2002 Saturn SL1 lock horn cherp doesnt work

Look for a second horn relay. I appreciate the fact you provided a lot of good information. The fact that it's trying to work rules out a programming issue. The chirp can be programmed off and sometimes it will self-program to not chirp when the battery is disconnected or run dead, but since it's trying and just sounds sick, the horns are not getting enough voltage. The main relay is working because the horn sounds normal, so there has to be another switching circuit. If you can't find a second relay, it could be inside the Body Computer or the Remote Keyless Entry Computer. I'm sorry (happy) to say I don't know much about Saturns either, so I can't tell you where those computers live. You could disconnect the horns, then use the key fob to activate the locks while you listen inside for the click of a relay. That might give up its hiding spot.

Caradiodoc

Oops, my mistake. So if I understand correctly, the horn sounds normal when you press the button on the steering wheel, but it squawks when you press the lock button on the remote. Can I assume the panic function, which you said works, is some type of siren and not the regular horn? If the panic function is the horn, and that is working, that would certainly add some confusion.

I'm really surprised swapping relays didn't help. You have to use up the full 12 volts in the circuit, and ideally that is supposed to be done by the horn. If some of that voltage is used up in pitted relay contacts, the horns won't get enough voltage and they'll go, ... Uhm, ... "Ugg"! Since the relay is obviously turning on, we can rule out the Body Computer or Remote Keyless Entry module. Yippee. Those are expensive.

Find a cheap digital voltmeter, and measure the voltage getting to the horns. You should find near 12 volts when pressing the horn button. The meter won't respond fast enough to the short chirp from the remote lock function, so since you already have the luxury of knowing which relay it is, either pop the cover off and reinstall it so you can squeeze the contact by hand, or use a jumper wire to bypass the contacts. I prefer removing the cover because you don't have to figure out which terminal is which. I suspect you will find the same sick sound when you squeeze the contacts, and there will be less than 12 volts at the horns. If that's the case, we will have to figure out where part of that 12 volts is being used up.

By the way, to be sure you're looking at the right relay, try the horn button, panic button, and remote lock button when the relay is removed. The remote lock chirp should be missing, but the regular horn should still work.

Caradiodoc

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