2. Inspection of Control Switch Circuit

No. 2 Inspection of Control Switch Circuit

DESCRIPTION OF OPERATION
The control switch is a switch in which the SET, RESUME and CANCEL switches are integrated. Therefore, different resistance values are used for the individual switches to change the outputs (voltages) to the control unit. Current flows through fuse No.4 of J/B and through the control switch to the control unit.

1. SET switch
When the cruise control switch is ON, if the SET switch is set to ON while vehicle speed is within a range from about 40 to 145 km/h (25 to 90 mph)*1, 40 to 200 km/h (25 to 124 mph)*2, the vehicle starts cruising at the speed. If the SET switch is kept at ON during cruise operation, the vehicle coasts, and starts cruising at the speed reached when the SET switch is set to OFF.

2. RESUME switch
Even if cruise operation is canceled, the vehicle resumes cruising at the speed set before the cancellation. Both when the main switch is set to OFF and when the vehicle speed is reduced to less than 40 km/h (25 mph), the vehicle will not resume cruising at the previously sets speed even if the RESUME switch is set to ON. If the RESUME switch is kept at ON during cruise operation, the engine accelerates, and the vehicle starts cruising at the speed reached when the RESUME switch was set to OFF. (However, when the vehicle speed is raised to more than 145 km/h (90 mph)*1, 200 km/h (124 mph)*2, the vehicle cruises at approximately 145 km/h (90 mph)*1, 200 km/h (124 mph)*2.

3. CANCEL switch
When the CANCEL switch is set to ON during cruise operation, the cancel signal is input to the control unit which internally interrupts the power supply to the vacuum pump assembly for cancellation of cruise operation.

NOTE:
*1: Vehicles built up to April 1991.
*2: Vehicles built from May 1991.

TROUBLESHOOTING HINTS

Diagnosis No.15 (Automatically canceled)

ECU Terminal Voltage: