Have Honda Questions? Ask a Honda Repair Expert.
Is this a factory alarm or an aftermarket alarm?
To get the horn to stop honking on a factory alarm try turning the key to the on position for 3 seconds and then back off 3 seconds 4 times.
Then we'll see if we can figure out why it's going off.
The alarm was probably going off because the battery was low. I attempted the phone call but there was some kind of error. If you prefer we could communicate here. That's ok by me- the phone call request is automated.
Can you check to see if the headlights and radio come on?
Is it the factory alarm or aftermarket?
This system is designed to make the horn go off whenever a low battery is detected- it sounds the horn in case someone is trying to remove the battery in an attempt to steal the car.
If the battery is getting low sometimes it will sound the horn for no reason at all.
When you try to start it does it just click or does it do nothing at all?
Try resetting the security system by turning the key in the ignition as I mentioned and see if anything changes in the way it goes off.
When it's dinging like the key is in the ignition, the key is in the ignition right?
Ok. I need to run through the schematic for the factory alarm on this car. What is the model?
It looks like the element doesn't have a hood switch or anything that would normally keep it from starting.
It still seems like a low battery condition might be causing it to act up.
Do you have a multimeter to do some testing so we can see if the starter is ok?
It might need to be reset by turning the key on and off again, but it shouldn't cause any other issues.
I would need to see readings for a multi-meter to be sure. The alarm system on this car isn't very sophisticated so it shouldn't be preventing the car from starting.
Without being able to do any testing, yes. Sorry, don't mean to be non-committal here but, yes.
Please let me know if you need additional info.
Here is how they test the starter if needed:
There might be a factory remote start (not very common on this car) that has a hood switch that is keeping it from starting. You will need to look around the edge of the hood for a small contact switch.
This is what it looks like on the honda odyssey:
No, that's the AC switch. It should be somewhere on the edge of the hood that contacts the hood when it is closed.
When they checked the starter did they check to see if the starter was getting a trigger signal on the S connector in the diagram?
Did he just have a battery tester?
He wouldn't be able to test the starter with just a plug in tester. He would need to check for 12 volts with the key in the crank position at the terminal I sent the picture of.
Did he do anything at the starter test connector?
If we aren't getting 12 volts at the test connector then we need to go backwards from there and see what is cutting volts to the starter trigger circuit.
If he is getting 12 volts to the test connector then the starter should crank, unless it's out.
If he did not see 12 volts at the starter trigger wire in the connector, how did he test the starter? Did he jump 12 volts to the starter to see if it would crank?
According to the factory starting diagram the alarm can't keep the vehicle from cranking.
Do you have another key you could try?
Is the green light flashing vehicle cranking?
I'm sorry, while trying to crank.
Something in the starting system is malfunctioning. You'll need a multimeter to test to see what the problem is. You could remove the starter cut relay and replace it, but again, without a meter you won't know if that the problem for sure.