How To: Remove 105Kmp/h Speedo Chime + Speedo Sticking (Properly)

[Nic_A31]

Hey guys, Has been asked several times on this forum, how to remove the beep the Cefiro's put on at 105kmp/h.

I do believe that simply unplugging the modules below the steering column (above your knee's) will also remove the warning beeps for leaving your lights turned on, or if you're about to lock your keys in the car. The following method will retain those warnings.

Some A31s also have a problem with the speedo sticking at around the same speed when accelerating.

The needle will either stick and hold on that speed until you decelerate, or stick temporarily then continue climbing (lagged behind your actual speed).

These 2 problems are linked.

I had to remove my interior today to do a couple of things, and this was on the list.

Very easy.

10 minutes max.

Remove all trims in the way to access the speedo cluster.

Remove cluster itself.

Remove clear cover from cluster.

Remove bezel (black surrounds) from the cluster.

Remove the speedo gauge (2 screws on the back of the cluster, push the gauge out the front of the cluster)

I compared the speedo I had to the one out of my late model C33 halfcut. It's possible early model Laurels have this 'feature', and/or it's possible that late model A31's don't.

If your speedo has this red wire, then you've got the beeper bug.

You'll see along the shaft from the speedo drive, there's 2 lips on the ring.

One has a slightly smaller diameter to the other. As the speedo is moving faster than 105kmp/h (depending on speedo sync) the larger of the 2 lips on that ring will make contact with a plate (feeler) linked to the red wire. The reason some speedo needles stick at the same speed is because of the same lip. The entire drive will get stuck on the sensor and fail to keep climbing (this may only be related to speedo's with a cracked plastic housing where the speedo cable join the gauge).

The red wire goes to a 3 pin plug, along with the black and white wires. This tells your ECU your speed, so don't just chop the whole plug.

I removed the red wire entirely, along with the metal contact plate (just keep bending it back and forth until it snaps off)

My late model C33 speedo didn't have the red wire at all, any metal contact plates or even a lip on the ring. Absolutely no provisions at all for a speed warning.

This is the Laurel speedo:

This is the Cefiro speedo after removing the speed warning.

If you're wondering why I didn't throw in the C33 speedo, it's because the drive inside it was already stuffed, and it's a different face compared to the early models.

[Miguelone]

Nice write up. I believe later model Nissans had the warning buzzer as an optional feature that includes a module and loom that plugs in somewhere. I know the R33's at least had this so it stands to reason that other models should have as well.