It is your transmission control unit (TCU) This is located under the passenger rug next to the main computer. I just purchased a reconditioned TCU for my 91 accord from an ebay seller called allcomputerresources. If he does not list a 91 accord TCU, then contact him to see if he can get one quickly. He will send it, and then you send the old one in as a core. My unit is running fine, and costs considerably less than from a dealer.
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Try replacing your battery as it sounds like your battery is not holding charge. When you get a boost from other car your using the other cars power to start yours. It only takes a little power to light dash lights etc but takes a LOT of power to start motor.
It sounds like you have a bad engine or body ground. Check all of your ground circuits. The tail lamp circuits on Toyotas are "riveted" in place in the plastic housings. I have fixed many of them by drilling a small hole all the way through the housing and installing a small bolt and nut for the ground. (This is most likely what is causing your dash light problem)
For the stalling problem, you need to check your charging system. You should not have to jump start if your charging system is working. Be sure all connections are clean and tight.
check along bottom edge of dash cover for screws, sometimes there are a few at the top as well...generally once they are removed the dash face will pop off with moderate pulling. Once off, you can access the light switch easily. (you may need to remove the lower cover to locate dash screws)
look for the a/c relay located (likely) in the fuse panel in the engine compartment near the battery. if it's not there let me know and i'll find out which relay it is. incidentally there may be fuses blown as well and replacing them may bring back your dash computer as well... i believe there are also fuses/relays located in the trunk as well on BMW's.