DYNAMIC RADAR CRUISE CONTROL SYSTEM Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch operates 8 functions: SET, -(COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, CANCEL, and MODE. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while it is being operated it in the direction of each arrow and turns off after being released it. The internal contact points of the cruise control main switch are turned on with the switch operation. The driving support ECU then reads the voltage value that has been changed by the switch operation to control MODE, SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL. The dynamic radar cruise control system has two cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.


WIRING DIAGRAM

A01JC78E04

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT CRUISE CONTROL MAIN SWITCH


    1. Remove the cruise control main switch Click here.

      A01JB5SE21
      Text in Illustration
      *1

      Component without harness connected

      (Cruise Control Main Switch)

      		 *2 ON-OFF
      *3 CANCEL *4 -SET
      *5 +RES *6 MODE

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition

      1 - 2

      1 - 3

      		 Main switch off*1 1 MΩ or higher
      1 - 3 Main switch on Below 2.5 Ω
      1 - 2 MODE Below 2.5 Ω
      1 - 3 + RES 235 to 245 Ω
      1 - 3 - SET 617 to 643 Ω
      1 - 3 CANCEL 1509 to 1571 Ω

      *1: The cruise control main switch lever is in the neutral position.

    3. Reinstall the cruise control main switch Click here.


    NG

    REPLACE CRUISE CONTROL MAIN SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - CRUISE CONTROL MAIN SWITCH)


    1. A01JCKME70

      Disconnect the connector from the spiral with sensor cable sub-assembly.

    2. Disconnect the connector from the cruise control main switch.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Cruise control main switch side connector terminal 1 - z10-4 Always Below 1 Ω
      Cruise control main switch side connector terminal 2 - z10-1 Always Below 1 Ω
      Cruise control main switch side connector terminal 3 - z10-3 Always Below 1 Ω
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly)
      *2

      Front view of wire harness connector

      (to Cruise Control Main Switch)

    4. Reconnect the connector to the spiral with sensor cable sub-assembly.

    5. Reconnect the connector to the cruise control main switch.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - CRUISE CONTROL MAIN SWITCH)

    OK

  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

    Note

    The spiral with sensor cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral with sensor cable sub-assembly may cause airbag deployment. Be sure to read the page shown in the brackets.


    1. A01JAYKE63

      Remove the spiral with sensor cable sub-assembly Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      z10-1 - L52-7 (R/N) The spiral with sensor cable sub-assembly is centered Below 1 Ω
      The spiral with sensor cable sub-assembly position is 2.5 rotations to the left
      The spiral with sensor cable sub-assembly position is 2.5 rotations to the right
      z10-3 - L52-1 (CCS) The spiral with sensor cable sub-assembly is centered Below 1 Ω
      The spiral with sensor cable sub-assembly position is 2.5 rotations to the left
      The spiral with sensor cable sub-assembly position is 2.5 rotations to the right
      z10-4 - L52-2 (ECC) The spiral with sensor cable sub-assembly is centered Below 1 Ω
      The spiral with sensor cable sub-assembly position is 2.5 rotations to the left
      The spiral with sensor cable sub-assembly position is 2.5 rotations to the right
      Text in Illustration
      *1

      Component without harness connected

      (Spiral with Sensor Cable Sub-assembly)

      Tech Tips

      The spiral with sensor cable sub-assembly makes a maximum of approximately 5 rotations.

    3. Install the spiral with sensor cable sub-assembly Click here.


    NG

    REPLACE SPIRAL WITH CABLE SUB-ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - DRIVING SUPPORT ECU)


    1. A01JB04E04

      Disconnect the driving support ECU connector.

    2. Disconnect the spiral with sensor cable sub-assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      L60-23 (CCS) - L52-1 (CCS) Always Below 1 Ω
      L60-10 (CCHG) - L52-7 (R/N) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      L60-23 (CCS) or L52-1 (CCS) - Body ground Always 10 kΩ or higher
      L60-10 (CCHG) or L52-7 (R/N) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly)
      *2

      Front view of wire harness connector

      (to Driving Support ECU)

    4. Reconnect the driving support driving support ECU connector.

    5. Reconnect the spiral with sensor cable sub-assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - DRIVING SUPPORT ECU)

    OK

  5. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - BODY GROUND)


    1. A01J8V1E11

      Disconnect the spiral with sensor cable sub-assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      L52-2 (ECC) - Body ground Always Below 1 Ω
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly)

    3. Reconnect the spiral with sensor cable sub-assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - BODY GROUND)

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here