2000 ignition cylinder

[MrAbody]

My mother has a 2000 impala which I believe has the passlock 2 in it. From what I gather there are 3 major components to the passlock system malfunctioning and experiencing the no-start condition with the ‘Security’ code on the display.

The Ignition switch : 22670487, the ignition cylinder : 12458191 and the BCM : 10350647

I have seen the posts on bypassing the passlock with a toggle switch but
I was thinking of replacing the ignition cylinder (12458191) first to see if that is the problem.

After I physically replace it is there anything I have to do to ‘program the car’ to recognize the new cylinder? Will I need to get a new key cut for it? If I have to do a key relearn, could anyone post instructions on doing that?

Thanks in advance!

[raycorri]

This stuff should help a bit. Notice that the bad terminal connections at the BCM still include the 3 Passlock wires. (Yellow,Black and White) These wires are tiny and therefore easily broken also. Many people mistakenly replace the BCM, Ignition Lock Cylinder, or the Instrument Cluster--- when the ultimate problem is with these tiny wires. It can take quite a while to really narrow down the real problem since many different codes can be thrown at you. Good Luck and hope this will help.

No-Start or No-Start/No-Crank complaints
can occur for multiple reasons. However, one
of the reasons can be a shorted Class 2 bus.
Vehicle Theft Deterrent systems utilize the
Class 2 bus to communicate security
information between various controllers. For
instance, the BCM will get information from
the Passlock module and then communicate
with the PCM to allow or disallow fuel
delivery and/or starter enable.
When the Class 2 bus is shorted to either
ground or battery voltage, the controllers are
unable to communicate with each other. This
is because the voltage on the line is held
static at either ground or B+. The Class 2
message toggles the voltage on the bus
between 0 and 7 volts, but when the bus is
shorted, the toggling cannot take place.
Because the voltage remains static at either
ground or B+, the Class 2 message can't be
sent or received.
Without these Class 2 messages being
sent and received, the PCM won't get the
proper security messages which would
normally enable fuel and/or starter enable
and the customer will have a No-Start or No-
Start/No-Crank complaint.
TIP: If the problem is intermittent,
remember to search for the U1300 - Class 2
Data Link Low, and U1301 - Class 2 Data Link
High--in "History". This will help determine the
source of the problem.


http://members.troublecodes.net/crunch/01impala.pdf

http://members.troublecodes.net/crunch/Impala%20.pdf


Ray

Proud Member of The Anti-Passlock Club