Passlock System

[ponchonutty]

Originally Posted by atxjax

Hi guys,


Newb here trying to figure out my friends grandpa's ( WW2 vet ) 97 malibu with 3.1L Auto, 133K miles.

Car is driving down the road and all of a sudden cuts out. Won't start for about 20 mins. Then starts fine. Im thinking the ignition switch is bad. I did tell him to just use the key itself with no heavy rings on it. This maybe isnt related to Passlock but it could be so I thought id get some advice here.

I have yet to test the alternator, battery cables and clean out the ignition cylinder.

If it is a bad key cylinder anyone have any instructions on how to replace the whole thing?

Start with the switch itself. You won't have to change the keylock, just the switch. Very common on this. Shouldn't be the PK2 system because that won't cause the car to stall out (except when just started).

[raq]

I have a 99 oldsmobile alero. I am having problems with the security light. At first the light would just come on at random, but now, the light comes on each time I try and start my car. The car is no longer starting, and the security light goes on and stays flashing when I try. I've been reading some posts about disabling the system by cutting the yellow wire, but it looks like the car needs to be ON. Is there anyway to disable this now that the car won't turn on? I wish i'd seen this yellow wire thing sooner!! HELP!

[eaglewwit]

My plan on the fix is this:

1. Disconnect the battery
2. Cut the yellow wire
3. Install switch
4. Reconnect battery with switch in on position
5. Start engine and put switch into off position to disable Passlock.

Anyone else done it this way or see any reason not to do it this way?

[ponchonutty]

Originally Posted by raq

I have a 99 oldsmobile alero. I am having problems with the security light. At first the light would just come on at random, but now, the light comes on each time I try and start my car. The car is no longer starting, and the security light goes on and stays flashing when I try. I've been reading some posts about disabling the system by cutting the yellow wire, but it looks like the car needs to be ON. Is there anyway to disable this now that the car won't turn on? I wish i'd seen this yellow wire thing sooner!! HELP!

Get a resistor say about 1500 to 2500 ohms and install that resistor as I've stated before (between the cut yellow wire on the car side and black reference wire) connect a battery charger and try to start your car. Leave it sit for 11 minutes and try it again. If it still doesn't start, let it sit another 11 minutes. This could take up over a half hour to complete but should get you going again.

[ponchonutty]

Originally Posted by eaglewwit

My plan on the fix is this:

1. Disconnect the battery
2. Cut the yellow wire
3. Install switch
4. Reconnect battery with switch in on position
5. Start engine and put switch into off position to disable Passlock.

Anyone else done it this way or see any reason not to do it this way?

If the system is working when you install the switch then it'll work as along as you NEVER let the car's battery go dead or have to unhook it. Also, when the system finally takes a poo, flipping the switch won't turn off the security light. Resistor method usually fixes the problem 99% of the time.

[raq]

Originally Posted by ponchonutty

Get a resistor say about 1500 to 2500 ohms and install that resistor as I've stated before (between the cut yellow wire on the car side and black reference wire) connect a battery charger and try to start your car. Leave it sit for 11 minutes and try it again. If it still doesn't start, let it sit another 11 minutes. This could take up over a half hour to complete but should get you going again.

I'm going to try this. Thank you for the advice, and so fast! Where do I get a resistor? is there a specific type i am looking for? What should i be asking for when i go shopping?

[ponchonutty]

Originally Posted by raq

I'm going to try this. Thank you for the advice, and so fast! Where do I get a resistor? is there a specific type i am looking for? What should i be asking for when i go shopping?

Nope, just any basic resistor at Radio Shack will do or any alarm shop too should have them.

[eaglewwit]

OK, I decided to go the resistor route. Not hard cause the BCM is under the glove box. Here is my issue. I connected the resistor using alligator clips to test. The Security has been on for awhile and not gone away. I must have been in fail enable for some time now. Here is what I did:

1. Disconnected the battery, then the plug on the BCM
2. Installed resistor (2.2k 1/4w) with alligator clips and plugged BCM in
3. Reconnected the battery and the car starts with the light on still even with the yellow wire cut.

Is my problem that I need to get it out of fail enable before attempting the resistor?

Alligator clips not working?

Bad BCM, I don't think so as it has exhibited classic passlock symptons?

Otherwise how can I disconnect the battery in Fail enable mode and reconnect and have it still start. I am very frustrated.

[gordon_gjs]

I am trying to fix my brother in-law malibu and need a few points on what direction to head in. I read thru the post on this thread and I picked up a few thing I need to try.

The car...
2005 Malibu Classic 4 cylinder (4th letter in the vin is a 'N')

The Symptons...
-Car wont start or will start for a brief second.
-I believe the door locks will no unlock/lock on the door switches.
-Remote unlock on remote doesnt work.
-Theft light on or flashing

Could me doing the on/off on/off on/off for 30min reset the issue and solve everything? Or am I looking at replacing some parts?

[ponchonutty]

Originally Posted by eaglewwit

OK, I decided to go the resistor route. Not hard cause the BCM is under the glove box. Here is my issue. I connected the resistor using alligator clips to test. The Security has been on for awhile and not gone away. I must have been in fail enable for some time now. Here is what I did:

1. Disconnected the battery, then the plug on the BCM
2. Installed resistor (2.2k 1/4w) with alligator clips and plugged BCM in
3. Reconnected the battery and the car starts with the light on still even with the yellow wire cut.

Is my problem that I need to get it out of fail enable before attempting the resistor?

Alligator clips not working?

Bad BCM, I don't think so as it has exhibited classic passlock symptons?

Otherwise how can I disconnect the battery in Fail enable mode and reconnect and have it still start. I am very frustrated.

Are you sure you got the right wires at the BCM? Those wires are in different locations on different models so I don't recomend getting them there. At the key is usually the easiest. Also, are you sure you have the resistor on the BCM side of the cut yellow wire? You may have to take the other end of the resistor to chassis ground too.

[ponchonutty]

Originally Posted by gordon_gjs

I am trying to fix my brother in-law malibu and need a few points on what direction to head in. I read thru the post on this thread and I picked up a few thing I need to try.

The car...
2005 Malibu Classic 4 cylinder (4th letter in the vin is a 'N')

The Symptons...
-Car wont start or will start for a brief second.
-I believe the door locks will no unlock/lock on the door switches.
-Remote unlock on remote doesnt work.
-Theft light on or flashing

Could me doing the on/off on/off on/off for 30min reset the issue and solve everything? Or am I looking at replacing some parts?

You can try to unhook the battery and also unplugging the connections at the BCM first to see if that works. You can try to do the BCM relearn but that should only work if the car won't start. If it's running but the light is on, it's in fail-enable mode.

[eaglewwit]

I am almost positive I had the right wires. I followed this:

http://www.bergerweb.net/grandamsecurityfix.htm

[ponchonutty]

yep, that looks good.

[REDVSTORE]

Poncho

I have a 1998 S10 Blazer 4wd and I have a security question. I am quite sure that my PCM is partly bad. Auto headlights don't work right and my trip meter resets back to 0 after about 20 minutes after I turn the key off, and I don't have a security light that comes on at anytime. I bought another PCM and after I installed it my security light comes on and will not start. I went through the re-learn mode with no luck. When I tried to read the resistance through the ignition for the Passlock is shows open. It does not have the keyless feature. What size resister should I put between the yellow & orange/black wire to reset the PCM value for the Passlock? When I re-install the original PCM it starts fine but never get a security light.

[REDVSTORE]

Originally Posted by REDVSTORE

Poncho

I have a 1998 S10 Blazer 4wd and I have a security question. I am quite sure that my BCM is partly bad. Auto headlights don't work right and my trip meter resets back to 0 after about 20 minutes after I turn the key off, and I don't have a security light that comes on at anytime. I bought another BCM and after I installed it my security light comes on and will not start. I went through the re-learn mode with no luck. When I tried to read the resistance through the ignition for the Passlock is shows open. It does not have the keyless feature. What size resister should I put between the yellow & orange/black wire to reset the BCM value for the Passlock? When I re-install the original BCM it starts fine but never get a security light.

My previous post I said PCM and I meant BCM