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Home >> Lexus >> 2003 >> LX 470 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - Diagnosis >> Circuit Inspection >> Main Switch Circuit (Cruise Control Switch) >> Inspection Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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 VOLTAGE

    Switch Position Voltage
    Neutral 9-14V
    +/RES 2.1 -4V
    -/SET 4-7.1 V
    CANCEL 6-10.1 V
    Fig 1: Identifying ECM Connector Terminal CCS
    G03374990Courtesy 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 RESISTANCE

      Switch position Resistance (Ω)
      Neutral INFINITY (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: 

    SWITCH POSITION SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    OFF 4-5 No continuity
    ON 4-5 Continuity
    Fig 2: Identifying Terminals 4 & 5 Of Cruise Control Switch Connector
    G03374991Courtesy 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  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
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