Brake Switch

The brake switch is mounted on steering column support bracket, under instrument panel. The engine controller uses the brake switch to determine when brakes are being applied or not. When brakes are applied (brake switch on) and if engine controller sees a TPS opening and a lower speed sensor rate, it recognizes a deceleration condition and opens up the Automatic Idle Speed (AIS) motor. The brake switch signal will also disengage speed (cruise) control operation, if it was engaged.