Front Power Seat Control System (W/ Seat Position Memory System) Power Seat Position Is Not Memorized

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FRONT POWER SEAT CONTROL FUNCTION

READ VALUE USING GTS (SEAT MEMORY SWITCH)

PERFORM ACTIVE TEST USING GTS (BUZZER)

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY

CHECK SEAT MEMORY SWITCH FUNCTION

INSPECT SEAT MEMORY SWITCH

CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY - SEAT MEMORY SWITCH)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. The seat position will not be stored if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
   If a memorizing operation has failed, release all of the switches. The seat memory function will not operate unless the switches are released.
   
2. The seat will not return to the memorized position if 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
   If a restoring operation has failed, release all of the switches. The seat memory function will not operate unless the switches are released.
   
3. The front power seat control system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting (Click here).
   
4. Before replacing the main body ECU (multiplex network body ECU), refer to the Entry and Start System (for Entry Function) (Click here).
   

1. Check that each function of the power seat operates normally by using the front power seat switches (Click here).
   

   OK:

   Each function of power seat operates normally by using seat switches.
   

1. Check the Data List for proper functioning of the seat memory switch LH*1, RH*2 (Click here).
   

   1. *1: for LHD
      
   2. *2: for RHD
      
   
   

   Mirror

   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 GTS screen, each item changes between ON and OFF according to above chart.

1. Connect the GTS to the DLC3.
   

2. Turn the engine switch on (IG).
   

3. Turn the GTS on.
   

4. Enter the following menus: Body Electrical / Driver Seat / Active Test.
   

5. Perform the Active Test according to the display on the GTS.
   
   

   Driver Seat:

   
   

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

   OK:

   Buzzer sounds normally.
   

1. Replace the outer mirror control ECU assembly LH*1, RH*2 with a new or known good one (Click here).
   *1: for LHD
   *2: for RHD
   

1. Perform a memory operation properly (Click here).
   

   NOTICE:

   1. 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.
      
   2. 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.
   

1. Remove the seat memory switch LH*1, RH*2 (Click here).
   

2. Inspect the seat memory switch LH*1, RH*2 (Click here).
   

1. Disconnect the I41*1, I38*2 ECU connector.
   

2. Disconnect the q1*1, p1*2 switch connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance:

   for LHD:

   Tester Connection	Condition	Specified Condition
   I41-2 (M1) - q1-4 (M1)	Always	Below 1 Ω
   I41-3 (M2) - q1-3 (M2)	Always	Below 1 Ω
   I41-4 (M3) - q1-2 (M3)	Always	Below 1 Ω
   I41-1 (MM) - q1-5 (MRY)	Always	Below 1 Ω
   I41-7 (GND) - Body ground	Always	Below 1 Ω
   q1-6 (E) - Body ground	Always	Below 1 Ω
   I41-2 (M1) - Body ground	Always	10 kΩ or higher
   I41-3 (M2) - Body ground	Always	10 kΩ or higher
   I41-4 (M3) - Body ground	Always	10 kΩ or higher
   I41-1 (MM) - Body ground	Always	10 kΩ or higher
   I41-7 (GND) - Body ground	Always	10 kΩ or higher

   for RHD:

   Tester Connection	Condition	Specified Condition
   I38-2 (M1) - p1-4 (M1)	Always	Below 1 Ω
   I38-3 (M2) - p1-3 (M2)	Always	Below 1 Ω
   I38-4 (M3) - p1-2 (M3)	Always	Below 1 Ω
   I38-1 (MM) - p1-5 (MRY)	Always	Below 1 Ω
   I38-7 (GND) - Body ground	Always	Below 1 Ω
   p1-6 (E) - Body ground	Always	Below 1 Ω
   I38-2 (M1) - Body ground	Always	10 kΩ or higher
   I38-3 (M2) - Body ground	Always	10 kΩ or higher
   I38-4 (M3) - Body ground	Always	10 kΩ or higher
   I38-1 (MM) - Body ground	Always	10 kΩ or higher
   I38-7 (GND) - Body ground	Always	10 kΩ or higher