Cadillac 25721611 Flasher Assembly, Hazard Lamp & Turn Signal Lamp

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On 1999 DeVilles, the turn signals and hazard flashers are controlled by two separate flasher units, located under the dash near the steering column and left kick panel. On all Sevilles and 2000 through 2005 DeVilles, the flashers have been combined into one unit, located under the dash by the steering column. 2006 and later vehicles do not use a turn signal relay; the BCM controls the turn signal function by pulsing the voltage to the right or left turn signal lamps after sensing the position of the turn signal multi function switch. 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 (early models), or 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 (later models), a faulty turn signal bulb may be 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. To replace the flasher, remove the left side knee bolster and (if equipped) the close out panel and disconnect the unit(s) from the electrical connector (On later models turn signal/hazard flasher is located under the lest side of the steering column). 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.

To examine continuity through the relay control coil, follow the polarity indicated in the illustration during testing and reverse the ohmmeter leads to check continuity in the other direction. A relay with a resistor should yield consistent resistance values in both directions, while a diode should exhibit higher resistance in the forward polarity direction.