Jim Grant's Tech Tips
'99 Chevy Blazer, No Keyless Entry
Q:
I have
a '99 Chevrolet Blazer and the other day the keyless entry quit working.
My Power locks are still functional along with power windows. I have replaced
the battery in my transmitter and checked all fuses. My question: is there
something I could do to check this out before taking the vehicle to be
repaired??
A:
Once the battery gets
low or is removed from the transmitter it must be re-synchronized with
the vehicle system to operate. Also if the battery in the vehicle is dead
or disconnected for an extended period of time it will need to be resynchronized
as well. The transmitter for most of todays vehicle's does not transmit
the same signal/code twice in a row. It is best described as a rolling
code that changes each time the transmitter sends a signal to the vehicle's
receiver. The two components work together in this game to prevent anyone
from recording the transmission data (which is easier than you can imagine)
to unlock your vehicle for their inspection. To resynchronize the transmitter
to the receiver, stand about 5 ft from the vehicle. At the same time press
and hold the lock and unlock buttons of the transmitter for about 7 seconds.
The door locks should cycle to confirm the transmitter and receiver are
back in the game. Note; this does not work with other systems; each manufacturer
has their own idea of how the game must be played when it comes to resynchronizing
transmitters.
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