Toyota 81980-AA021 Flasher Assy, Turn Signal

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The turn signal and hazard flasher is a single combination unit, located in an electrical center behind the left kick panel. When functioning properly, an audible click can be heard during its operation. If the turn signals fail on one side and the flasher unit doesn't make its characteristic clicking sound, or if one bulb flashes faster than normal while the other end of the vehicle on the same side doesn't light at all, a faulty turn signal bulb may be the issue. If both turn signals fail to blink, it could be due to a blown fuse, a faulty flasher unit, a defective switch, or a loose/open connection. Before replacing a blown fuse, check for any wiring shorts. To replace the flasher, disconnect the electrical connector and remove it from the electrical center. Ensure the replacement unit is identical to the original before installing it. Installation is the reverse of removal.

The turn signal and hazard flasher are housed within a compact, canister-shaped unit situated in the relay center under the dashboard near the steering column. When functioning correctly, the flasher emits an audible clicking sound during its operation. If turn signals fail on one side and the characteristic clicking is absent, a faulty turn signal bulb is likely. If both turn signals do not blink, potential causes include a blown fuse, a malfunctioning flasher unit, a broken switch, or a loose/open connection. If a visual inspection of the fuse box reveals a blown turn signal fuse, check for wiring shorts before replacing the fuse. To replace the flasher, pull it out of its holder and unplug it, ensuring the replacement unit matches the original. Installation involves reversing the removal process.

Various electrical accessories within the vehicle, such as the fuel injection system, horns, starter, air conditioning/heating system, and fog lights, utilize relays to transmit electrical signals to the respective components. Relays function by utilizing a low-current control circuit to open and close a high-current power circuit. A defective relay can result in improper component operation. These relays are typically situated in engine compartment fuse/relay boxes. In case of suspected relay malfunction, they can be removed and tested. Faulty relays need to be replaced as a complete unit. To test relays, usually marked for identification, it's important to recognize the control circuit terminals (connected to the relay coil) and the power circuit terminals (connected when the control circuit coil is energized). Fused jumper wires are used to connect the control circuit terminals to the positive battery terminal and the ground. A functional relay should click with these connections. Continuity checks are then performed between the power circuit terminals, following the relay markings. If any of the tests fail, the relay should be replaced.

Most relays are mounted in the engine compartment fuse/relay box, with some specialized relays located in the underhood box at the right fender.