Help Passlock Issue?

[Iflylow]

Regards reprogramming a BCM: The BCM in the Impala cannot be reprogrammed. I don't think GM would make one reprogrammable for the Alero and not for the Impala, but maybe they did. Better ask a dealer to be sure.
Have you tried checking for continuity through you new ignition switch as the key is turned to the various positions? Maybe power is getting to the switch but the switch itself was bad when you got it.

[caspianb79]

I tested switch continuity with the switch removed, as it was damn near impossible to do with it installed.

Neither the old switch, or the the new switch matched all of the continuity tests that the Haynes manual specified, not sure why. But the old switch and new switch had the sam continuity results. Seeing as how the dealer said it was the cylinder and not the switch, I imagine the switch should be fine.

I've tested continuity with the old cylinder and old switch, new cylinder and old switch, old cylinder and new switch, new cylinder and new switch, with the same results for all combinations. I am completely dumbfounded here.

[ponchonutty]

well unfortunately it sounds like a trip to a dealer or a good private mechanic with a tech2 tool.

[caspianb79]

Originally Posted by ponchonutty

Ahh, are you anywhere near central Ohio? I could take a peek at it. Are you sure you tested each ignition and accessory wire at the switch? You'll have 2 of each plus 2 red constant feeds and one yellow starter wire. Test these and report back.

just wanting to make sure I'm testing right, what is the proper way to test each wire?

I was using a multimeter, touching the red end to the wire/connector and the black connector to another wire in the connector.

[ponchonutty]

Originally Posted by caspianb79

just wanting to make sure I'm testing right, what is the proper way to test each wire?

I was using a multimeter, touching the red end to the wire/connector and the black connector to another wire in the connector.

Well, depends on what you are testing. If you are testing for voltage, the black lead goes to chassis ground and the red to what ever circuit you are testing.

[caspianb79]

turns out I was only getting about 4 Volts to the hot wires running to the switch. I cleaned the battery terminals and that sorted things out. I'm getting power everywhere now.

Now it is a question of is it just the BCM that needs to be replaced or the Lock Cylinder or both.

I'm under the opinion that there is nothing wrong with the Lock Cylinder as it passed the same continuity tests as a new one along with a new switch.

I imagine my last short out episode can be attributed to the dirty terminal connections on the battery.

Any thoughts on whether it is just the BCM or Lock Cylinder or both?

Thanks.

[ponchonutty]

Well I'd hate to say with out seeing it in person. Since now you have good juice you may want to put a charger on it and then take the car through the learn sequence for a new code on the PK2 system.

[caspianb79]

Is the PK2 system something the dealer has to run on it?

If so, I take it the recommendation would be have the system relearn after having power issues, then re-test the integrity of the BCM and Ignition Cylinder by the dealer looking up trouble codes?

Thanks

[ponchonutty]

Originally Posted by caspianb79

Is the PK2 system something the dealer has to run on it?

If so, I take it the recommendation would be have the system relearn after having power issues, then re-test the integrity of the BCM and Ignition Cylinder by the dealer looking up trouble codes?

Thanks

PK2= Passlock 2 antitheft system. What's got me concerned is this BCM has Data Loss code B2958 in memory. Which usually means you have a bad BCM. If the BCM is acting up it'll cause the PK2 system from starting your car. Find the BCM and wiggle the connectors on it to see if that helps. You can also disconnect the BCM and plug it back in to see if that changes anything as well. You said you replaced the BCM so is this code before or after? Either way, you'll need to teach the BCM your car's PK2 code by doing the 10min on/off deal.

[caspianb79]

When I had attempted to use the replacement BCM, the vehicle was not getting enough power due to the dirty terminals on the battery.

By the time I re-established power, the original BCM was installed. It was exhibiting the same problems with the Passlock system prior to to power loss. I attempted the 10 minute re-learn 3 times with the original BCM and it did not fix the problem.

Are you saying it should be possible to have my replacement BCM learn the cars PK2 codes by attempting the 10 minute run without taking it to a dealer?

If so, I'd like to attempt to save money in towing.

[Iflylow]

Yes, that's what he means. Look in your owners manual for the exact procedure, if you don't already know it. I would try it with the least worn key you have, as that sometimes helps. Good luck!

[ponchonutty]

Yes, you could try it. I'm not totally sure but it's worth a shot. No, the relearn procedure isn't in the manual.

[Iflylow]

Originally Posted by ponchonutty

Yes, you could try it. I'm not totally sure but it's worth a shot. No, the relearn procedure isn't in the manual.

You're right, I was thinking of something else.

[purple.guru]

Did you get it fixed???? I have some information about running a toggle switch in the dash (don't remember all of it) but that information is at work. I'll send it home and re-post just in case it might help...

[purple.guru]

Did you get it running???