CORRECTIVE ACTIONPrior to performing extensive diagnosis, check the vehicles fuses to ensure they are not blown. When this occurs, heat builds up in the flasher unit. This unit relies on heat build up caused by electrical current flow to determine when to break the circuit. The reduction in current flow prevents the flasher unit from reaching the needed temperature to switch the bulbs off. http://clearduplicatefiles.com/turn-signal/car-turn-signal-lights-not-working.html
With the bulbs disconnected from the circuit, the flasher unit cools off. The usual cause of inoperative turn signals is a defective bulb or flasher unit. About.com Food Health Home Money Style Tech Travel More Autos Dating & Relationships Education Entertainment en Carl's Corner - Auto Repair Help DIAGNOSE - THE The cycle will continue as long as the directional switch is turned on. weblink
Turn the directionals in the position where they are inoperative and perform a visual inspection of the exterior bulbs. When the switch is initially turned on, electrical current flows through the flasher unit to the bulbs. On most vehicles the flasher unit is located on the front or on the b
If the directionals only flash in one position and are off constantly in the other direction, the usual cause is a burnt-out bulb. The flasher unit is used to switch the current on and off for both right and left directionals. Replace any bulbs that are not lit. Turn Signal Relay USUAL CAUSEThe turn signals use a flasher unit that acts as a repetitive circuit breaker.
This unit makes then breaks the electrical circuit that turns on the turn signal bulbs. How To Fix Turn Signal Switch If the turn signals are inoperative in both directions, a defective flasher unit or blown fuse is the usual cause. When the heat reaches a predetermined temperature, a metal strip within the unit stretches due to the heat and breaks the electrical circuit turning the bulbs off. When a bulb blows, the current flow in that side of the circuit will be reduced.
Consult your owner's manual for fuse box locations and fuse ratings. Turn Signal Repair Cost Once it has cooled, the metal strip re-contracts and re-closes the electrical circuit turning the bulbs back on.