2002 Impala LS no start sometimes, passlock?

[ck_1500]

Originally Posted by vando002

So did you hook your resistor up to go from the black wire to the little ignition side of the yellow wire or the side that goes back behind the dash?

The resistor goes from the black wire to the side going back behind the dash,
leaving the ignition side of the yellow wire cut and taped.

[vando002]

But you tested the yellow wire going into the ignition?

[ponchonutty]

Yes, you cut the yellow wire and test the ignition switch side. Once you get the code, you put the resistor(s) between the ground reference wire (usually black or orange/black) and the other end of the yellow wire that goes down the column and under the dash. BTW, there's usually 3 wires total with this system. The other wire is white normally but there's nothing you need to do with that wire.

[vando002]

Thank you guys. I will see what I can figure out tomorrow. I've always worked on my own vehicles and can usually figure things out quickly but the electrical system is something I'm very unfamiliar with. Thank you so much for your help!------I went out and tested the system this morning. While the car was running I separated the yellow wire and tested the exposed black wire to the ignition side of the yellow wire while the car was running. With the meter set on 20K, I got a reading of 1.37 and when I switched the leads, I got a reading of 1.17. When I turned the car off and left the key in the "on" position I got the same readings. What size resistor should I get? Does 1.37K mean 1370 ohms?----Out of curiousity, I checked the resistance again with the meter set on 2000. I got a consistent reading of 1308. Would 2-680ohm resistors work?

[cbmcleaning]

I have same problem...sometimes (at the worse time)..my 2003 Impala won't start. Usually the Security light will come on a day or so...or same day when this happens.

What is the FASTEST way to FIX it so that it will just START...???

I don't care if the SECURITY light is always on...or whatever...I just want the care to ALWAYS start....

Thanks
MV

[ponchonutty]

Originally Posted by vando002

Thank you guys. I will see what I can figure out tomorrow. I've always worked on my own vehicles and can usually figure things out quickly but the electrical system is something I'm very unfamiliar with. Thank you so much for your help!------I went out and tested the system this morning. While the car was running I separated the yellow wire and tested the exposed black wire to the ignition side of the yellow wire while the car was running. With the meter set on 20K, I got a reading of 1.37 and when I switched the leads, I got a reading of 1.17. When I turned the car off and left the key in the "on" position I got the same readings. What size resistor should I get? Does 1.37K mean 1370 ohms?----Out of curiousity, I checked the resistance again with the meter set on 2000. I got a consistent reading of 1308. Would 2-680ohm resistors work?

You may have a problem or didn't check it correctly. That value should change from the "on" position to when you crank it. You [i]did[i] find the correct wires??? You also had the cut yellow wire that goes to the ignition switch and not down into the dash correct? Usually what I do is this.... Have the system back together and see if the car will start. If it starts and the security light is off, then I cut that wire and test as stated. If that light is already on and the car is running, it's in the fail-pass mode and it may not show the proper resistance code. If I can't get that light to go out, I sometimes go ahead and check the code and see if it does change when it's just on and when I crank it. If it does change, I'll try to get that value and see if it'll work OK. If I can't get a proper code or if it doesn't change, I'll pick a code that is double that amount and then go into the passlock learn sequence

[ponchonutty]

Originally Posted by cbmcleaning

I have same problem...sometimes (at the worse time)..my 2003 Impala won't start. Usually the Security light will come on a day or so...or same day when this happens.

What is the FASTEST way to FIX it so that it will just START...???

I don't care if the SECURITY light is always on...or whatever...I just want the care to ALWAYS start....

Thanks
MV

While the car is running, cut and tape off the yellow wire ends. Just make sure not to EVER let your car's battery go dead or have to change it.

[vando002]

Originally Posted by ponchonutty

You may have a problem or didn't check it correctly. That value should change from the "on" position to when you crank it. You [i]did[i] find the correct wires??? You also had the cut yellow wire that goes to the ignition switch and not down into the dash correct? Usually what I do is this.... Have the system back together and see if the car will start. If it starts and the security light is off, then I cut that wire and test as stated. If that light is already on and the car is running, it's in the fail-pass mode and it may not show the proper resistance code. If I can't get that light to go out, I sometimes go ahead and check the code and see if it does change when it's just on and when I crank it. If it does change, I'll try to get that value and see if it'll work OK. If I can't get a proper code or if it doesn't change, I'll pick a code that is double that amount and then go into the passlock learn sequence

The car has been sitting in pieces out in the driveway for 3 days. I took the metal piece under the steering column off and brought the ignition switch out under the steering wheel. I found the 3 wires: black, yellow, and white. I don't have a tester that has alligator clips at the end of it so i have to somehow hold the points of the leads on the wires while starting the car. Maybe I just need to buy a tester that has clips so it'll stay in place. But when i have the yellow wires touching, the car does start without the security light on. When the car is running and I take apart the yellow wire, security light comes on. So what I should be doing is testing the resistance while I'm cranking the ignition and while the car is in reverse so it doesn't start? What setting should I have my meter on? I'll go out and try it all again and post back. I just want to make sure this thing starts every time. It's for my girlfriend to commute to school and for her to be stuck up there because it decides not to start would suck. Thanks again for all the help. I hope I can get this soon.....-------OK, just got back in from testing it again. With e-brake on, car in reverse, key in "on" position, 1306 (setting on 2000), crank the key, went up to 1311, then back down. I had bought a package of 680ohm resistors, I just put 2 together, hooked one end to black wire and hooked the other to the yellow wire going away from the ignition, started the car, and no security light! You think I'm good to go with putting this back together or is 1360ohms too much compared to the readings I got??

[ponchonutty]

vando, sounds like you got it!!! Some of these GM cars can handle more of a difference than others. I was told if you are within 5 or 10% of the value, you'd be OK.

[vando002]

Originally Posted by ponchonutty

vando, sounds like you got it!!! Some of these GM cars can handle more of a difference than others. I was told if you are within 5 or 10% of the value, you'd be OK.

funniest thing. I think I have it all figured out. I got outside this morning to start the car, and nothing. Turned it to on position for 10 minutes until security light stops flashing and then it started. I attached the resistors again while it was running. I'm waiting for it to reset again then I'll see if it works before I put it all back together. Good thing I didn't put it back together yet or I would've been pissed!!!

[ponchonutty]

keep me posted!

[vando002]

Originally Posted by ponchonutty

keep me posted!

Once the reset mode was finished I got the car started and put the resistors in place. After taping everything up and putting the ignition back in place I started it to make sure it was still working. Barely started, but that's because I was nearly out of gas, good thing I live across the street from a gas station. Filled it up, drove it to work tonight, just got home, and all the starts were great. I really hope this continues to work. Thank you so much for all the help guys!!!

[ponchonutty]

Yes well you should be good to go then. If you have the same thing happen again, you are probably facing a bad BCM which can also show the same signs.

[fruzer31]

Originally Posted by ck_1500

The only way to put out the light is to put in a resistor. Cutting the yellow wire with the engine running disables the security system and turns on the light. If you didn't install a switch to reconnect the yellow wire and your battery dies or you disconnect the battery teminals, the car won't start anymore, untill it sees the resistance coming from the ignition switch or you wait 10 minutes everytime you start it.

black electrical tape works well also

[Colt Hero]

The option of cutting the yellow wire and installing the switch was not covered completely. First of all, which type switch would be best, and secondly, how would the switch be used? After cutting the yellow wire with the car running and installing the switch (presumably in the OFF position), you would then need to toggle the switch (back ON) whenever the battery went dead or was disconnected ... and then back OFF again?

Another way to ask this question would be: OFF would be the default switch position, but the switch would need to be toggled to the ON position under what conditions? And would it need to be toggled ON, then some action taken, then toggled back OFF, or would it just be OFF-to-ON-to-OFF in succession?