so i have been getting a P1650 and P1651 codes from a scanner talking about the quad block..my dad called the dealership and says that its a bad computer and they go out all the time in these cars





so my question is what year(s) ecu can i use for my 96 automatic SL1

DTC P1650 Control Module Output B Circuit
DTC P1651 Fan 1 Relay Control Circuit


You may have more than one issue with the above trouble codes including a possible faulty ECM but where to begin? Are you having overheating issues that may be due to the radiator fan being inoperative? A quad block reference is to the quad driver circuit that controls four individual electrical circuits such as the fan relay, a/c relay, EGR valve, and evaporative canisterrelay. Only one of these individual circuits has to be in error for some reason to trigger a trouble code. The two codes above may be for the same problem, a fan relay not working or missing. The last item, the ECM/PCM may be working properly but without more info it would be just guessing. There may be used ECM/PCM'savailable at your local junk yard for less costs than buying new beside the fact that ECM/PCM's rarely fail when most likely its the sensors that are electrically connected to them that causes engine problems.

the a/c doesnt work power windows sunroof and fan relay does not work





would that mean a new ecm pcm or ecu?





thanks for your help ducky!!!! its getting hot and my newborn can not withstand these temperatures

Go over to saturnfans.com and post your questions in the S-series forums, you'll receive more support there. If you decide to become a member it will help to add your car info as part of your profile so it won't need to be manually typed every time you ask for assistance.


ECM/ECU/PCM all mean the same, the electronic engine management system or EFI system controlling the engine and emission control system. The a/c is a very complicated system by itself and should be last on your list as much as you'd like a/c when the weather turns hot unless you're willing to turn to a pro for proper repairs, whatever they may be. The fan relay not working may be due to the infamous engine coolant temperature sensor (ECTS) failure. Its a two-wire sensor that is resin tipped, prone to cracking, and should be replaced with the brass one. The two-wire connector may be corroded and needs to be replaced if necessary.

It is very highly UNlikely the the PCM is bad. I have never heard of one instance where a PCM has actually gone bad on these cars.





Sounds like you have a fuse/relay issue or a connection issue at one of the fuse blocks.