FRONT POWER SEAT CONTROL SYSTEM Driver Side Seat Memory Switch Circuit

DESCRIPTION

The driver side seat memory switch sends signals to the driver side outer mirror control ECU via the multiplex communication system to memorize a given seat position. This memory system does not use a position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The driver side seat memory switch is later used to send signals to the front power seat switch (position control ECU) to return the seat to one of the memorized positions. The power seat memory switch operation can be performed only when the engine switch is on (IG) and the shift lever is in P.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

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

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the tester on.

   4. Read the Data List.

      Seat

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note Seat Memory No 1 M1 switch signal / ON or OFF ON: M1 switch is ON OFF: M1 switch is OFF - Seat Memory No 2 M2 switch signal / ON or OFF ON: M2 switch is ON OFF: M2 switch is OFF - Seat Memory No 3 M3 switch signal / ON or OFF ON: M3 switch is ON OFF: M3 switch is OFF - Seat SET Switch SET switch signal / ON or OFF ON: SET switch is ON OFF: SET switch is OFF -

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

   
   

   NG

   INSPECT SEAT MEMORY SWITCH Click here

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

2. INSPECT SEAT MEMORY SWITCH

   
   

   1. for LHD:

      
      

      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 1 (MRY) - 5 (E) SET switch is pressed Below 1 Ω 2 (M1) - 5 (E) M1 switch is pressed Below 1 Ω 3 (M2) - 5 (E) M2 switch is pressed Below 1 Ω 4 (M3) - 5 (E) M3 switch is pressed Below 1 Ω 1 (MRY) - 5 (E) SET switch is not pressed 10 kΩ or higher 2 (M1) - 5 (E) M1 switch is not pressed 10 kΩ or higher 3 (M2) - 5 (E) M2 switch is not pressed 10 kΩ or higher 4 (M3) - 5 (E) M3 switch is not pressed 10 kΩ or higher

   2. for RHD:

      
      

      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 1 (MMRY) - 5 (E) SET switch is pressed Below 1 Ω 2 (1) - 5 (E) M1 switch is pressed Below 1 Ω 3 (2) - 5 (E) M2 switch is pressed Below 1 Ω 4 (3) - 5 (E) M3 switch is pressed Below 1 Ω 1 (MMRY) - 5 (E) SET switch is not pressed 10 kΩ or higher 2 (1) - 5 (E) M1 switch is not pressed 10 kΩ or higher 3 (2) - 5 (E) M2 switch is not pressed 10 kΩ or higher 4 (3) - 5 (E) SET switch is not pressed 10 kΩ or higher

   
   

   NG

   REPLACE SEAT MEMORY SWITCH Click here

   OK

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

   
   

   1. 

      for LHD:

      
      

      1. Disconnect the outer mirror control ECU LH connector.

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

         Standard Resistance
         Tester Connection Condition Specified Condition M10-22 (M1) - M6-2 (M1) Always Below 1 Ω M10-23 (M2) - M6-3 (M2) Always Below 1 Ω M10-24 (M3) - M6-4 (M3) Always Below 1 Ω M10-25 (MM) - M6-1 (MRY) Always Below 1 Ω M10-26 (MSWE) - M6-5 (E) Always Below 1 Ω

   2. 

      for RHD:

      
      

      1. Disconnect the outer mirror control ECU RH connector.

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

         Standard Resistance
         Tester Connection Condition Specified Condition L10-22 (M1) - L7-2 (1) Always Below 1 Ω L10-23 (M2) - L7-3 (2) Always Below 1 Ω L10-24 (M3) - L7-4 (3) Always Below 1 Ω L10-25 (MM) - L7-1 (MMRY) Always Below 1 Ω L10-26 (MSWE) - L7-5 (E) Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE OUTER MIRROR CONTROL ECU (DRIVER SIDE) Click here