Odometer cluster not working + constant horn output on 300m?

[Milamber]

Just last night my 2001 300m started going bonkers - the horn is constantly engaged and the odometer cluster isn’t functioning. I pulled the fuse to the horn and while the car still starts, and all other functions seem to work, the odometer still isn’t working and if I put the horn fuse back in, it still is constantly engaged.

Anyone have any suggestions as to what to look for?

 

[Bruce Yelen]

Have you checked the horn relay?

 

[tim bur]

you need to have the faultr codes pulled form the computers in the car first thing

 

[Bill (2)]

There may be a driver IC leaky or shorted on the output from the body control module (horn relay output circuit). Also check for power sources to the BCM, and J1850 bus communication problems.

 

[tim bur]

if you have the fault codes pulled you can assume a lot less in whats causing the issue have you had a windshild replaced lately???