Inspection 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  (See PROBLEM SYMPTOMS TABLE  )

OK: Go to next step. 

1. Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation.
   NOTE:

   • 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:  Go to step  3

OK: END 

1. 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  (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: Go to next step. 

1. Check the Data List for proper functioning of the seat memory switch.

   Driver Seat 

   DATA LIST
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   SET Switch	Seat memory SET switch signal / ON or OFF	ON: Seat memory SET switch on OFF: Seat memory SET switch off	-
   M1 Switch	Seat memory switch 1 signal / ON or OFF	ON: Seat memory switch 1 on OFF: Seat memory switch 1 off	-
   M2 Switch	Seat memory switch 2 signal / ON or OFF	ON: Seat memory switch 2 on OFF: Seat memory switch 2 off	-
   M3 Switch	Seat memory switch 3 signal / ON or OFF	ON: Seat memory switch 3 on OFF: Seat memory switch 3 off	-

   OK: On the Techstream screen, each item changes between ON and OFF according to above chart. 

NG:  Go to step  5

OK: REPLACE POSITION CONTROL ECU AND SWITCH  (See POWER SEAT SWITCH (FRONT PASSENGER SIDE)  )

1. Remove the seat memory switch (See SEAT MEMORY SWITCH  ).
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   4 (M1) - 6 (E)	Seat memory switch 1 pressed	Below 1 Ω
   3 (M2) - 6 (E)	Seat memory switch 2 pressed	Below 1 Ω
   2 (M3) - 6 (E)	Seat memory switch 3 pressed	Below 1 Ω
   5 (MRY) - 6 (E)	Seat memory SET switch pressed	Below 1 Ω

NG: REPLACE SEAT MEMORY SWITCH  (See SEAT MEMORY SWITCH  )

Fig 1: Identifying Seat Memory Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step. 

1. Disconnect the I18 ECU connector.
2. Disconnect the X1 switch connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   I18-8 (M1) - X1-4 (M1)	Always	Below 1 Ω
   I18-7 (M2) - X1-3 (M2)	Always	Below 1 Ω
   I18-6 (M3) - X1-2 (M3)	Always	Below 1 Ω
   I18-9 (MM) - X1-5 (MRY)	Always	Below 1 Ω
   I18-10 (MSWE) - X1-6 (E)	Always	Below 1 Ω
   I18-8 (M1) - Body ground	Always	10 kΩ or higher
   I18-7 (M2) - Body ground	Always	10 kΩ or higher
   I18-6 (M3) - Body ground	Always	10 kΩ or higher
   I18-9 (MM) - Body ground	Always	10 kΩ or higher
   I18-10 (MSWE) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Seat Memory Switch And Outer Mirror Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step. 

1. 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  (See POWER SEAT SWITCH (FRONT PASSENGER SIDE)  )

OK: END (REPLACE OUTER MIRROR CONTROL ECU)  (See REMOVAL )