Stop Light Switch

Stop Light Switch Circuit

CIRCUIT DESCRIPTION
When the brake is on, battery positive voltage normally applies through the stop fuse and stop switch to terminal STP- of the ECU, and the ECU turns the cruise control off.
A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop light signal circuit.
(1) If the harness connected to terminal STP- has an open, terminal STP- will have battery positive voltage and the cruise control will be turned off, also SET not occurring.
(2) If the stop fuse is open, terminal STP+ becomes approx. 0 V when the brake is turned on, so the ECU performs cancel function normally.
Also, when the brake pedal is pressed, the magnetic clutch circuit is cut by the stop light switch, turning the cruise control off. (See operation of the magnetic clutch.)

Wiring Diagram:

INSPECTION PROCEDURE

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