DYNAMIC RADAR CRUISE CONTROL SYSTEM Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch is used to turn the 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 after being released. The internal contact points of the cruise control main switch turn on with switch operation. The driving support ECU then reads the voltage value that has been changed by the switch operation to MODE, SET, -, RES, +, or CANCEL. The dynamic radar cruise control system has two cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.

• Vehicle-to-vehicle distance control mode is selected by default when the dynamic radar cruise control system is turned on using the cruise control main switch (ON-OFF button).

• The operation of constant speed control mode is the same as that for a conventional cruise control system.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. 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.

      

      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 1 - 3 Cruise control main switch ON-OFF button not pressed 1 MΩ or higher 1 - 3 Cruise control main switch ON-OFF button pressed 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

   3. Reinstall the cruise control main switch Click here.

   
   

   NG

   REPLACE CRUISE CONTROL MAIN SWITCH Click here

   OK

2. CHECK CRUISE CONTROL SWITCH WIRE

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Spiral Cable with Sensor Sub-assembly (Steering Angle Sensor))
      *b	Front view of wire harness connector (to Cruise Control Main Switch)

      Disconnect the connector from the spiral cable with sensor sub-assembly (steering angle sensor).

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition Cruise control main switch side connector terminal 1 or z2-4 - Body ground Always 10 kΩ or higher Cruise control main switch side connector terminal 2 or z2-1 - Body ground Always 10 kΩ or higher Cruise control main switch side connector terminal 3 or z2-3 - Body ground Always 10 kΩ or higher

   4. Reconnect the connector to the spiral cable with sensor sub-assembly (steering angle sensor).

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

   
   

   NG

   REPAIR OR REPLACE CRUISE CONTROL SWITCH WIRE

   OK

3. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY (STEERING ANGLE SENSOR)

   
   

   1. Remove the spiral cable with sensor sub-assembly (steering angle sensor) Click here.

   2. Inspect the spiral cable with sensor sub-assembly (steering angle sensor) Click here.

   
   

   NG

   REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY (STEERING ANGLE SENSOR) Click here

   OK

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

   
   

   1. Disconnect the I183 driving support ECU assembly connector.

   2. Disconnect the I28 spiral cable with sensor sub-assembly (steering angle sensor) connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition I183-23 (CCS) - I28-1 (CCS) Always 2.5 Ω or less I183-10 (CCHG) - I28-8 (R/N) Always 2.5 Ω or less

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition I183-23 (CCS) or I28-1 (CCS) - Body ground Always 1 MΩ or higher I183-10 (CCHG) or I28-8 (R/N) - Body ground Always 1 MΩ or higher

   4. Reconnect the I183 driving support ECU assembly connector.

   5. Reconnect the I28 spiral cable with sensor sub-assembly (steering angle sensor) connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Spiral Cable with Sensor Sub-assembly (Steering Angle Sensor))

      Disconnect the I28 spiral cable with sensor sub-assembly (steering angle sensor) 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 spiral cable with sensor sub-assembly (steering angle sensor) connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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