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 

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 SET switch and 2 or more of the memory switches (for example, M1 and M2) 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: SYSTEM IS OK 

1. When the engine switch is on (IG) and the shift lever is on P, check that the combination meter shows that the shift lever is on P.

   OK: Meter shows that shift lever is on 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 

   DRIVER SEAT DATA LIST
   
   

   Tester Display	Measurement Item/Range	Normal Condition
   SET Switch	Seat memory SET switch signal/ ON or OFF	ON: Memory SET switch is ON OFF: Memory SET switch 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
   M2 Switch	Seat memory switch M2 signal/ ON or OFF	ON: Seat memory switch M2 is ON OFF: Seat memory switch M2 is OFF
   M3 Switch	Seat memory switch M3 signal/ ON or OFF	ON: Seat memory switch M3 is ON OFF: Seat memory switch M3 is OFF

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

NG: Go to step 5 

OK: REPLACE FRONT POWER SEAT SWITCH LH  (See REMOVAL  )

1. Remove the switch.
2. Measure the resistance according to the values in the table below.

   Standard Resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   P7-4 (1) - P7-7 (E)	M1 switch pressed	Below 1 Ω
   P7-2 (2) - P7-7 (E)	M2 switch pressed	Below 1 Ω
   P7-1 (3) - P7-7 (E)	M3 switch pressed	Below 1 Ω
   P7-5 (MMRY) - P7-7 (E)	SET switch pressed	Below 1 Ω

   Fig 1: Identifying Seat Memory Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SEAT MEMORY SWITCH  (See REMOVAL  )

OK: Go to Next Step 

1. Disconnect the P10 ECU connector.
2. Disconnect the P7 switch connector.
3. Measure the resistance according to the values in the table below.

   Standard Resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   P10-13 (M1) - P7-4 (1)	Always	Below 1 Ω
   P10-14 (M2) - P7-2 (2)	Always	Below 1 Ω
   P10-15 (M3) - P7-1 (3)	Always	Below 1 Ω
   P10-16 (MM) - P7-5 (MMRY)	Always	Below 1 Ω
   P10-29 (MSWE) - P7-7 (E)	Always	Below 1 Ω
   P10-13 (M1) - Body ground	Always	10 kΩ or higher
   P10-14 (M2) - Body ground	Always	10 kΩ or higher
   P10-15 (M3) - Body ground	Always	10 kΩ or higher
   P10-16 (MM) - Body ground	Always	10 kΩ or higher
   P10-29 (MSWE) - Body ground	Always	10 kΩ or higher

   Fig 2: Identifying P10 ECU And P7 Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. After replacing the front door 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 FRONT POWER SEAT SWITCH LH  (See REMOVAL  )

OK: REPLACE FRONT DOOR ECU LH  (See COMPONENTS )