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

DESCRIPTION

When the seat memory SET switch and a memory switch (M1 or M2) are pressed simultaneously, the main body ECU commands the position control ECU through CAN communication to record the value of each position sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

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.

      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 INTELLIGENT TESTER (SEAT POSITION MEMORY)

   
   

   1. Use the seat memory switch to record the seat position Click here.

      Note

      
      

      • The seat position will not be recorded if the SET switch and both 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.

   2. Using the intelligent tester, read the Data List Click here.

      Driver Seat

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Seat Memory No1	Seat position memorized with M1 switch / Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-
      Seat Memory No2	Seat position memorized with M2 switch / Mem or Not Mem	Mem: Memorized Not Mem: Not memorized	-

      OK
      "Mem" is displayed on the tester.

   
   

   NG

   READ VALUE USING INTELLIGENT TESTER (SEAT MEMORY SWITCH) Click here

   OK

   END

3. READ VALUE USING INTELLIGENT TESTER (SEAT MEMORY SWITCH)

   
   

   1. Using the intelligent tester, read the Data List Click here.

      Main Body

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      M1 Switch	Seat memory switch M1 signal / ON or OFF	ON: Seat memory switch M1 on OFF: Seat memory switch M1 off	-
      M2 Switch	Seat memory switch M2 signal / ON or OFF	ON: Seat memory switch M2 on OFF: Seat memory switch M2 off	-
      SET Switch	Seat memory switch SET signal / ON or OFF	ON: Seat memory switch SET on OFF: Seat memory switch SET off	-

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

   
   

   NG

   INSPECT SEAT MEMORY SWITCH Click here

   OK

4. CHECK FRONT POWER SEAT SWITCH (OPERATION)

   
   

   1. Replace the front power seat switch with a new one or normally operating one.

   2. Use the seat memory switch to record the seat position Click here.

   3. Refer to the Data List for the driver seat and check that the memory operation is completed normally.

      OK
      Seat position is recorded normally.

   
   

   NG

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

   OK

   END (FRONT POWER SEAT SWITCH WAS DEFECTIVE)

5. INSPECT SEAT MEMORY SWITCH

   
   

   1. 

      Remove the seat memory switch Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition 3 (M1) - 1 (E) Seat memory switch M1 pressed Below 1 Ω 4 (M2) - 1 (E) Seat memory switch M2 pressed Below 1 Ω 2 (MRY) - 1 (E) Seat memory switch SET pressed Below 1 Ω

   
   

   NG

   REPLACE SEAT MEMORY SWITCH Click here

   OK

6. CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH - MAIN BODY ECU AND BODY GROUND)

   
   

   1. Disconnect the K9*1 or J10*2 switch connector.

      
      

      • *1: for LHD

      • *2: for RHD

   2. Disconnect the G63 ECU connector.

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition G63-25 (M1) - K9-3 (M1) Always Below 1 Ω G63-27 (M2) - K9-4 (M2) Always Below 1 Ω G63-26 (MM) - K9-2 (MRY) Always Below 1 Ω K9-1 (E) - Body ground Always Below 1 Ω G63-25 (M1) - Body ground Always 10 kΩ or higher G63-27 (M2) - Body ground Always 10 kΩ or higher G63-26 (MM) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition G63-25 (M1) - J10-3 (M1) Always Below 1 Ω G63-27 (M2) - J10-4 (M2) Always Below 1 Ω G63-26 (MM) - J10-2 (MRY) Always Below 1 Ω J10-1 (E) - Body ground Always Below 1 Ω G63-25 (M1) - Body ground Always 10 kΩ or higher G63-27 (M2) - Body ground Always 10 kΩ or higher G63-26 (MM) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here