I have replaced the turn signal unit due to failure about one year ago and, recently now have experienced an issue with the turn signal lights. They do not respond, however, the hazard lights do operate. I had one brief intermittent issue then a complete failure. Could this be an issue with the replaced turn signal assembly unit or a failed turn signal relay? I have checked the lamps and the fuses which seem to be all in working order.
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Depending on model and year of car the only way to separate the brake and turn signal lights would be to re-wire one of them completely. The older vehicles, and some newer ones, just use a double filament bulb that handles park / run lights on one side of bulb, and the turn signal / brake light is the other. Newer cars sometimes have the turn signal split to a different set of light sockets which are usually yellow in the tail light housing. But if car is not wired like this you will have to run all new wire for the turn signal system. Some newer vehicles have a sensor in system that detects light bulb failure so if you change the system you may run into issues with this also.
check the front and rear turn signal and brake bulbs ,check for filament wear or drakness in bulb glass.if this is found replace bulb,you may also have a bad ground to a bulb socket, turn lights on (signal and break) and wiggle wires at bulb socket, watch light, if it dim any replace that socket and check the ground wire.
there may ber a recall on this problem, it is caused by the turn sigfnal/hazard flasher combination switch relay in the dash, check with the dealer 1st on the recall to see if it applies if not then u will need to replace the flasher unit in the dash, the switch is part of the hazard button and is located behind the ceter panel of the dash here is the whole recall.
2002 CHEVROLET MALIBU -- In December 2004, GM issued a special policy for MY 1999-2000 Alero, Grand Am and Malibu vehicles not covered under recall 03V327. The policy covered turn signal/hazard flasher failure for a period of 10 years or 150,000 miles (whichever occurred first) to provide a no cost replacement of the hazard switch. GM sent letters to owners starting December 30, 2004. In January 2006, GM will update the special policy to include MY 2002 Alero, Grand Am and Malibu vehicles not covered under recall 03V-327. The policy covers turn signal/hazard flasher failure for a period of 10 years or 150,000 miles (whichever occurs first) to provide a no cost replacement of the hazard switch. GM will send letters to owners starting late April 2006. The actions taken by the manufacturer is sufficient to resolve the issues raised by this investigation. The closing of this investigation does not constitute a finding by NHTSA that no safety-related defect exists. The Agency reserves the right to take future action if warranted by the circumstances. Investigation was initiated on September 27 2005. Closed on January 13 2006. For detailed information & supporting documents, see the official NHTSA page concerning investigation #PE05055 »
If your turn signal lights are flashing erratically and they sometimes get stuck in the on position when used, this will confirm a flasher malfunction. Now, if the turn signal bulbs don't work or flash when you initiate the flashing sequence, via the switch, this will confirm switch or bulbs failure.
Ii recommend inspecting the bulbs for bad filament or rods. if the bulbs have black or gray smudges on the front part of the glass, you will need to replace the turn signal bulbs in this case.
if the bulbs check out fine, this will point directly to the switch. Just to be sure, do an inspection on the turn signal bulb wiring harness as well. inspect thoroughly for worn or ripped wires.