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Home >> Lexus >> 2005 >> LX 470 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - Diagnostics >> Circuit Inspection >> Main Switch Circuit (Cruise Control Switch) >> Inspection Procedure

Inspection Procedure

  1. Check voltage between terminal CCS of ECM connector and body ground. 

    PREPARATION: 

    1. Remove the ECM with connector being connected.
    2. Turn ignition switch ON.

    CHECK: 

    Measure voltage between terminal CCS of ECM connector and body ground, when each of the -/SET, +/RES and CANCEL is turned ON.

    OK: 

    SWITCH POSITION AND VOLTAGE

    Switch Position Voltage
    Neutral 9 - 14 V
    +/RES 2.1 - 4 V
    -/SET 4 - 7.1 V
    CANCEL 6 - 10.1 V
    Fig 1: Identifying ECM Connector Terminal CCS
    G02987608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Proceed to next circuit inspection shown on problem symptom table (See  PROBLEM SYMPTOMS TABLE   ). 
    2. NG: Go to Next Step. 
  2. Check main switch continuity. 

    PREPARATION: 

    1. Remove steering wheel center pad (See STEERING WHEEL ).
    2. Disconnect the control switch connector.

    CHECK: 

    1. Measure resistance between terminals 4 and 5 of cruise control switch connector when control switch is operated.
      SWITCH POSITION AND RESISTANCE

      Switch position Resistance Ω
      Neutral No continuity)
      +/RES 210 - 270
      -/SET 560 - 700
      CANCEL 1380 - 1700
    2. Check continuity between terminal 4 and 5 of the control switch connector when the main switch is held on and off.

    OK: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    OFF 4 - 5 No continuity
    ON 4 - 5 Continuity
    Fig 2: Checking Main Switch Continuity
    G02987609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Replace control switch. 
    2. OK: Go to Next Step. 
  3. Check harness and connector between ECM and cruise control switch, cruise control switch and body ground (See  HOW TO PROCEED WITH TROUBLESHOOTING  ). 
    1. NG: Repair or replace harness or connector. 
    2. OK: Go to Next Step. 
  4. Check cruise control indicator light (See  COMBINATION METER  .) 
    1. NG: Replace combination meter. 
    2. OK: Check and replace ECM (See  PROCEDURE  ). 
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