Passlock BCM problems

[Freedominco]

Hi thanks for looking at this thread
I have a 2004 Grand Am for the last 4 years for about the last year it would give me problems every once in awhile starting, I would turn the key and nothing would happen, I could hear the fuel pump prime but starter would not activate. I knew nothing about passlock until a few days ago so I would just keep trying and eventually it would start. About a week ago the car would not start no matter what so I ordered a new ignition cylinder and installed it with no problems, read online about the key relearn process and the new key started to work after just one cycle of 10 minutes but the security light and service vehicle light were both on whenever the car was driven my headlights would now only work when I turned them on and before I always just kept them on auto my door locks also stopped auto locking and unlocking when shifting into drive and park. I only drove it a few times and a couple days ago I went to start it and it wouldn’t start, turn the key and nothing just like before and everything I tried I couldn’t get it to start, my battery was also dead for some reason. I tried to get the car to relearn the key but the security light always stays on no matter how long I leave it in the on position. So I ordered another ignition cylinder thinking maybe I got a bad part but same issue the security light never turns off for it to relearn the key. I took the BCM off to see if there was an obvious problem but it didn’t have a ton of corrosion and is not filled with water. So I noticed that the yellow wire from the BCM to the passlock sensor should have 5 volts and the white wire should have 12 volts but neither wire have any voltage no matter what position the key is in. I’m thinking I need a new BCM but not sure and since I have to order one and it can’t be returned once installed I wanted to see if anyone had any ideas or if I should be looking somewhere else as to why there is no voltage through the 2 wires ???

 

[melsg5]

You state the battery was dead, then no further information about that until 0 volt readings at sensor?
If you read owners manual page 2-17, Passlock disables fuel not starter.
What is the battery voltage?
Have you checked for blown fuses?

 

[Freedominco]

Battery was dead for some reason, battery is less then a year old, I unhooked it from the car, cleaned up the terminals and put it on my charger over night the battery now puts out 12.8 volts. I have correct voltages at the starter but the passlock wires have no voltage. Like I said I never even knew about passlock or any sort of GM security until recently but I do know the passlock system on this Pontiac disables the starter not the fuel, when it wouldn’t start before I could always hear the fuel pump prime but I would get nothing when I turned the key, I would keep messing with the key and I could get it to start, then when it finally completely gave out and I got the new ignition and I did the relearn the car never briefly started and died I just turned the key to start for a couple of seconds left it in the on position for 10 minutes, the security light went out I turned the key to off and then the car started. My friend has a hummer and every few days he will go to start his car it will start for a few seconds and then die and he has to leave the key in the on position for 10 minutes to get it to restart so obviously his gm security kills the fuel but that’s not what this Pontiac does it kills the starter.

 

[melsg5]

Not sure why you insist Passlock kills the starter since your owners manual and articles on the system says it disables fuel.

General Motors Vehicles Equipped with PASSLock

The PassLock system was designed to prevent vehicle theft by disabling fuel to the engine if attempts are made to start the vehicle without the correct bitted key.

www.locksmithledger.com

Before you did anything and it wouldn't start, did the security light come on?
Did you ever consider a bad starter relay?

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[Freedominco]

Not sure why you insist Passlock kills the starter since your owners manual and articles on the system says it disables fuel.

General Motors Vehicles Equipped with PASSLock

The PassLock system was designed to prevent vehicle theft by disabling fuel to the engine if attempts are made to start the vehicle without the correct bitted key.

www.locksmithledger.com

Before you did anything and it wouldn't start, did the security light come on?
Did you ever consider a bad starter relay?

I’m not insisting, I miss spoke, like I said I never had and experience with vats, passlock until recently and others have said the starter thing. And yes I first thought the relay so I switched out the starter relay with the relay next to it, for the cooling fan I think. All my problems started after I changed out the ignition cylinder and is it not odd that I don’t get any current one the 3 wires for the passlock sensor ?? I’m thinking that’s why I can’t get the car to relearn the 2nd replacement ignition cylinder right ?? I thank you for the help and taking the time. I’m willing to try, test check anything that anyone can think of that will get me going again. Once again thank you

 

[Freedominco]

Not sure why you insist Passlock kills the starter since your owners manual and articles on the system says it disables fuel.

General Motors Vehicles Equipped with PASSLock

The PassLock system was designed to prevent vehicle theft by disabling fuel to the engine if attempts are made to start the vehicle without the correct bitted key.

www.locksmithledger.com

Before you did anything and it wouldn't start, did the security light come on?
Did you ever consider a bad starter relay?

Yes before I did anything to the ignition when no matter what I tried with the key and couldn’t get it to start the security light came on steady, so I got the new ignition cylinder and installed it and since then the light has been on, never flashing just on, it did turn off after the 10 minute relearn and it will turn off for a few seconds if you just turn the key to on/run but it comes back on. Thanks for your help I appreciate it.

 

[melsg5]

See if this information helps

Grand Am Passlock Security System Repair

How to repair the 2002 Pontiac Grand Am Security System

www.bergerweb.net

 

[Freedominco]

See if this information helps

Grand Am Passlock Security System Repair

How to repair the 2002 Pontiac Grand Am Security System

www.bergerweb.net

I was thinking about trying the by pass with the resistor but since I don’t have any voltage running through the wires I didn’t think that would help but I will try it. Thanks

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[Floyd1000]

I was thinking about trying the by pass with the resistor but since I don’t have any voltage running through the wires I didn’t think that would help but I will try it. Thanks

I have a problem also with the starter voltage to the selenoid. No power to the wire to kick the selenoid in. I can do it with a screwdriver to cross it and the starter kicks in but not with the key. I wonder where i look now to know why there is nothing being sent from the key start position to the selenoid. Anybody know? My security light stays on constant. All my guages work, lights work except turn signals do not come on. Fuel pump activates when i turn the key to start. No power from the key start to the selenoid right now.

 

[melsg5]

Your security light is on is why it doesn't start.

 

[Floyd1000]

Your security light is on is why it doesn't start.

I got the security light to go out but i still do not have any crank.
What triggers the start sensor relay in the BCM so that current can go to the starter relay? I have done the bypass but security light is steady on and off after a few minutes and i try to start but no crank at all.

 

[Floyd1000]

The starter relay no. 11 in fuse box under the hood has a yellow wire going to the PCM or Powertrain Control Module which also senses crank voltate off the PNP Switch. I hope this helps those that think the PCM allows the starter relay to engage without input voltage to the coil in the PCM. I wish i knew how to override the PCM starter relay coil control to just engage without having other sensor ohms to engage it. I guess you could open the box and fuse it so that when it got voltage it would already be closed which would allow the starter relay to work as it should without security.

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[Floyd1000]

Hi thanks for looking at this thread
I have a 2004 Grand Am for the last 4 years for about the last year it would give me problems every once in awhile starting, I would turn the key and nothing would happen, I could hear the fuel pump prime but starter would not activate. I knew nothing about passlock until a few days ago so I would just keep trying and eventually it would start. About a week ago the car would not start no matter what so I ordered a new ignition cylinder and installed it with no problems, read online about the key relearn process and the new key started to work after just one cycle of 10 minutes but the security light and service vehicle light were both on whenever the car was driven my headlights would now only work when I turned them on and before I always just kept them on auto my door locks also stopped auto locking and unlocking when shifting into drive and park. I only drove it a few times and a couple days ago I went to start it and it wouldn’t start, turn the key and nothing just like before and everything I tried I couldn’t get it to start, my battery was also dead for some reason. I tried to get the car to relearn the key but the security light always stays on no matter how long I leave it in the on position. So I ordered another ignition cylinder thinking maybe I got a bad part but same issue the security light never turns off for it to relearn the key. I took the BCM off to see if there was an obvious problem but it didn’t have a ton of corrosion and is not filled with water. So I noticed that the yellow wire from the BCM to the passlock sensor should have 5 volts and the white wire should have 12 volts but neither wire have any voltage no matter what position the key is in. I’m thinking I need a new BCM but not sure and since I have to order one and it can’t be returned once installed I wanted to see if anyone had any ideas or if I should be looking somewhere else as to why there is no voltage through the 2 wires ???

Maybe this will help out some. Need some more help maybe i can but not sure. I too want to close some security loops in the intellgent by pass design.

 

[Floyd1000]

Hi thanks for looking at this thread
I have a 2004 Grand Am for the last 4 years for about the last year it would give me problems every once in awhile starting, I would turn the key and nothing would happen, I could hear the fuel pump prime but starter would not activate. I knew nothing about passlock until a few days ago so I would just keep trying and eventually it would start. About a week ago the car would not start no matter what so I ordered a new ignition cylinder and installed it with no problems, read online about the key relearn process and the new key started to work after just one cycle of 10 minutes but the security light and service vehicle light were both on whenever the car was driven my headlights would now only work when I turned them on and before I always just kept them on auto my door locks also stopped auto locking and unlocking when shifting into drive and park. I only drove it a few times and a couple days ago I went to start it and it wouldn’t start, turn the key and nothing just like before and everything I tried I couldn’t get it to start, my battery was also dead for some reason. I tried to get the car to relearn the key but the security light always stays on no matter how long I leave it in the on position. So I ordered another ignition cylinder thinking maybe I got a bad part but same issue the security light never turns off for it to relearn the key. I took the BCM off to see if there was an obvious problem but it didn’t have a ton of corrosion and is not filled with water. So I noticed that the yellow wire from the BCM to the passlock sensor should have 5 volts and the white wire should have 12 volts but neither wire have any voltage no matter what position the key is in. I’m thinking I need a new BCM but not sure and since I have to order one and it can’t be returned once installed I wanted to see if anyone had any ideas or if I should be looking somewhere else as to why there is no voltage through the 2 wires ???

Maybe this can help some.

 

[Floyd1000]

Well, found out the little small yellow wire to the PCM allowed the relay to work and it cranked. The wire was cut and some one at some time put something in between the wires that was cut. I tied them together again and it cranked but will not start, no spark at the plugs, fuel pressure is ok but i do not know if the injectors are firing. I will have to investigate more to find out how to get the spark to the plugs through the coil. Any ideas, send them my way.

 

[Floyd1000]

I have a problem also with the starter voltage to the solenoid. No power to the wire to kick the solenoid in. I can do it with a screwdriver to cross it and the starter kicks in but not with the key. I wonder where i look now to know why there is nothing being sent from the key start position to the solenoid. Anybody know? My security light stays on constant. All my gauges work, lights work except turn signals do not come on. Fuel pump activates when i turn the key to start. No power from the key start to the solenoid right now.

The small yellow wire was cut in half to the PCM so i tied it together and i had it to crank from the key. Now, no fire to the plugs and that i guess means no fire to the coils which gets their input to fire from somewhere else in the line.

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