Power Seat Position is not Memorized [09/2014 - ]: Procedure

1. Check that each function of the power seat operates normally by using the position control ECU and switch assembly LH.

   Refer to OPERATION CHECK [09/2014 - 11/2017] , or refer to OPERATION CHECK [11/2017 - ]

   OK

   Each function of the power seat operates normally using the position control ECU and switch assembly LH.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2014 - 11/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [11/2017 - ] 

Result: 

OK 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Mirror L / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Mirror L > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Seat Memory Switch1	M1 switch	ON or OFF	ON: M1 switch on OFF: M1 switch off	-
   Seat Memory Switch2	M2 switch	ON or OFF	ON: M2 switch on OFF: M2 switch off	-
   Seat Memory Switch3	M3 switch	ON or OFF	ON: M3 switch on OFF: M3 switch off	-
   Seat Memory Set SW	SET switch	ON or OFF	ON: SET switch on OFF: SET switch off	-

   Body Electrical > Mirror L > Data List 

   Tester Display
   Seat Memory Switch1
   Seat Memory Switch2
   Seat Memory Switch3
   Seat Memory Set SW

   OK

   ON or OFF is displayed on the Techstream according to the table above.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  8

Result: 

OK 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Driver Seat / Active Test.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Driver Seat > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Buzzer	Buzzer operation	OFF/ON	-

   Body Electrical > Driver Seat > Active Test 

   Tester Display
   Buzzer

   OK

   Buzzer sounds normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  4

1. Temporarily replace the outer mirror control ECU assembly (driver door) with a new or known good one.

   Refer to REMOVAL [09/2014 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Check that the seat position memory and restoring function.

   Refer to OPERATION CHECK [09/2014 - 11/2017] , or refer to OPERATION CHECK [11/2017 - ]

   OK

   Seat position memory and restoring function operate normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) WAS DEFECTIVE) 

Result: 

NG 

See step  6

1. Temporarily replace the position control ECU and switch assembly LH with a new or known good one.

   Refer to REMOVAL [09/2014 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  7

1. Check that the seat position memory and restoring function.

   Refer to OPERATION CHECK [09/2014 - 11/2017] , or refer to OPERATION CHECK [11/2017 - ]

   OK

   Seat position memory and restoring function operate normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (POSITION CONTROL ECU AND SWITCH ASSEMBLY LH WAS DEFECTIVE) 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

1. Remove the seat memory switch.

   Refer to REMOVAL [09/2014 - ]

2. Inspect the seat memory switch.

   Refer to INSPECTION [09/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SEAT MEMORY SWITCH. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  9

1. Disconnect the S12 outer mirror control ECU assembly (driver door) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S12-1 (MM) - S5-4 (MMRY)	Always	Below 1 Ω
   S12-1 (MM) or S5-4 (MMRY) - Body ground	Always	10 kΩ or higher
   S12-2 (M1) - S5-1 (1)	Always	Below 1 Ω
   S12-2 (M1) or S5-1 (1) - Body ground	Always	10 kΩ or higher
   S12-3 (M2) - S5-2 (2)	Always	Below 1 Ω
   S12-3 (M2) or S5-2 (2) - Body ground	Always	10 kΩ or higher
   S12-4 (M3) - S5-3 (3)	Always	Below 1 Ω
   S12-4 (M3) or S5-3 (3) - Body ground	Always	10 kΩ or higher
   S12-7 (GND) - Body ground	Always	Below 1 Ω
   S5-5 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR). Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR