Power Seat Position Is Not Memorized

SEAT: FRONT POWER SEAT CONTROL SYSTEM: Power Seat Position is not Memorized

Power Seat Position is not Memorized

DESCRIPTION

When the seat memory SET switch and a seat memory switch (seat memory switch 1, seat memory switch 2 or seat memory switch 3) are pressed simultaneously, the outer mirror control ECU commands the position control ECU and switch through CAN communication to record each position value.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

PROCEDURE

1. CHECK FRONT POWER SEAT CONTROL FUNCTION
(a) Check that each function of the power seat operates normally by using the front power seat switches.
OK:
Each function of power seat operates normally by using seat switches.
NG -- GO TO PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.
2. CHECK SEAT MEMORY SWITCH FUNCTION
(a) Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation.
NOTICE:
- The seat position will not be recorded if the seat memory SET switch and 2 or more of the seat memory switches (for example, seat memory switch 1 and seat memory switch 2) 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 -- CHECK COMBINATION METER FUNCTION
OK -- END
3. CHECK COMBINATION METER FUNCTION
(a) When the engine switch is on (IG) and the shift lever is in P, check that the combination meter shows that the shift lever is in P.
OK:
Meter shows that shift lever is in P.
NG -- GO TO METER / GAUGE SYSTEM
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH)
(a) Check the Data List for proper functioning of the seat memory switch.

Driver Seat





OK:
On the Techstream screen, each item changes between ON and OFF according to above chart.
NG -- INSPECT SEAT MEMORY SWITCH
OK -- REPLACE POSITION CONTROL ECU AND SWITCH
5. 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:






NG -- REPLACE SEAT MEMORY SWITCH
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH)





(a) Disconnect the I18 ECU connector.
(b) Disconnect the X1 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK OUTER MIRROR CONTROL ECU (OPERATION)
(a) After replacing the outer mirror control ECU, check that the front power seat control functions operate normally using the front seat switches and seat memory switch.
OK:
Front power seat control functions operate normally.
NG -- REPLACE POSITION CONTROL ECU AND SWITCH
OK -- END (REPLACE OUTER MIRROR CONTROL ECU)