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

DESCRIPTION

The main body ECU (driver side junction block assembly) receives seat memory switch signals from the outer mirror control ECU assembly LH via CAN communication. If the seat memory SET switch is being pressed when one of the M1 or M2 switches is pressed, or if one of the M1 or M2 switches is pressed within 3 seconds of pressing the seat memory SET switch, the main body ECU (driver side junction block assembly) sends a memory request signal to the position control ECU and switch assembly. After receiving the request signal, the position control ECU and switch assembly memorizes the location data of each motor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FRONT POWER SEAT CONTROL SYSTEM

   
   

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

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

   
   

   NG

   GO TO PROBLEM SYMPTOMS TABLE Click here

   OK

2. READ VALUE USING GTS (SEAT MEMORY SWITCH)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Mirror L / Data List

   5. Read the Data List according to the display on the GTS.

      Mirror L

      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 Set SW	SET switch / ON or OFF	ON: SET switch on OFF: SET switch off	-

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

   
   

   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 ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Driver Seat / Data List.

   5. Read the Data List according to the display on the GTS.

      Driver Seat

      Tester Display	Test Part	Control Range	Diagnostic Note
      Buzzer	Buzzer operation	OFF/ON	-

      OK
      Buzzer sounds normally.

   
   

   NG

   REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

   OK

4. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

   
   

   1. Replace the outer mirror control ECU assembly LH Click here.

   
   

   NEXT

5. CHECK SEAT POSITION MEMORY FUNCTION

   
   

   1. Store a seat position in memory and check that the buzzer sounds to indicate that a position has been stored Click here.

      Note

      
      

      • The seat position will not be recorded if the SET switch and 2 of the seat memory switches 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 position memory function operates normally.

   
   

   NG

   REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here

   OK

   END (OUTER MIRROR CONTROL ECU ASSEMBLY LH WAS DEFECTIVE)

6. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

   
   

   1. Replace the position control ECU and switch assembly Click here.

   
   

   NEXT

7. CHECK SEAT POSITION MEMORY FUNCTION

   
   

   1. Store a seat position in memory and check that the buzzer sounds to indicate that a position has been stored Click here.

      Note

      
      

      • The seat position will not be recorded if the SET switch and 2 of the seat memory switches 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 position memory function operates normally.

   
   

   NG

   REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

   OK

   END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE)

8. INSPECT SEAT MEMORY SWITCH

   
   
   1. 

      Text in Illustration

      *1	M1 Switch
      *2	M2 Switch
      *3	SET Switch
      *a	Component without harness connected (Seat Memory Switch)

      Remove the seat memory switch Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 - 2 SET switch is pressed Below 1 Ω SET switch is not pressed 10 kΩ or higher 1 - 4 M1 switch is pressed Below 1 Ω M1 switch is not pressed 10 kΩ or higher 1 - 3 M2 switch is pressed Below 1 Ω M2 switch is not pressed 10 kΩ or higher

   
   

   NG

   REPLACE SEAT MEMORY SWITCH Click here

   OK

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

   
   

   1. Disconnect the I13 outer mirror control ECU assembly LH connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition I10-2 (MRY) - I13-1 (MM) Always Below 1 Ω I10-4 (M1) - I13-2 (M1) Always Below 1 Ω I10-3 (M2) - I13-3 (M2) Always Below 1 Ω I10-1 (U) - I13-13 (MSWE) Always Below 1 Ω I13-7 (GND) - Body ground Always Below 1 Ω I13-1 (MM) - Body ground Always 10 kΩ or higher I13-2 (M1) - Body ground Always 10 kΩ or higher I13-3 (M2) - Body ground Always 10 kΩ or higher I13-13 (MSWE) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH Click here