OK, so I have a very strange issue happening with my car. I'll go to start the car, I'll wait for the BCM to properly boot on Key on Engine off, and then sometimes when I go to crank the engine over, it'll crank a couple of times and then the car will completely lose all electrics, and I won't be able to remove the key. Sometimes the car takes about a minute to reset. Other times, the car takes hours to reset. And also, at night, when the car is running, all the lights, in and out, flicker like crazy. It's worse in stationary gears than mobile gears. I do know that the positive battery cable is going bad. Could that, combined with a bad engine mount, be causing the no start issue?
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Your brake interlock is not working properly. Do your brake lights work? There is a switch at the brake pedal that tells the computer your foot is on the brake and to let you shift gears. When working properly you can hear the click by your shifter when you step on the brake. If you don't hear the click you need to troubleshoot the system to see which part is not working properly.
I had a car that did that to me, turned out to be the battery. It was getting old and needed replacing. You could clean the contacts for the battery as well, might help a little. My car ran for a hour or more but if I stopped and tried starting shortly after I was toast. Had to wait 45 min. or more to start. Hope this helps.
Any PCM, BCM, or ignition switch assembly that's replaced requires what's described as a Passlock re-learn procedure to synchronize the three subassemblies for proper operation. This either takes place at Saturn or during a 30-minute DIY procedure in three 10-minute cycles. The procedure is basically to leave the ignition ON for 10-minutes, cycling the ignition OFF and then ON for another 10-minutes and once more until repeated three times, never starting at any time. After the third cycle the ignition can be turned to start the engine to confirm that all components have successfully been synchronized. A failure to start means an incorrect re-learn procedure was done and needs to be repeated all over again. The security light will flash during the process and eventually turn off altogether as indication of successful re-learing security codes for any new part replaced. What isn't changed are the VIN and mileage that Saturn equipment can do. The security system is divided into three parts; the ignition switch sensors, the PCM, and the BCM. Any one of these subassemblies being replaced requires the BCM to relearn the new replacement part otherwise you'll just have a dead engine unable to run. New BCM's come as blanks that Saturn address' with their Techtool II with VIN and mileage copied from the failed BCM. 'Field' BCM's removed from vehicles still retain VIN and mileage that can only be changed by Saturn. There may be other programmed accessories that have to considered to be compatible to the original one removed for replacement.
key remotes
Replacing the BCM will require the remotes to be reprogammed. The problem is that you need a scan tool with the proper software to perform the programming. Here is the procedure for reprogramming if you have access to a tool. If not you should put a call into a local garage that does diagnostic work or the dealer. If it were just a battery change you could resync without programming.
You'll have to figure out if it is a fuel or ignition problem. Is the check engine light on ? Have you checked for trouble codes ? It could be a relay, the ignition module, coil, or a list of other things. Even the fuel pump. If this is a vortec V6 it takes at least 60psi to cover the injectors.
i'me asumeing the batt is ok....turn on lights, do they dim when you try to start engine? if not .bad selonoid on new starter..was it rebuilt? it happens. Billy Starr
It sounds like you have an issue with your PassLock security system. I had the same with my 2002 Impala. Key turns OK, but won't start, won't crank. Wait 20-30 minutes, and car starts normally. There is usually a clue from the Battery and Security lights.
The problem starting to happen once a month, and eventually 1-2 times a week.
There are several write-ups on this problem for several GM cars for 2000-2006(?). Search this website, and search the web.
The official solution is to replace the ignition switch. The best solution is to bypass the Pass Lock system. I went ahead and did a full bypass, which involves cutting wires and adding resistors to the ignition circuit. I have not had a problem since.
A used body control can be used in a vehicle other than the vehicle it was installed in. the body control module when first installed is programmed with the vehicle vin number. the vin number can not be changed was it was written to the BCM. the oprions can be always change in the BCM but not the VIN number. basically the used bcm you have installed has the vin number from the vehicle was installed in, now the vin number in the used BCM doesnt match all the other control modules
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