPLACE FRONT POWER SEAT SWITCH LH

(a) Replace the front power seat switch LH Removal.

NEXT -- Continue to next step.

7. CHECK SEAT MEMORY SWITCH (SEAT POSITION MEMORY FUNCTION)

(a) Perform a memory operation properly. 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 memory switch function operates normally.

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

OK -- END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

8. 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.

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

(a) Disconnect the I8 connector from the outer mirror control ECU assembly (driver side).

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH)

OK -- REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY Removal