Toyota Tundra Horn Not Working? Let’s Work it Out!
It can be quite annoying when your horn stops working. Fortunately, it can be a simple fix. We’re going to run through the most common areas where it could have failed to give you the best chance to get it working again.
Check the Fuse
As with any failure with an electrical component the first step is to check the fuses. These can blow for minor reasons and are easy to check. Open the fuse box and find the one for your horn and pull it out. If it looks damaged then replace it with the same amperage one (10A). If the fuse is good then the problem lies elsewhere in the truck.
Listen for the Relay
This is a simple test that can rule out a lot of different problems. If you press the horn you should be able to hear the relay “click” into engagement. If you do hear it click then your relay is fine as is the majority of the wiring, the next step would be to check the horn itself and see if that has become damaged. If there is no click then it’s possible that the relay is bad or there is a problem with some of the wiring or spiral cable.
Check/Change the Relay
If the relay isn’t making any noise when the horn is pressed then this is the next place to look. This guide will give you a good idea of where to find the relays in your Tundra. Once you find it then there are a couple of ways of testing if it works or not. The easiest (in theory) is to sway the relay with another identical one in your truck. More often than not, the relay for the A/C is the same as the horn. Make sure that they have the same coding on the top before swapping, just in case they aren’t the same. Swap them around and test the horn. If it works, then they issue was with the relay and you can replace it easily.
If, however, you don’t feel comfortable swapping around the relays in your truck you can use a multimeter to check the horn relay. This video, at around the 1:00 mark shows the best way to do this.
Checking the Horn
Once you’ve checked the fuses and relays and found that they are fine the next step is to check the horn sounder itself. You can do this with your multimeter is you have one, and see if there is a current travelling across it when it’s pressed. If you don’t have a multimeter (buy one, they’re incredibly useful) then you can wire you a simple light. Attach this in parallel with the horn and see if it lights up, if it does then the problem is with with the horn itself and it can be replaced. If there’s no current then it’s most likely that there is a problem with the wiring from the relay to the horn.
Check the Spiral Cable
If your relay makes no noise when the horn is pressed then this can be the problem. Unfortunately this is a big job to get to and it involves removing the airbag. If this is something tat you’re not comfortable doing then it’s best to have a specialist do it for you. If you have experience in doing this and you feel confident then this video will give you a good guide on how to access it and replace the part.
Problems with the Wiring
Once you’ve covered all the bases listed above but still have a problem then it’s quite likely that there’s an issue with the wiring being damaged or shorting out. There is no real easy fix for this an the best way to deal with it is to have a specialist look at it. There is something you can do to help find where the problem is, if you attach your multimeter at various points along the horn circuit and see if there and area where the current stops it will give you a good idea on where the problem may lie.
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Filed Under: Maintenance Tips