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Home >> Lexus >> 2005 >> GX 470 >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System (W/Memory) - Diagnostics >> Memory Switch Circuit >> Inspection Procedure

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: 

      SEAT MEMORY SWITCH

      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: Identifying Seat Memory Switch
      G02965839Courtesy 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.

      Standard: 

      SEAT MEMORY SWITCH <==> INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU)

      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
      Fig 2: Checking Wire Harness (Seat Memory Switch <==> Instrument Panel Junction Block Assy (Body ECU))
      G02965840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: repair OR replace harness and connector 
    2. OK: CHECK AND REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY (BODY ECU) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
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