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Home >> Lexus >> 2004 >> RX 330 AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System (W/Memory) - Diagnosis >> Ecu Power Source Circuit >> Inspection Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Inspection Procedure

  1. CHECK FUSE (ECU-B, P/SEAT, ECU-IG NO. 1, AM1) 
    1. Remove the ECU-B fuse from the fl block.
    2. Remove the P/SEAT M-fuse, ECU-IG NO.1 and AM1 fuses from the instrument panel J/B.
    3. Check the resistance.

      Standard: Below 1 Ω 

    1. NG: REPLACE FUSE 
    2. OK: Go to next step 
  2. CHECK WIRE HARNESS (POSITION CONTROL ECU & SWITCH ASSY - BODY GROUND) 
    1. Disconnect the P32 and P33 ECU connectors.
    2. Check the voltage of each terminal of the wire harness side connectors.
      Fig 1: Identifying Position Control ECU & Switch Assy Connectors
      G03487323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      VOLTAGE BETWEEN POSITION CONTROL ECU & SWITCH ASSY TERMINALS AND BODY GROUND

      Tester Connection Switch Position Specified Condition
      P32-8 - Body ground Constant 11 to 14 V
      P33-5 - Body ground Constant 11 to 14 V
      P32-4 - Body ground Ignition switch OFF --> ON 0 V --> 11 to 14 V
    3. Check the resistance between the P33 ECU wire harness side connector and body ground.

      Standard: 

      RESISTANCE BETWEEN P33 ECU WIRE HARNESS SIDE CONNECTOR AND BODY GROUND

      Tester Connection Specified Condition
      P33-1 - Body ground Below 1 Ω
    1. NG: REPAIR OR HARNESS AND CONNECTOR 
    2. OK: REPLACE POSITION CONTROL ECU & SWITCH ASSY 
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