2002 Hyundai Sante Fe Everything shits off on startup

Asked by Oct 25, 2019 at 03:21 PM about the 2002 Hyundai Santa Fe

Question type: Maintenance & Repair

When I insert the key and put it to the on position
everything comes on, radio lights fans etc. but
once I turn the key to start everything shuts off and
won't come back on again for several minutes.  At
first I thought it was the relay because when I took
the relay out the car wouldn't crank but all the
lights and radio stayed on. Replaced the relay but
still have the same problem. I'm guessing it's a
security system issue probably with the ecu but
om trying to find out if it could be something else,
a short perhaps? If anyone has any idea I'm all ears
thanks.

2 Answers

18,995

Start by checking the battery cables for corrosion and make sure they're tight

76,815

Yes, it could be loose or corroded cable connections and most likely on the ground side. But it could be just a bad battery. When you try to start, the lights go out because the battery is so low, the starter motor takes all the current and robs the lights. You said that after this, the lights remain off for a while. That is more indicative of a battery problem than a cable problem. Make sure the cable connections are clean & tight, and have the battery tested.

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