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Electrical problem

Tiny
BYRNE493
  • MEMBER
  • 2003 HYUNDAI GENESIS COUPE
  • 50 MILES
Hyundai Coupe 1.6 petrol
Left lights on and battery went flat. Used jump leads and stupidly connected to wrong terminals, then tried to start. Realised the error and connected jump leads again, engine turned over but would not start. Bought new battery and installed, still wont start, wont even turn over, checked fuses and noticed main fuse blown(120 amp). Replaced fuse but still not starting. Have checked all fuses and relays, all look O.K. Was able to check relays in a friends coupe. Lights, wipers, electric windows all working. Horn, heater blower, radio not working and car not starting, nothing happens when I turn ignition except I hear a buzzing from area of fuel injectors, also fob will open the doors but wont close. Any suggestions would be much appreciated. Does the fact that horn and blower are not working suggest where the problem might be.
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Sunday, September 30th, 2012 AT 8:32 PM

11 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Re check the fuses with a test light. If they are all good, you may have fried the computer. There are several on board computers and one or all may be damaged. They dont like voltage surges.

Roy
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Sunday, September 30th, 2012 AT 8:44 PM
Tiny
BYRNE493
  • MEMBER
  • 6 POSTS
By several computers what exactly do you mean. Are they all built into the ecu? Is there any one that controls blower, horn and starter. Would I need to plug into diagnostic equipment to find the fault?
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Sunday, September 30th, 2012 AT 10:59 PM
Tiny
ASEMASTER6371
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You have main pcm, cluster, other modules as well. Yes, they control body functions. You may need help with this as a code reader will not help you get any info you need.

Did you verify fuses as I asked?

Roy
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Sunday, September 30th, 2012 AT 11:09 PM
Tiny
BYRNE493
  • MEMBER
  • 6 POSTS
Will check fuses again tomorrow and let you know. Thanks
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Sunday, September 30th, 2012 AT 11:17 PM
Tiny
ASEMASTER6371
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  • 52,797 POSTS
Ok
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Sunday, September 30th, 2012 AT 11:40 PM
Tiny
BYRNE493
  • MEMBER
  • 6 POSTS
Took your advice, found a blown fuse, that sorted heater blower and horn. I towed the car and it started, so looks like I haved a damaged starter, is there anything that could have blown in starter? Car radio not working and fob opens doors but will not lock them. Any more suggestions. Thanks for help.
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Monday, October 1st, 2012 AT 7:39 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Starter may be bad. Test the little wire for 12 volts in the start position with the key.

The fob may have to be re programmed.
The radio may be a victim of the voltage surge.

Roy
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Monday, October 1st, 2012 AT 11:54 PM
Tiny
BYRNE493
  • MEMBER
  • 6 POSTS
Thanks for reply. I will check starter at wk. End, looks to be in an akward position on Hyundai. I have tried reprograming fob, key to acc position in ignition and pressed on fob lock until indicators flashed, but made no difference. Perhaps there is a built in fuse in radio, Ill check this out later. Main problem now is starter, is there no fuse to protect the starter? Thanks again from Ireland.
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Tuesday, October 2nd, 2012 AT 7:51 AM
Tiny
ASEMASTER6371
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Re check all the fuses in the box. You may have to start at the ignition switch to verify power as I suggested

Roy
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Tuesday, October 2nd, 2012 AT 9:53 AM
Tiny
BYRNE493
  • MEMBER
  • 6 POSTS
Fuse at back of pioneer radio was blown, it is a 10amp similar to standard car fuse, so thats now sorted. For some strange reason the starter is now working but not all the time, checked wires going to solenoid, all seem o.K. I would need to run a few tests when it doesnt work but thats difficult to organise. I think I will have to buy another starter as I cant trust this one? No joy with fob, opens the doors but wont lock, also wont centrally lock with key, have to lock the doors individually. Thanks for earlier suggestions.
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Saturday, October 6th, 2012 AT 8:39 PM
Tiny
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Good luck

Roy
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Sunday, October 7th, 2012 AT 2:18 PM

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