We are a team of ASE certified mechanics that have created this guide to help
you save money while doing the job yourself, or at least see what you are paying
for when having the job done at a shop. Turn signal indicators or blinkers as they
are called work in a specific manner which is dictated by the
turn signal bulb and circuit
How Does It Work?
A BCM or flasher unit is incorporated into the turn signal system and is used
to momentarily interrupt the circuit to create the blinking action. This system
works on the resistance normally present in the lighting system.
What Goes Wrong?
On older vehicles a turn signal flasher is used to control the blinking intervals
while newer systems use a
BCM (body control
module). When the system resistance changes either by a missing or burnt out bulb,
blown fuse or corroded connection the blinkers will cycle more rapidly.
Let's Jump In!
Turn the key to the on position, push the turn signal switch in the direction
the system blinks fast in, right, left or both.
Inspect both the front and rear of the vehicle to identify a directional
signal bulb failure, remove the lens or gain access to the rear of the lens
and remove the turn signal
Once the bulb has been replaced check the blinker operation which should
return to normal, then reassemble. It is a good idea to add dielectric
grease when replacing the bulb, this stops corrosion.
Sometimes the bulb can be good and electrical corrosion is the problem.
When the bulb is removed, inspect the electrical connector terminal condition,
if a slight amount of corrosion is present it can be repaired using electrical
connector cleaner and a small wire brush or Exacto knife. If excessive corrosion
is present the connector must be replaced as in the example below.
If all four turn signals are blinking quickly
check the fuses on the BCM or
fuse panel, if your vehicle has a turn signal flasher unit, replace it. If exact
fuse or BCM locations or procedures are needed you can
ask our experts to supply you with the information
(free), or consult an online resource such as AllData DIY (pay).
If everything seems to be working correctly a
CAN scan (Controller
Area Network) can be performed which can help pinpoint the problem as in a
or a TIPM issue in Jeep and Chrysler products.