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The turn signals are controlled by the BCM
Turn Signal Lamps
The body control module (BCM) is responsible for controlling the turn signals and hazard lamps. When the turn signal switch is placed in either the left turn or right turn position, the BCM receives a signal from the turn signal switch. The BCM then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, the BCM receives a signal from the hazard switch. The BCM then will send an on-off voltage signal to all the turn signal lamps. All the turn signal lamps will flash including both IPC turn signal indicators.
I would suspect a problem with the BCM or maybe corrosion in the under hood fuse box . Wires from the BCM to the front turn signals go through the underhood fuse box.
Your best bet ,take it to a qualified repair shop that has a diagnostic scan tool that can read BCM DTC'S - diagnostic trouble codes
DTC B3948 Left Front Turn Signal Circuit
The body control module (BCM) controls the left front turn signal, hazard lamp, and daytime running lamp (DRL). The BCM supplies voltage to control the lighting functions. The BCM monitors the left turn signal lamp supply voltage circuit for proper operation.
DTC B3949 Right Front Turn Signal Circuit
Buy a two pack of turn signal bulbs. Change the front and rear left bulbs and try it out. If you're lucky, you're done and got away cheap. If not, start chasing electrons. Not an overly complicated circuit, the signal is quick flashing because you have an inoperative lamp.
It is as simple as your hazzard switch needs to be replaced yes your hazzard switch as now turn signals are built threw the hazzard switch my PT Cruiser had same problem as my s10 replaced hazzard switch fixed the problem
No - headlight ok. The reason that the Right turn signal blinks fast is that there is half the normal load (resistance) on the right side, since the Right front turn signal isn't working. Since you replaced the Right front turn signal bulb, your problem lies in the bulb socket or the wiring to the socket. (1) try cleaning out the socket - there's probably a contact problem in the socket. You may need to squeeze the contacts together to provide good contact to the socket contact. (2) if contacts inside the socket are ok, try back-probing the socket - to make sure that the socket is getting 12V DC to light the bulb. Replacing a bulb socket is easy, and commonly done. Any auto parts dtore should be able to sell you a new socket - its just a matter of cutting out the old one, and then splicing in the new one. Most shops will use small wire nuts, buried under several wraps of E-tape (electrical tape). (3) if bulb AND socket ok, you have the worst problem known to man - a wiring fault. In this case, you'll want to run a new wire from the flasher module (under the dashboard) to the turn signal.
Usually when the signal is blinking fast it just means the bulb is broken, disconnected, or the wire may have a short or break in it. take care and good luck. Especially if the front one is working.
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