GM 12450054 Flasher Assembly, Hazard Lamp & Turn Signal Lamp

The turn signal flasher is a small canister-shaped or rectangular unit located under the dash, either in a clip adjacent to the steering column or in the convenience center, which is found under the right side of the dashboard and houses relays and other components; later models may have a single combination turn signal/hazard flasher located behind the left kick panel. When functioning properly, the flasher unit emits an audible click during operation, and if turn signals fail on one side without the clicking sound, a faulty turn signal bulb is likely. If both turn signals do not blink, the issue may stem from a blown fuse, a faulty flasher unit, a broken switch, or a loose or open connection, and a blown fuse should prompt a check of the wiring for a short before replacing it. To replace the flasher, unplug it and pull it out of the clip, ensuring the replacement unit matches the original before installation, which follows the reverse of removal. The hazard flasher, also a small canister-shaped or rectangular unit located under the dash, flashes all four turn signals simultaneously when activated and is checked similarly to the turn signal flasher. To replace the hazard flasher, pull it from its retainer or the convenience center, ensuring the new unit is identical to the one being replaced before installation, which also follows the reverse of removal.

With the jumper wires connected, check for continuity between the power circuit terminals as indicated by the relay markings.