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Cruise Control Switch Circuit: Wiring Diagram

Fig 1: Cruise Control Switch Circuit - Wiring Diagram
G04024008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. READ VALUE OF INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG) and turn the intelligent tester main switch ON.
    3. Check the DATA LIST for proper functioning of the cruise control main switch.
      Fig 2: Turning Engine Switch On And Intelligent Tester Main Switch On
      G04024009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      ECM (Cruise control): 

      DATA LIST

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

      OK : When cruise control main switch operation is performed, the results will be same as above. 

      Result: 

      PROBLEM SYMPTOM CHART

      Result Proceed to
      OK A
      NG (All items are defective) B
      NG (1 to 3 items are defective) C

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

    C : REPLACE CRUISE CONTROL MAIN SWITCH 

    B : GO TO NEXT STEP 

  2. INSPECT CRUISE CONTROL MAIN SWITCH 
    1. Disconnect the cruise control main switch connector.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 3: Inspecting Cruise Control Main Switch
      G04024010Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      1 - 3 Neutral 10 kΩ or higher
      1 - 3 RES / ACC 235 to 245 Ω
      1 - 3 SET / COAST 620 to 640 Ω
      1 - 3 CANCEL 1,510 to 1,570 Ω
      1 - 3 Main Switch OFF 10 kΩ or higher
      1 - 3 Main Switch ON Below 1 Ω

    NG : REPLACE CRUISE CONTROL MAIN SWITCH 

    OK : GO TO NEXT STEP 

  3. INSPECT SPIRAL CABLE 
    1. Disconnect the spiral cable connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A-3 - K20-1 Below 1 Ω
      A-4 - K20-2 Below 1 Ω

    NG : REPLACE SPIRAL CABLE 

    Fig 4: Identifying Spiral Cable Connectors Terminals
    G04024011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  4. CHECK WIRE HARNESS (SPIRAL CABLE - ECM AND BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      K20-1 - A7-31 (CCS) Always Below 1 Ω
      A7-31 (CCS) - Body ground Always 10 kΩ or higher
      K20-2 - Body ground Always Below 1 Ω

    NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

    Fig 5: Identifying Spiral Cable - ECM Connector Terminals
    G04024012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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