Turn Signal Cancel Cam: Description and Operation

The turn signal cancel cam is concealed within the steering column below the steering wheel. The turn signal cancel cam consists of two lobes that are integral to the lower surface of the clockspring rotor. The clockspring mechanism provides turn signal cancellation as well as a constant electrical connection between the horn switch, the driver airbag, and the speed control switches on the steering wheel and the instrument panel wire harness on the steering column. The housing of the clockspring is secured to the steering column and remains stationary. The rotor of the clockspring, including the turn signal cancel cam lobes rotate with the steeling wheel.

The turn signal cancel cam is integral to the clock-spring and cannot be repaired. If faulty or damaged, the entire clockspring assembly must be replaced. (Refer to RESTRAINTS/CLOCKSPRING - DESCRIPTION).

The turn signal cancel cam has two lobes molded into the lower surface of the clockspring rotor. When the turn signals are activated by moving the left multi-function switch control stalk to a detent position, a turn signal cancel actuator is extended from the inside surface of the left multi-function switch housing toward the clockspring rotor. When the steering wheel is rotated during the turn, one of the two turn signal cancel cam lobes will contact the turn signal cancel actuator, but the cancel actuator stays latched. When the steering wheel is rotated back to center as the turn is completed, the cancel actuator is unlatched and releases the left multifunction switch control stalk from its detent cancelling the turn signal event.