GM 15803671 Relay Assembly, Hazard Lamp & Turn Signal Lamp

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The combination flasher-integrated with the hazard flasher switch-flashes the turn signals when the turn signal switch is operated in the 2005 and 2006 models. It operates all four signals when the hazard flasher switch, located between the instrument panel center vents, is operated. When the flasher unit is functioning properly, an audible click can be heard during its operation. If the turn signal indicator on one side of the vehicle flashes much more rapidly than normal, 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 before installing a new fuse. The type of combination flasher unit used on these models have complex internal circuitry, and can't be tested using standard electrical test equipment. Test the circuitry before replacing the flasher with a known-good unit. To remove the flasher/emergency flasher switch, remove the center instrument panel trim bezel. Disconnect the electrical connector, then disengage the tabs or remove the fasteners, as applicable, and pull the flasher/switch out through the front of the trim bezel. Installation is the reverse of removal. For the 2007 and later models, there is no turn signal and hazard flasher relay or module. This function is handled by the Body Control Module (BCM). If a bulb on one side of the vehicle flashes much faster than normal but the bulb at the other end of the vehicle (on the same side) doesn't light at all, the bulb that doesn't flash is probably faulty. Replace the bulb. If both the left and right front or rear turn signal bulbs are not flashing, the turn signal and hazard flasher relay function in the BCM is probably defective. Have the BCM replaced by a dealer service department or other repair facility equipped with the proper tool. This is not a job that you can do at home because the BCM must be programmed with a factory scan tool when it's replaced.

Relay control circuits are typically represented by terminals 85 and 86, connecting to the relay coil. Terminal 86 is connected to battery positive (B+) voltage, while terminal 85 is connected to ground in the presence of a diode or resistor.