Help. reversed battery connection to open the bonnet

[eijio]

Hi,

A battery in my Cayman 987.1 (2007) was dead, therefore, I tried to open a bonnet through battery connector in fuse box for replacing a battery.

I tried it several times with another battery or battery charger, but no luck.

And then, I misoperated. I connected it with reversed + and -.

After that, everything have not worked, such as door rump.

Does anyone know how to recover it?

I checked all fuses in the fuse box but all fuses are not disconnected.
Is there possible to broken the relay in the fuse box?

Thanks in advance,
Eiji

[JFP in PA]

Polarity reversals are known to burn up quite a few electronic modules in these cars, you now need to flatbed the car to someone that knows what they are doing..............

[jsutaguy]

I reversed the polarity on my 2006 Cayman S. Did you horn start honking and the window washers start spraying? I had to replace the main fuse, replace the fuse in my radio, and replace the alternator.

[stealthn]

JFP I assume you are serious, so which modules usually go? Do I need a PIWIS to go through every system? I accidentally touch the post putting in a new battery...

[JFP in PA]

Originally Posted by stealthn

JFP I assume you are serious, so which modules usually go? Do I need a PIWIS to go through every system? I accidentally touch the post putting in a new battery...

Depends upon the vehicle model and year, but we have seen everything from the alternator, Litronics headlight controls, PASM/PSM, PCM, to the comfort control system, the immobilizer, and even the DME cooked when this happens. A lot seems to depend upon what was switched on inside the car when the event occurs.

As a lot of these control modules need to be coded to the car, yes, a PIWIS is required, even if it is just to reset some of the systems. Sometimes most of the damage is blown fuses, but there is a lot of electronic stuff in modern cars that really does not like reversed polarity.

[stealthn]

Thanks!

It's a 2006 Cayman S, so a little less computers than today. I will check it today to see if the smell is gone (could be alternator) and check the charging. It did fire up right away, but I want to make sure nothing is damaged.

[stealthn]

Just changed the alternator; what a ***** of a job! Tight space.

On a positive note my Antigravity battery worked!, twice - battery was completely dead, press the button, and she fired right up.