Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Lexus >> 2003 >> SC 430 >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System (W/Memory) - Diagnosis >> Restoring Operation Is Impossible >> Inspection Procedure

Inspection Procedure

  1. FUNCTION CHECK (OPERATION) 
    1. Check whether the manual operation is normal by using the power seat switch.
    1. NG: FLOW CHART 1 
    2. OK: GO TO NEXT STEP 
  2. FUNCTION CHECK (MEMORY) 
    1. Check whether the power seat memory function is normal.
    1. NG: FLOW CHART 2 
    2. OK: GO TO NEXT STEP 
  3. FUNCTION CHECK (REPRODUCING OPERATION) 
    1. Check whether the reproducing operation works under any of the following conditions.
    REPRODUCING OPERATION WORKS CONDITIONS

    Condition
    IG ON, P RANGE
    IG ON, N RANGE, vehicle stopped
    Driver's door open, no key inserted in ignition switch
    1. When the reproducing operation does not work under all the conditions, proceed to A.
    2. When the reproducing operation works under one of the conditions, proceed to B.
    1. B: CHECK AND REPLACE POSITION CONTROL ECU ASSY (See  TERMINALS OF ECU  ) 
    2. A: GO TO NEXT STEP 
  4. READ VALUE OF LEXUS HAND-HELD TESTER 
    1. Using the hand-held tester, check the power seat condition by the ECU data monitor.

    SEAT ECU 

    POWER SEAT CONDITIONS

    Item Condition Standard condition
    SEAT MEM M1 IG ON.P RANGE PRESS SET SW AND M1 SW MEM/NOT MEM
    SEAT MEM M 2 IG ON.P RANGE PRESS SET SW AND M2 SW MEM/NOT MEM
    MEM M1 SW IG ON.P RANGE PRESS M1 SW MEM/NOT MEM
    MEM M2 SW IG ON.P RANGE PRESS M2 SW MEM/NOT MEM
    D-MIRRMEM M1 IG ON.P RANGE PRESS M1 SW MEM/NOT MEM
    D-MIRR MEM M2 IG ON.P RANGE PRESS M2 SW MEM/NOT MEM
    P-MIRRMEM M2 IG ON.P RANGE PRESS M1 SW MEM/NOT MEM
    SETSW SETSW ON/OFF ON/OFF
    M1 SW M1 SW ON/OFF ON/OFF
    M2SW M2 SW ON/OFF ON/OFF
    IGSW IG SW ON ON/OFF
    KEY UNLOOK SW LOOK/UNLOOK ON/OFF
    D-DOOR WARN SW CTY SW ON ON/OFF
    PNP SW P RANGE ON/OFF
    1. When the position memorizing does not work, proceed to A.
    2. When all items work or the seat memory does not work, proceed to B.
    3. When the P range or the vehicle's speed does not work, proceed to C.
    1. B: CHECK AND REPLACE POSITION CONTROL ECU ASSY (See  TERMINALS OF ECU  ) 
    2. C: TO INSTRUMENT PANEL & METER SECTION 
    3. A: GO TO NEXT STEP 
  5. CHECK WIRE HARNESS 
    1. Check the continuity of the wire harness between the seat ECU and the position control sensor with a malfunctioning part detected by the ECU data.
    Fig 1: Locating Position Control Sensor And ECU Connector
    G03370897Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SEAT ECU AND POSITION CONTROL SENSOR CONTINUITY CONDITION

    Tester connection (Connector B <--> Position control sensor) Specified condition
    P21-6 <--> Terminal 3 of defective position sensor Continuity
    P21-13 <--> Terminal 2 of defective position sensor Continuity
    P21-3 <--> Terminal 1 of position sensor for front vertical Continuity
    P21 -A <--> Terminal 1 of position sensor for lifter Continuity
    P21-5 <--> Terminal 1 of position sensor for reclining Continuity
    P21-14 <--> Terminal 1 of position sensor for slide Continuity
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE POSITION CONTROL SENSOR 
scientia non olet · About Mike's Workshop Manuals