Power Seat Position is not Memorized: Procedure

1. 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: Go to next step 

1. Correctly perform a memorizing operation, and then check whether the memory functions normally or the buzzer sounds to indicate that the memorizing operation has been completed.
   NOTE:

   • The memory does not function when the SET, M1 and M2 switches are simultaneously pressed.
   • If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

OK → NORMAL 

NG: Go to next step 

1. Check the Data List for proper functioning of the front power seat switch, seat memory switch, unlock warning switch, front door courtesy light switch (for driver side), ignition switch and PNP switch.
   DRIVER SEAT, PASSENGER SEAT
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   M2 Switch	Seat memory switch M2 signal/ ON or OFF	ON: Seat memory switch M2 is ON OFF: Seat memory switch M2 is OFF	-
   M1 Switch	Seat memory switch M1 signal/ ON or OFF	ON: Seat memory switch M1 is ON OFF: Seat memory switch M1 is OFF	-
   SET Switch	Seat memory set switch signal/ ON or OFF	ON: Memory set switch is ON OFF: Memory set switch is OFF	-
   Memory No1	Driving position memorized with seat memory switch M1/ Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-
   Memory No2	Driving position memorized with seat memory switch M2/ Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-
   Seat Memory No1	Seat position memorized with seat memory switch M1/ Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-
   Seat Memory No2	Seat position memorized with seat memory switch M2/ Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-

   OK

   On Techstream screen, each item changes between ON, OFF and Mem and Not Mem according to above chart.

OK → REPLACE POSITION CONTROL ECU 

NG: Go to next step 

Fig 1: Identifying Seat Memory Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the resistance of the switch.

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   1 - 3	M1 switch pressed	Below 1 Ω
   1 - 4	M2 switch pressed	Below 1 Ω
   1 - 2	SET switch pressed	Below 1 Ω

NG → REPLACE SEAT MEMORY SWITCH 

OK: Go to next step 

Fig 2: Identifying Seat Memory Switch & Multiplex Network Door ECU Front

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the D20 or S29 switch connector.
2. Disconnect the D18 or P10 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   for Driver Side 

   for Front Passenger Side 

   Tester Connection	Specified Condition
   D20-3 (M1) - D18-16 (M1)	Below 1 Ω
   D20-4 (M2) - D18-15 (M2)	Below 1 Ω
   D20-2 (MRY) - D18-24 (MM)	Below 1 Ω
   D20-1 (E) - D18-23 (MSWE)	Below 1 Ω

   Tester Connection	Specified Condition
   S29-3 (M1) - P10-16 (M1)	Below 1 Ω
   S29-4 (M2) - P10-15 (M2)	Below 1 Ω
   S29-2 (MRY) - P10-24 (MM)	Below 1 Ω
   S29-1 (E) - P10-23 (MSWE)	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. After replacing the multiplex network door ECU front, check that the front power seat control functions operate normally using the front seat switches and seat memory switch.

NG → REPLACE SEAT MEMORY SWITCH 

OK → END (MULTIPLEX NETWORK DOOR ECU FRONT IS DEFECTIVE)