What happens when you disconnect a battery from a car?
When you disconnect your old battery from the car, you wipe out your car’s settings unless you keep the voltage in the car going. You want to keep a back current flowing to your car to retain its computer settings.
What does it mean when a VW battery wont start?
First, you want to find out if the immobilizer is the problem. To do this, turn on the battery in your Volkswagen and see if the immobilizer warning light is flashing on your dash, most likely in your speedometer. It should look like an outline of a car with a key inside it. If it’s flashing, it means the immobilizer’s disconnected from the system.
What to do if your car wont start after a battery replacement?
Hey, anything can happen. There’s a (miniscule) chance your replacement battery is toast. You can take it to an auto parts store and have them test it. Keep in mind that this problem is likely only if your car isn’t turning over at all. We hope this guide has helped you!
Why is my Check Engine light not working?
I wanted to reset my check engine light to see if a problem I think I fixed resurfaces, so I disconnected my negative lead from the post. When I reconnected the lead the car refused to start. Occasionally it will click for a few seconds when I crank, and then there is nothing.
What causes a car to start after disconnecting the battery?
Click to expand… Weak battery and poor connection at the terminals (dirty, corroded). That ‘click’ is very telling. Take the clamps off, clean the posts and the clamps with a wire brush, snadpaper or whatever and put it all back together. Speaking of corrosion, that sh!t is like cancer in the way it spreads.
Why do I have to disconnect then reconnect the battery?
By disconnecting and reconnecting the battery it doesn’t work every time but maybe after 5 or so tries. I have been pulling fuse 6 from the junction box which is in line with the security auto shut off. This does not seem to work. Another problem that just came about is sometimes while driving my rpms will go to zero then come back immediately.
What’s the best way to disconnect a car battery?
Clean any corrosion off of the battery and terminals with a can of spray-on battery cleaner. Disconnect the negative battery cable and then the positive cable with a combination wrench. Clean the battery posts and terminals with the post and terminal cleaning tool, so you have a good connection when you’re done.
What should I do if my battery won’t start?
You might try cleaning the battery connections along with the battery to chassis ground connection to see if that makes any difference. If the gauges are controlled by a BCM module then there may be a problem with it. By pulling the fuse for the memory power to the module that would reset it and possibly verify the trouble is with it.
When you disconnect your old battery from the car, you wipe out your car’s settings unless you keep the voltage in the car going. You want to keep a back current flowing to your car to retain its computer settings.
First, you want to find out if the immobilizer is the problem. To do this, turn on the battery in your Volkswagen and see if the immobilizer warning light is flashing on your dash, most likely in your speedometer. It should look like an outline of a car with a key inside it. If it’s flashing, it means the immobilizer’s disconnected from the system.
Hey, anything can happen. There’s a (miniscule) chance your replacement battery is toast. You can take it to an auto parts store and have them test it. Keep in mind that this problem is likely only if your car isn’t turning over at all. We hope this guide has helped you!
What happens to the PCM when the battery is disconnected?
The PCM is looking for the the “start/run” circuit to pulse which would be expected when the ignition key is turned on/off. But because of the switch fault this isn’t happening. When the battery is disconnected this provides the reset signal that the PATS system is looking for.