LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2006 >> LS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - Diagnostics >> Cruise Control Switch Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. READ VALUE ON HAND-HELD TESTER 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. According to the display on the tester, read the "DATA LIST".
    Fig 1: Identifying Cruise Control Main Switch Positions
    G03004523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    HAND-HELD TESTER VALUE (ECM)

    Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
    MAIN SW (MAIN) Main SW signal (Main CPU) / ON or OFF ON: Main SW ON (Pushed on) OFF Main SW OFF (Pushed off) -
    MAIN SW (SUB) Main SW signal (Main CPU) / ON or OFF ON: Main SW ON (Pushed on) OFF Main SW OFF (Pushed off) -
    CANCEL SW CANCEL SW signal / ON or OFF ON: CANCEL SW ON OFF: CANCEL SW OFF -
    SET/COAST SW SET/COAST SW signal / ON or OFF ON: SET/COAST SW ON OFF: SET/COAST SW OFF -
    RES/ACC SW RES/ACC SW signal / ON or OFF ON: RES/ACC SW ON OFF: RES/ACC OFF -

    OK: When cruise control main switch operation is performed the standard values will be above. 

    RESULT DETAIL

    OK A
    NG (All items are defective.) B
    NG (One to Four items are defective.) C

    B: Go to step 2 

    C: REPLACE CRUISE CONTROL MAIN SWITCH ASSY (SEE  REPLACEMENT  ) 

    A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  2. INSPECT CRUISE CONTROL MAIN SWITCH ASSY 
    1. Disconnect the cruise control main switch connector.
      Fig 2: Checking Cruise Control Main Switch Assy
      G03004524Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.
    CRUISE CONTROL MAIN SWITCH CONNECTOR TERMINALS RESISTANCE SPECIFICATION

    Switch condition Tester connection Resistance(Ω)
    Neutral A-2 - A-3 10 kΩ or higher
    RES/ACC A-2 - A-3 210 to 270
    SET/COAST A-2 - A-3 560 to 700
    CANCEL A-2 - A-3 1,380 to 1,700
    Main Switch OFF A-2 - A-3 10 kΩ or higher
    Main Switch ON A-2 - A-3 Below 1 Ω

    NG: REPLACE CRUISE CONTROL MAIN SWITCH ASSY (SEE  REPLACEMENT  ) 

    OK: Go to next step 

  3. INSPECT SPIRAL CABLE SUB-ASSY 
    1. Disconnect the spiral cable connector.
    2. Measure the resistance according to the value(s) in the table below.
    SPIRAL CABLE CONNECTOR TERMINALS RESISTANCE SPECIFICATION

    Tester connection Specification
    A-2 - C13-2 Below 1 Ω
    A-3 - C13-3 Below 1 Ω
    Fig 3: Identifying Spiral Cable Connector Terminals
    G03004525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SPIRAL CABLE SUB-ASSY (SEE  REPLACEMENT  ) 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSY - ECM, BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
    SPIRAL CABLE CONNECTOR TERMINALS RESISTANCE SPECIFICATION

    Tester connection Condition Specification
    Spiral cable (C13-2) - CCS (E2-31) Always Below 1 Ω
    CCS (E2-31) - Body ground Always 10 kΩ or higher
    Spiral cable (C13-3) - Body ground Always Below 1 Ω
    Fig 4: Identifying Spiral Cable Connector Terminals
    G03004526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: [Disconnecting ECM Connector]
    G03004527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (SEE  REPLACEMENT  ) 

scientia non olet · About LEMON Manuals