Cruise Control Wiring Diagrams and information

Cruise Control Wiring Diagrams and information

Cruise Control Wiring Diagrams and information

Safety System

When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control.

A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop light signal circuit.

The cancel condition is that battery positive voltage is supplied to terminal STP.

When the brake is on, battery positive voltage is normally applied through the STOP fuse and stop light switch to terminal STP of the ECM, and the ECM turns the cruise control OFF .

If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive voltage and the cruise control will be turned OFF .

Description And Operation

Set Operation:

When the cruise control main SW is turned ON , the system starts preparations necessary for the cruise control and turns ON the indicator light in the combination meter.

Set Speed Control:

When the SET/COAST SW is operated with the cruise control main SW turned ON during travelling, the constant vehicle speed is controlled.

Coast Control:

When the SET/COAST SW is kept turned ON during cruise control travelling, the engine control module controls the throttle valve to decelerate the vehicle. Every time the SET/COAST SW is turned ON instantaneously, the vehicle speed is decelerated approximately 1.5 kph .

Acceleration Control:

When the RES/ACC SW is kept turned ON during cruise control travelling, the engine control module controls the throttle valve to accelerate the vehicle. Every time the RES/ACC SW is turned ON instantaneously, the vehicle speed is accelerated approximately 1.5 kph .

Resume Control:

When the vehicle speed is within the low speed limit (Approximately 40 kph, 25 mph ) if the cruise control is cancelled, use of the RES/ACC SW accelerates the vehicle to the speed level used before cancelling the cruise control.

Manual Cancel Mechanism:

If any of the following signals is input during cruise control travelling, the cruise control is cancelled.

  • The stop light SW is turned ON .
  • The CANCEL SW is turned ON .
  • The cruise control main SW is turned OFF .
  • The VSC is activated.

Auto Cancel Function:

If any of the following conditions is encountered, the cruise control is automatically cancelled.

  • The stop light SW wiring is faulty or short-circuited.
  • The vehicle speed signal is faulty.
  • The electronically controlled throttle malfunctions.

Override Control Function:

The overdrive control may be cancelled if the vehicle travels on the slope during cruise control travelling. After the overdrive control has been cancelled, if the vehicle speed exceeds the overdrive return speed (The set speed is 2 kph, 1.2 mph ) and it is decided that the slope is finished, the vehicle returns to the overdrive control mode again.

General Wiring of Cruise control System:

V8 Lexus Cruise Control

Cruise Control diagram for Lexus V8

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