FRONT POWER SEAT CONTROL SYSTEM(w/ Seat Position Memory System) Power Seat Position is not Memorized

DESCRIPTION

The main body ECU (multiplex network body ECU) receives seat memory switch signals from the outer mirror control ECU assembly LH*1, RH*2 via CAN communication. If the SET switch is being pressed when one of the M1, M2 or M3 switches is pressed, or if one of the M1, M2 or M3 switches is pressed within 3 seconds of pressing the SET switch, the main body ECU (multiplex network body ECU) sends an memory request signal to the front power seat switch LH*1, RH*2. After receiving the request signal, the front power seat switch LH*1, RH*2 memorizes the location data of each motor.

1*: for LHD

2*: for RHD

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK FRONT POWER SEAT CONTROL FUNCTION

   
   

   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.

   
   

   NG

   GO TO PROBLEM SYMPTOMS TABLE Click here

   OK

2. READ VALUE USING GTS (SEAT MEMORY SWITCH)

   
   

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

      
      

      • *1: for LHD

      • *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.

   
   

   NG

   INSPECT SEAT MEMORY SWITCH Click here

   OK

3. PERFORM ACTIVE TEST USING GTS (BUZZER)

   
   

   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.

   
   

   NG

   REPLACE FRONT POWER SEAT SWITCH Click here

   OK

4. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY

   
   

   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

   
   

   NEXT

5. CHECK SEAT MEMORY SWITCH FUNCTION

   
   

   1. Perform a memory operation properly Click here.

      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.

   
   

   OK

   END (OUTER MIRROR CONTROL ECU ASSEMBLY WAS DEFECTIVE)

   NG

   REPLACE FRONT POWER SEAT SWITCH Click here

6. INSPECT SEAT MEMORY SWITCH

   *1: for LHD

   *2: for RHD

   
   

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

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

   
   

   NG

   REPLACE SEAT MEMORY SWITCH Click here

   OK

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

   *1: for LHD

   *2: for RHD

   
   

   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

   
   

   OK

   REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR