Passlock System

[knilive2]

I wanted to thank tech II for your help on my Malibu. I done what you told me on the relearn process n switch the toggle switch and she started after maybe 2months of sitting. We need more people like yourself around. Thanks again

[Tech II]

You're welcome...that's what we are here for.....

[Amber Callen]

Hoping to find a solution. Here is my story. Had many issues with passlock on my 97 grand am. In June of last year my brother did a bypass (something behind the radio I believe). Car has been great until recently. First I came upon an issue removing my key. Car would shut off but not fully back. Found online about the manual release button under the panel under steering wheel. A few weeks later I began having passlock issues again. Once or twice a week I would go to start and none of my instrument cluster lights or gauges would come on and I knew this meant the normal start and stall. But thankfully it would last just a few seconds and everything would pop back on and car would start. This week on Monday I left a store to find that same issue except this time nothing happened after a few seconds. Attempted to do a relearn and still no go. All I managed to do was kill the battery. Left it overnight and went back to it the next morning. After jumping the car and several attempts to start followed by just turning key back and forth it finally came to life. Later that night it started right up. Drove down the road target gas and once again no start. My brother came and again we jumped battery (tried to do relearn while waiting on him). Still nothing. He disconnected battery for 30 seconds and then cleaned the fuse for the instrument cluster and car was ready to go. Worked for about 5-6 starts then again today left me stranded. Bought fuses hoping that was the issue but still nothing. Tried disconnecting battery and nothing. Now we are at a loss. My brother says the bypass should be keeping it from passlocking but clearly that's not working unless there is something else that could be the issue. Can't afford a new car so I need to repair this one. Hoping to avoid the dealership. Any suggestions???

[aleekat]

If your security light is NOT flashing, I would guess bad ignition switch.

[Tech II]

Not sure what kind of bypass you used, resistor or toggle switch, but in either case, they would have nothing to do with your dash lighting up.....

When you turn the key to on, and the dash doesn't light up, check all your fuses for power......if several have no power, I would be leaning towards the ignition switch....

[Amber Callen]

Did a resister bypass. Replaced the fuses to the instrument cluster last night and the cluster still isn't coming on and car is still starting and dying. I did notice that I didn't start having any passlock issues again until I started having issues with the key not turning back to off unless I used the manual release button on the bottom of steering column. I'm hoping it's just the ignition and hopefully an easy enough fix and I won't have these leaststawhile

[ponchonutty]

Yes it sounds like it would be the ignition switch itself. Now I did work on a '97 Malibu (same system as yours) that was previously bypassed using resistors. Ended up tracing it down to a short inside the instrument cluster. On these sytems, they use a "bulb check" system through resistance that's also tied into the PK2 system. Swapped out the cluster and it's been fine now for over a year.

[Amber Callen]

Ignition switch was replaced at dealer and car was great for a few weeks. Now it is continuing to passlock every couple of days. Usually starts after a 10 min relearn but just waiting for it not to here soon as its done before. Really wish I could fix the problem. I am afraid to go anywhere especially with my kids because I don't want to get stranded.

[Tech II]

If it takes a 10 minute relearn to start the car, that resistor bypass was either done wrong, or something is wrong with it...

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[jumpingjoe]

I have a 2003 Chevy Cavalier that has not ran in over a year due to anti theft system I believe. Everything seems to work as far as radio, door locks, key fob, etc.. But the car will not start. I used the procedure for the 10 min with key on but the lights on the dash never did go out but still stayed on, antitheft light. When I hook up a scan tool, Actron CP9580A, it tells me no modules present. I tested the grounds circuits at dlc and they where good. Also tested the circuit 1807 for continuity. From the C100 connector to the PCM resistance was 1 ohms so I am going to replace, splice, a section of the wiring from the pcm to the C100 connector. I had also previously replaced the PCM that was freshly programmed. No fuel pressure, engine turns over, compression on all cylinders 175, antitheft light always on solid. If I jump the relay I can get fuel pressure but still no start. Any ideas? I know if I get this thing going I want to disable the passlock for sure.

[ShadeTreeJack]

if it is the passlock problem the car will start for about 2 seconds, then quit and the "Security" light will flash. If this is the case, you need to run through the key-on for 10 minutes routine 3 or 4 times. It was 3 times for my 98 Malibu. I tried that on an 04 Impala and drove myself to boredom before I looked it up and saw that for the Imp it is four times.

dash lights should all be on when key is on but engine is not running - that is how you check the bulbs. On but not flashing.

If you don't get a 2 second start and the security light flashing, we need to look elsewhere. I see that you have done some checks. The no modules present is a good clue and I see that you are chasing grounds and other wires.

Are you getting a spark?


You say that you previously replaced he pcm. Did it run ok when you did that?
Make sure the pcm pins are not bent, not corroded and that the connector is well seated. ( When my Camaro sets random codes, I check the connector and it seems ok for a while. Then things like driving through over a foot of water in Detroit last night makes all kinds of codes come up)

Give us an update when you run the new wires and check for spark, etc

[jumpingjoe]

I purchased a programed ecm as I didn't have fuel pressure or spark. The ecm was programmed using the vin number. I still do not have spark or fuel. My wiring to the spark controller is good. All my lights come on the dash good. The Theft light does not flash but stays on whether it is 10 min or 30 min or 1 hour no change. Replacement wire will be here tomorrow I had to order. Kind of a stickler for correct wiring color.

[jumpingjoe]

Replace wire to pcm. Still no change as of condition. Here is what I see. Lights that are on after trying to start car. On the right side the Trac off is on, On the left side of the dash the following is on; Check gages, theft system,service,and brake. Note the parking brake is applied.

Using a diagnostic tree for the symptom of no engine module found as my scan tool must find this to proceed to find another module. It told me, a diagnostic tree, to check ground for pin 5 of the DLC. I had put a extra ground into the circuit to ensure ground, but when I checked it again it had a 60 ohm resistance. so I starting tracing the lines down to eliminate how am I getting high resistance. When I remove the light blue connector from the BCM then all the resistance dropped down to .3 ohms. I removed the bcm and inspected the internal circuits and could find nothing out of place as far as heated circuits.

Remember whether it is 10 20 or 30 minutes the lights never change in their appearance in order to relearn passlock. There is no spark and the fuel pump does not run when you first turn the key on either.

Should I remove the ground circuit from the BCM and the DLC and tie them into grounds seperately? That way they do not affect each other? Or is the problem the BCM will need replaced? And if so does it have to be a new one only? $$$$$$

[jumpingjoe]

The wiring did not need repaired as there was no resistance in the lines. I replaced the ignition switch with a new passlock sensor. The learn procedure went as it should but when done the theft light came on and stayed on. Still no spark or fuel pressure at any time.. Totally at a loss ..