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It doesn't have one Controlled by smart junction box .
The smart junction box (SJB) monitors the multifunction switch position by sending multiple voltage reference signals to the multifunction switch. When the multifunction switch is in the LH or RH TURN positions, or the hazard lamp switch is pressed, that input signal is routed to ground.
When the SJB receives a request for a turn signal or hazard lamps, the SJB supplies voltage to the appropriate turn lamps.
The timed on/off cycle is determined by the SJB and is set to flash approximately 80 times per minute if both the front and rear turn lamps operate correctly. If an individual turn signal lamp is inoperative, the SJB flashes the remaining turn lamp approximately 160 times per minute.
Its part of the hazard flasher switch , or should I say the switch is part of it ! Where is your flasher switch located ? In the radio bezel ? the trim plate around the radio if you don't know what a bezel is . Oh yea , to answer you question , yes turn signals do go through it !
There are two possibilities:--
1) The flasher relay or 2) The turn signal switch. check flasher relay,but most likely the fault is the turn signal switch .----------The turn signal / hazard flasher relay is located behind the dash, right of the steering column. --------Since the hazards do work this eliminates a faulty relay as both the hazards and turn signals use the same relay to function. This leads to either faulty wiring at the multifunction (turn signal) switch or a faulty switch itself.It is always a good idea to check the wiring before purchasing the switch.Starting at the switch its the lever.And the switch wiring gets connected to relay.Test it with a meter to see if it is getting power when it is supposed to (turned ON ). If it is then wiring is OK and switch is bad. If it's not getting power then there is a open circuit somewhere in between.so its the wiring problem.------------this will help.Thanks.Helpmech.
In older cars a relay or flasher switch was used for signals and hazards. These were round and typicly located in the fuse box under the drivers dash. Your car will probably just have a relay controled by the computer. The relay will be in the drivers fuse box. The turn silgnal switch may also be your problem. I hope this informaiton helps.
The Hazard and turn signals share the same relay module located in the dashboard behind the hazard switch. Remove the trim by prying from the sides (Either side of the Cup holder drawer and Card drawer). Pry the hazard switch assembly out from the dashboard. The relay is part of the hazard switch assembly.
Unclip the wiring terminal from the relay. replace with appropriate relay. Part costs under $50.00 delivered from Import Parts Specialists.
The Buick Century uses separate relays for the hazard warning and turn signal functions. The turn signal relay is located on the accelerator pedal bracket, and the 4-way flasher relay is located on the convenience center near the left kick panel. Try switching these two relays with one another to see if your turn signals work instead of your 4-ways.