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

Question

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 · Accepted Answer

Have you checked the horn relay?> Visit Topic URL to contact author (reg. req'd).  Report abuse: >

tim bur · Answer

you need to have the faultr codes pulled form the computers in the car firstthingBruce Yelen wrote:> > Visit Topic URL to contact author (reg. req'd).  Report abuse:> >

Bill · Answer

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.

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> > Visit Topic URL to contact author (reg. req'd). Report abuse:>> >

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tim bur · Answer

if you have the fault codes pulled you can assume a lot less in whats causingthe issuehave you had a windshild replaced lately???Bill wrote:> >> > Visit Topic URL to contact author (reg. req'd).  Report abuse:> >> > > >

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

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