DYNAMIC RADAR CRUISE CONTROL SYSTEM Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch is used to turn the dynamic radar cruise control system on and off, as well as operate 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 in the direction of each arrow and turns off when released. The internal contact points of the cruise control main switch turn on with switch operation. The ECM then reads the voltage value that has been changed by the switch operation to control MODE, SET, -, RES, +, or CANCEL function. The dynamic radar cruise control system has 2 cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.


WIRING DIAGRAM

A01HYYZE03

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING TECHSTREAM (MAIN SW M-CPU, CANCEL SWITCH, SET/COAST SWITCH, RES/ACC SWITCH)


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Powertrain / Radar Cruise / Data List.

    5. A01I0G3E02
      Text in Illustration
      *a ON-OFF
      *b CANCEL
      *c -SET
      *d +RES
      *e MODE

      Check the Data List for proper functioning of the cruise control main switch.

      Radar Cruise
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Main SW M-CPU Cruise control main switch signal (Main CPU) / ON or OFF

      ON: Cruise control main switch on

      OFF: Cruise control main switch off

      		 -
      Cancel Switch CANCEL switch signal / ON or OFF

      ON: CANCEL switch on

      OFF: CANCEL switch off

      		 -
      SET/COAST Switch -/SET switch signal / ON or OFF

      ON: -/SET switch on

      OFF: -/SET switch off

      		 -
      RES/ACC Switch +/RES switch signal / ON or OFF

      ON: +/RES switch on

      OFF: +/RES switch off

      		 -
      OK
      When the cruise control main switch is operated, the display changes as shown in the table.

    6. Turn the engine switch off.


    NG

    INSPECT CRUISE CONTROL MAIN SWITCH Click here

    OK

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

  2. INSPECT CRUISE CONTROL MAIN SWITCH


    1. Remove the cruise control main switch Click here.

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

      A01HYXIE31
      Text in Illustration
      *1 Cruise Control Main Switch (ON-OFF button) - -
      *a

      Component without harness connected

      (Cruise Control Main Switch)

      		 *b ON-OFF
      *c +/RES *d -/SET
      *e MODE *f CANCEL
      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Cruise control main switch (ON/OFF button) not pressed 1 MΩ or higher
      MODE Below 1.5 Ω
      1 - 3 Cruise control main switch (ON/OFF button) not pressed 1 MΩ or higher
      Cruise control main switch (ON/OFF button) pressed Below 1.5 Ω
      +/RES 235 to 245 Ω
      -/SET 617 to 643 Ω
      CANCEL 1509 to 1571 Ω

    3. Reinstall the cruise control main switch Click here.


    NG

    REPLACE CRUISE CONTROL MAIN SWITCH Click here

    OK

  3. CHECK CRUISE CONTROL SWITCH WIRE (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - CRUISE CONTROL MAIN SWITCH)


    1. A01HYV2E12
      Text in Illustration
      *1 Cruise Control Switch Wire
      *a

      Front view of wire harness connector

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

      Front view of wire harness connector

      (to Cruise Control Main Switch)

      Remove the cruise control switch wire Click here.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      z2-4 - Cruise control main switch side connector terminal 1 Always Below 1 Ω
      z2-1 - Cruise control main switch side connector terminal 2 Always Below 1 Ω
      z2-3 - Cruise control main switch side connector terminal 3 Always Below 1 Ω

    3. Reinstall the cruise control switch wire.


    NG

    REPAIR OR REPLACE CRUISE CONTROL SWITCH WIRE

    OK

  4. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


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

    2. Inspect the spiral cable with sensor sub-assembly Click here.


    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here

    OK

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


    1. Disconnect the A25 ECM connector.

    2. Disconnect the I28 spiral cable with sensor 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
      A25-47 (CCS) - I28-1 (CCS) Always 2.5 Ω or less
      A25-38 (CCHG) - I28-8 (R/N) Always 2.5 Ω or less
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A25-47 (CCS) or I28-1 (CCS) - Body ground Always 1 MΩ or higher
      A25-38 (CCHG) or I28-8 (R/N) - Body ground Always 1 MΩ or higher

    4. Reconnect the A25 ECM connector.

    5. Reconnect the I28 spiral cable with sensor sub-assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the I28 spiral cable with sensor 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
      I28-2 (ECC) - Body ground Always Below 1 Ω

    3. Reconnect the I28 spiral cable with sensor sub-assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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