Accidently crossed jumper cables on my 95 buick lesabre has power but wont click or turn over

What did you replace with used or new pcm ? has to be programed . Important:: Replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming
In 95 they used UART serial data pin 9 at DLC a tan wire.No class two yet.

check your postive battery cables that model should have 2 cables at the postive with a spacer between them they are famous to corrrode under the red covers requiring the ends to be replaced or the whole of both to be replaced if corrosion has traveled down into the cables

I think you have your belt wrong. Its turning the power steering pump backward.

You can usually go by the wire colors. The fuel pump relay wires are pink, gray, black, and green with a white stripe. When troubleshooting a fuel pump that is not coming on, the relay is the best place to figure out why. You can pull the relay out and put a jumper wire from the battery to the terminal with the gray wire. If the pump runs, you know that isn't the problem. Then turn the key on and use a jumper between the terminals with the pink and gray wires. If this turns the pump on, you know the ignition switch is sending power to the relay, and the fuse is good. Pull that jumper out, but leave the key on. Push the relay back into the socket, but put a jumper from a ground point to the terminal with the black wire. If that turns the pump on, the ground wire is bad. If not, the PCM is not turning the relay on. Reasons for that may be a bad wire from the PCM, a passlock issue, or the PCM fuse/power wire.

If possible have someone give you a jump next time that happens. If it starts with the jumper cable hooked up then you have a weak battery which isn't supplying enough voltage to the fuel pump and injectors.

connect jumper wires to the negative and positive parts of the harness connector to energize the clutch on the compressor.

Make sure you do not cross live wires as this can cause injury or death some cases.

if it clicks more than likely a jump start will get it going and unless the headlights or other power is left on you might need a battery or alternator also the car is new enogh it will need a direct 12 volt power source for the pcm so if you un-hook the jumper cables and it dies it definetly needs a battery hope this helps

usually always hot. the fans sometimes run for a while even after leaving the car. look for voltage. if there then it/s the heat sensor or it's wiring. if not its the wire,fuse,relay or fusible link as i am not familar with your model

Given the steps you have taken, only one of two things this can be is a resistive connection between the battery and the starter solenoid terminal. Or the battery itself has a bad internal connection. Bear in mind: you cannot crank the engine through the average set of jumper cables unless the battery in the dead vehicle will hold and deliver a good charge. Jumper cables are not really intended to start the car, they are for boosting the good, but low battery in the car being jumped.

98 buick lesabre wont crank with key. When I cross the starter it runs great for 10 seconds and dies.