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Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check voltage between terminals CCS of ECM connector and body ground.

    PREPARATION: 

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

      CHECK: 

      Measure voltage between terminals CCS of ECM connector and body ground, when each of the SET/COAST, RESUME/ACCEL and CANCEL is turned ON.

      Fig 1: Measuring Voltage Between Terminals CCS Of ECM Connector & Body Ground
      G01497208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      Fig 2: Switch Position Voltage Chart
      G01497209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
    2. OK: Go to next step. 
  2. Check control switch continuity. 

    PREPARATION: 

    1. Remove steering wheel center pad.
    2. Disconnect the control switch connector.

      CHECK: 

      Measure resistance between terminals 4 and 5 of control switch connector when control switch is operated.

      Fig 3: Measuring Resistance Between Terminals 4 & 5
      G01497210Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      Fig 4: Switch Position Voltage Chart
      G01497211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Replace control switch. 
    2. OK: Go to next step. 
  3. Check main switch continuity. 

    PREPARATION: 

    Disconnect the control switch connector.

    CHECK: 

    Check continuity between terminals 4 and 5 of control switch connector when main switch is held ON and OFF.

    Fig 5: Checking Continuity Between Terminals 4 & 5
    G01497212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    Fig 6: Main Switch Position & Continuity Chart
    G01497213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Replace control switch. 
    2. OK: Go to next step. 
  4. Check harness and connector between ECM and cruise control switch, cruise control switch and body ground (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG: Repair or replace harness or connector. 
    2. OK: Go to next step. 
  5. 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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