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Discussion Starter #1 (Edited)
Hello all,

I had a good running 2004 new beetle GLS hatchback 2.0 non-turbo and it had been sitting a while as my backup car. I went to jump it the other day because the battery was low, and I made the mistake of putting the jumper cables on the wrong posts, backwards, while the other car was running. It was dark...dumb mistake on my part.

It made a spark when connecting the cables to the terminals and the windshield wipers and cooling fans started going bonkers.

I immediately reversed the cables after I noticed they were on backwards after about 30 seconds.

After I noticed the flat metal fuse on the left was burned in the fuse box on top of the battery, so I went and got a replacement and changed it out. Now no fuses on the top of the battery are burned. the other three fuses are ok too.

I also checked some of the fuses on the side of the dash that had the engine symbol and all of them were ok too.

Now everything in the car works, lights, alarm, keyless entry, dash lights, horn, etc...except when I turn the key nothing happens, the lights come on, but the engine is not cranking over.


I tried to do a search for some videos of what to check. I found one but it was for a Jetta that tested the starter relay and ignition switch, but it seems a little different and I can't make heads or tails out of the relays under the dash because I can't find any reference chart that shows what each one is or what the process is for testing them, or which ones to test. To make it more confusing they talked about bypassing the alarm too.

I took a couple pictures of them so you can see what they look like.

I know nothing about electrical.

Please help! Thanks
 

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Hmm, this could be tough; to know, what damage occurred, when you hooked up reverse polarity on the battery. Checking for melted components, bad wring, melted ignition switch and relays, could all be possible issues.

Here is the relay panels; look on the left for specific info, on relays you want to research:

https://workshop-manuals.com/volkswagen/new_beetle/l4-2.0l_(bev)/relays_and_modules/relays_and_modules_accessories_and_optional_equipment/alarm_horn_relay/component_information/locations/

https://workshop-manuals.com/volkswagen/new_beetle/l4-2.0l_(bev)/starting_and_charging/relays_and_modules_starting_and_charging/clutch_switch_relay/component_information/locations/

https://workshop-manuals.com/volkswagen/new_beetle/l4-2.0l_(bev)/starting_and_charging/relays_and_modules_starting_and_charging/starter_relay/component_information/locations/

Checking for power at the starter; would be a easy thing to check and the possibility, of a fried ignition switch, should not be ignored.

https://www.newbeetle.org/forums/technical-how/59181-ignition-switch-replacement-diy.html

While, this is geared towards the tdi engine; the principles, of testing things is similar and could get the ball rolling, to start testing power at the starter:

https://www.myturbodiesel.com/wiki/starter-removal-and-testing-mk3-and-mk4-tdi-engines/

If the immobilizer is kicking on and blinking; it might be a issue with the anti theft system:

https://www.myturbodiesel.com/wiki/immobilizer-faq-and-troubleshooting-for-vw-and-audi-with-key-replacement-tips/

While, I do not know; what your current problem is, the above info, should get you started on testing and researching things. Hopefully, all this info; is not too much, just start simple and start checking the basics (power, starter, ignition switch, etc). Let us know, what you figure out and we can go from there. Thanks.
 

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Discussion Starter #3
help

I have an 2004 vw new beetle gls 2.0 and it was running fine...then I accidentally put the jumper cables on the wrong terminals when jump starting it as it had been sitting a while...and now it won't start. one fuse blew on the left side of the fuse box on top of the battery and the stereo fuse on the left side of the dash. I replaced both of them and everything on the car works, except when turned to the start position nothing happens, no cranking, no clicking at the starter. I swapped out the 2 relays under the dash 53 and 175 and still same problem. i took apart the steering column to get to the ignition switch, looks normal. I took a test light and pulled the wire off the starter and had someone turn the key to start and the test light did not light up, it was grounded on the battery. So, i'm not sure what else to check. could you help or maybe even do a video on it?

Thanks.
 

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Well, ultimately, you are going to have to checking things and do some troubleshooting. If you are not getting power to the starter; when you are using the key in the ignition and trying to start, then it would make sense, to check the ignition switch. This thread, shows; how to get to the switch and the typical problems to look for (plug, wires, contacts melted or damaged/melted switch itself).

https://www.newbeetle.org/forums/technical-how/59181-ignition-switch-replacement-diy.html

We can suggest and give you ideas; on what to check, test and troubleshoot but you will need to do the hard work yourself, figure things out or take it to a pro shop, have them fix it for you.
 

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Discussion Starter #7
Help again !!!!

It was running fine then now check engine light came on and still drives ok except it doesn’t want to shift up at higher speeds it just stays in same gear.

I got a few check engine codes
P0743 torque converter circuit electrical
P0748 pressure cntrl sol A ckt electrical
P0753 shift sol A ckt electrical
P0758 shift sol B ckt electrical
P0785 shift/timing all malfunction

I remembered having to change two blown fuses on the dash side which allowed my car to start again

Any suggestions???

Help!!!
 

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Always look up trouble codes; in the ross tech wiki but sometimes, they are not listed there but scanning with a vw scan tool, would give you vw factory trouble codes which may give you better info: (all these codes; seem to be auto transmission related):

P0743 https://www.autocodes.com/p0743_volkswagen.html

P0748 https://www.engine-codes.com/p0748_volkswagen.html

P0734 17118/P0734/001844 - Ross-Tech Wiki

P0753 https://www.engine-codes.com/p0753_volkswagen.html

P0758 https://www.engine-codes.com/p0758_volkswagen.html

p0785 https://www.engine-codes.com/p0785_volkswagen.html

Which tranmission do you have; the 01M 4 speed or the 09G six speed? We typically see, wiring problems, shifter selector assembly failure, failed sensors and sticking valve body solenoids, causing shifting problems. This won't fix anything but you might try a hard reset; see, if clearing the tranmission settings, helps anything. Remove the positive/negatives battery terminals; touch them together, for a couple of seconds and reinstall on the battery. Further investigation and testing maybe needed to narrow down the problem; a VW scan tool, like VCDS by Ross Tech, can help see live data, from the tranmission and view, which parts, maybe malfunctioning or not working as they should.
 

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Discussion Starter #9
Does it seem to you that getting all these codes seems like one common issue, such as maybe the connection to the computer or something like that?
Do you know where the harness is for all these connectors? So I can check them?
Where would u start checking and do u have a diagram or pictures.
I never had any problems with transmission before. It still drives fine just won’t shift into high gear.
Thanks for the help
 

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