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Home › Lexus › 2004 › LS 430 › Repair and Diagnosis › Accessories & Equipment › Cruise Control Systems › Cruise Control System - Diagnosis › Cruise Control Switch Circuit › Inspection Procedure

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: Locating Turn Ignition Switch To ON Position
      G03513872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      ECM: 

      NORMAL CONDITION CHART

      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 (Sub 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: 

      RESULT

      OK A
      NG (All items are defective.) B
      NG (One to Four items are defective.) C
    1. B: Go to step 2 
    2. C: REPLACE CRUISE CONTROL MAIN SWITCH ASSY (See  REPLACEMENT  ) 
    3. A:PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
  2. INSPECT CRUISE CONTROL MAIN SWITCH ASSY 
    1. Disconnect the cruise control main switch connector.
      Fig 2: Disconnecting Cruise Control Main Switch Connector
      G03513873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      SWITCH CONDITION CHART

      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
    1. NG: REPLACE CRUISE CONTROL MAIN SWITCH ASSY (See  REPLACEMENT  ) 
    2. 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.

      Standard: 

      TESTER CONNECTION CHART

      Tester connection Specification
      A-2 - C13-2 Below 1 Ω
      A-3 - C13-3 Below 1 Ω
      Fig 3: Disconnecting Spiral Cable Connector
      G03513874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE SPIRAL CABLE SUB-ASSY (See  SPIRAL CABLE  ) 
    2. 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.

      Standard: 

      TESTER CONNECTION CHART

      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 Vehicle Side Connector
      G03513875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 5: Identifying Wire Harness And Connector
      G03513876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: REPLACE ECM (See  REPLACEMENT  ) 
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