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Cruise Control Switch Circuit: Procedure

WARNING: This page is about a different car, the 2012 Lexus GX 460. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM (CRUISE CONTROL SWITCH) 
    1. Use the Data List to check if the cruise control switch is functioning properly. Refer to DATA LIST / ACTIVE TEST .
      RADAR CRUISE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Main SW M-CPU Cruise control switch (Main CPU) signal / OFF or ON OFF: Cruise control switch off
      ON: Cruise control switch on      		 -
      Cancel Switch Cancel switch signal / OFF or ON OFF: Cancel switch off
      ON: Cancel switch on      		 -
      SET/COAST Switch -SET switch signal / OFF or ON OFF:-SET switch off
      ON:-SET switch on      		 -
      RES/ACC Switch +RES switch signal / OFF or ON OFF: +RES switch off
      ON: +RES switch on      		 -

      OK

      On screen, each item changes between ON and OFF according to above chart.

    NG → See step   2 

    OK → See step   6 

  2. INSPECT CRUISE CONTROL SWITCH 
    1. Remove the cruise control switch. Refer to REMOVAL .
      Fig 1: Identifying Cruise Control Switch, Circuit Diagram & Connector Terminals
      GTY274947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      3 (CCS) - 1 (ECC) Cruise control switch on Below 2.5 Ω
      3 (CCS) - 1 (ECC) Cruise control switch off 1 MΩ or higher
      3 (CCS) - 1 (ECC) +RES switch held on 235 to 245 Ω
      3 (CCS) - 1 (ECC) -SET switch held on 617 to 643 Ω
      3 (CCS) - 1 (ECC) CANCEL switch held on 1509 to 1571 Ω
      2 (R/N) - 1 (ECC) MODE switch held on Below 2.5 Ω

    NG → See step   8 

    OK: Go to next step 

  3. INSPECT CRUISE CONTROL SWITCH WIRE 
    1. Disconnect the z7 spiral with sensor cable sub-assembly connector.
      Fig 2: Identifying z7 Spiral With Sensor Cable & (A) Cruise Control Switch Connector Terminals
      GTY254899Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A cruise control switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z7-3 (CCS) - A-3 (CCS) Always Below 2.5 Ω
      z7-4 (ECC) - A-1 (ECC) Always Below 2.5 Ω
      z7-1 (R/N) - A-2 (R/N) Always Below 2.5 Ω
      z7-3 (CCS) - Body ground Always 1 MΩ or higher
      z7-4 (ECC) - Body ground Always 1 MΩ or higher
      z7-1 (R/N) - Body ground Always 1 MΩ or higher

    NG → REPLACE CRUISE CONTROL SWITCH WIRE 

    OK: Go to next step 

  4. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY 
    1. Remove the spiral with sensor cable sub-assembly. Refer to INSTALLATION - Step 4 .
    2. If there are any defects as follows, replace the spiral with sensor cable sub-assembly with a new one: scratches, cracks, dents or chips in the connector or spiral with sensor cable sub-assembly.
      Fig 3: Identifying Spiral With Sensor Cable Connectors & Terminals
      GTY273650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the spiral with sensor cable sub-assembly.
      1. Set the spiral with sensor cable sub-assembly to the center position. Refer to REMOVAL .
      2. Rotate the spiral with sensor cable sub-assembly 2.5 times clockwise and measure the resistance according to the value(s) in the table below. Then rotate the spiral with sensor cable sub-assembly 5 times counterclockwise and measure the resistance according to the value(s) in the table below.
        NOTE:

        As the spiral with sensor cable sub-assembly may break, do not rotate the spiral with sensor cable sub-assembly more than the specified amount.

        Standard Resistance

        Tester Connection Condition Specified Condition
        3 (CCS) - 1 (CCS) Always Below 1 Ω
        4 (ECC) - 2 (ECC) Always Below 1 Ω
        1 (R/N) - 7 (R/N) Always Below 1 Ω
      3. Set the spiral with sensor cable sub-assembly to the center position and rotate the spiral with sensor cable sub-assembly 2.5 times clockwise. Then, while rotating the spiral with sensor cable sub-assembly 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        3 (CCS) - 1 (CCS) Always Below 1 Ω
        4 (ECC) - 2 (ECC) Always Below 1 Ω
        1 (R/N) - 7 (R/N) Always Below 1 Ω

    NG → See step   7 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - ECM AND BODY GROUND) 
    1. Disconnect the G28 spiral with sensor cable sub-assembly connector.
    2. Disconnect the G45 ECM connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G28-1 (CCS) - G45-11 (CCS) Always Below 1 Ω
      G28-7 (R/N) - G45-17 (CCHG) Always Below 1 Ω
      G28-2 (ECC) - Body ground Always Below 1 Ω
      G28-1 (CCS) - Body ground Always 10 kΩ or higher
      G28-7 (R/N) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   9 

  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  7. REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY. Refer to  REMOVAL 
  8. REPLACE CRUISE CONTROL SWITCH. Refer to  REMOVAL 
  9. REPLACE ECM. Refer to  REMOVAL 
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