Cruise Control Switch Circuit

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch is used to operate 8 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCELERATION), TAP-UP, CANCEL and MODE. The SET, TAP-DOWN and - (COAST) functions, and the RES (RESUME), TAP-UP and + (ACCELERATION) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in each arrow direction and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. Then the ECM reads the resistance value that has been changed by the switch operation to control MODE, SET, - (COAST), RES (RESUME), + (ACCELERATION) and CANCEL. The dynamic radar cruise control system has two cruise control modes: the constant speed control mode and vehicle-to-vehicle distance control mode.
HINT:
- The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic radar cruise control system.
- The operation of the constant speed control mode is the same as the cruise control system.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (CRUISE CONTROL MAIN SWITCH)





(a) Using the Techstream, read the Data List.

Radar Cruise





OK:
The Techstream display changes according to operation of cruise control main switch.
NG -- INSPECT CRUISE CONTROL MAIN SWITCH
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT CRUISE CONTROL MAIN SWITCH





(a) Remove the cruise control main switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE CRUISE CONTROL MAIN SWITCH
OK -- Continue to next step.
3. INSPECT CRUISE CONTROL SWITCH WIRE





(a) Remove the cruise control switch wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE CRUISE CONTROL SWITCH WIRE
OK -- Continue to next step.
4. INSPECT SPIRAL CABLE





(a) Check the spiral cable and connector for scratches, cracks, dents and chips. If any defects are found, replace the spiral cable with a new one.
(b) Check the spiral cable.
(1) Set the spiral cable to the center position Removal.
(2) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance according to the value(s) in the table below. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance according to the value(s) in the table below.
Standard Resistance:






(3) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise. Then while rotating the spiral cable 5 times counterclockwise, measure the resistance according to the value(s) in the table below.
NOTICE:
As the spiral cable may break, do not rotate the spiral cable more than the specified amount.

Standard Resistance:






NG -- REPLACE SPIRAL CABLE
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - ECM AND BODY GROUND)





(a) Disconnect the E12 spiral cable connector.
(b) Disconnect the A38 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM