Toyota Corolla (E120): Circuit description

When the brake pedal is depressed, the stop lamp switch assy sends a signal to the cruise control ecu assy.

When the cruise control ecu assy receives this signal, it cancels the cruise control.

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

The cancel conditions are: battery positive voltage at terminal stp–.

When the brake pedal is depressed, normal battery positive voltage normally is applied through the stop fuse and stop lamp switch assy to terminal stp– of the cruise control ecu assy, and the cruise control ecu assy turns the cruise control to 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.

Also, when the brake pedal is depressed, the magnetic clutch circuit is cut mechanically by the stop lamp switch assy, turning the cruise control off.

Wiring diagram

Inspection procedure

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    Wiring diagram
    1 Inspect terminal voltage(pi) (a) turn Turn the ignition switch to on.  measure voltage between terminal 5 (pi) of cruise control ecu assy and body ground, when the cruise control main switch button is on and off. Ok: 2 Inspect combination meter assy 3 Check harn ...

    If a warning message is displayed
    The multi-information display shows warnings for system malfunctions and incorrectly performed operations, and messages that indicate a need for maintenance. When a message is displayed, perform the appropriate corrective action for the message. If a warning message is displayed again after the ap ...

    Replacement
    1. Drain brake fluid Notice: wash the brake fluid off immediately if it comes into contact with any painted surface. 2. Remove front wheel rh 3. Remove front fender liner rh 4. Remove brake actuator with bracket  turn the latch of the actuator connector to disconnect the connector. ...