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Home >> Lexus >> 2003 >> GX 470 >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System (W/Memory) - Diagnosis >> Memory Switch Circuit >> Inspection Procedure
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Inspection Procedure

  1. INSPECT SEAT MEMORY SWITCH 
    1. Disconnect the seat memory switch connector.
    2. Check the continuity of each terminal when each switch is operated.

      Standard: 

      SWITCH TERMINALS CONTINUITY CONDITIONS

      Terminal No. Switch Position Specified Condition
      1 <--> 2 SET switch ON Continuity
      2 <--> 3 SW1 switch ON Continuity
      2 <--> 4 SW2 switch ON Continuity
      Fig 1: Checking Continuity Of Each Terminal
      G03470635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE SEAT MEMORY SWITCH 
    2. OK: GO TO NEXT STEP 
  2. CHECK WIRE HARNESS (SEAT MEMORY SWITCH <--> INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU)) 
    1. Disconnect the D22 switch and B3 ECU connectors.
    2. Check the continuity between the wire harness side connectors.
      Fig 2: Checking Continuity Between Wire Harness Side Connectors
      G03470636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TERMINALS CONTINUITY CONDITIONS

      Symbols (Terminal No.) Condition Specified Condition
      M1 (D22-3) <--> M1 (B3-20) Constant Continuity
      M2 (D22-4) <--> M2 (B3-2) Constant Continuity
      MRY (D22-2) <--> MM (B3-8) Constant Continuity
      E (D22-1) <--> Body ground Constant Continuity
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: CHECK AND REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU) (See  INSTRUMENT PANEL JUNCTION & RELAY BLOCKS  ) 
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