GMC 11516051 Flasher,Hazard Lamp & Turn Signal Lamp

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First, several electrical accessories in the vehicle use relays to transmit the electrical signal to the component and if the relay is defective, that component will not operate properly. The various relays are grouped together in several locations like the engine compartment. If a faulty relay is suspected, it can be removed and tested.

On models equipped with a Delco Loe II anti-theft audio system, be sure the The lockout feature is turned off before performing any procedure which requires disconnecting the battery. When the flasher unit is functioning properly, an audible click can be heard during its operation. If the turn signals fail on one side or the other and the flasher unit does not make its characteristic clicking sound, a faulty turn signal bulb is indicated. If both turn signals fail to blink, the problem may be due to a blown fuse, a faulty flasher unit, a broken switch or a loose or open connection. If a quick check of the fuse box indicates that the turn signal fuse has blown, check the wiring for a short time before installing a new fuse. To replace the flasher, simply pull it out of its electrical connector. Make sure that the replacement-unit is identical to the original. Compare the old one to the new one before installing it. Installation is the reverse of removal. The hazard flasher is checked in a fashion similar to the turn signal flasher. To replace it with another one, simply pull it out from its connector under dash and install a new one instead. Make sure you compare this one with another one before fixing into position in order to ensure you don't fix an inferior unit as you dispose off an authentic brand replacement part which would have taken long trouble and time "to find." Installation is done by reversing what was done when removing it.

If both turn signals fail to blink, it may be due to a blown fuse, a faulty flasher unit, a broken switch, or a loose or open connection.

Remove the bolt that secures the large bulkhead electrical connector to the firewall.

The wiring should be checked for a short circuit.

To replace the hazard flasher, the under-dash panel or knee bolster needs to be removed for access and the flasher needs to be unplugged. The replacement unit should be identical to the one it replaces.

Separate the two multi-function switch connectors from the large bulkhead connector.

If a faulty relay is suspected, it can be removed and tested by a dealer service department or a repair shop.