I have a 1994 Jeep Grand Cherokee with 149k miles. When I get close to hitting 150,000 mile, the mileage meter starts going backwards until it hits approx. 148,000 miles, and then goes forward again to repeat the cycle. Why does it do this? When I go for inspections the mechanics think that I am turning back my mileage meter.

In the overhead display click through until you get to where it shows the service mileage readout then hold your reset button until it beeps and you'll see it reset.

Hi there:
Hit "Select" until it shows the mileage then hold "Set" till it resets.
Check HERE the procedure.

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Vibration from about 40-60 mph is usually attributed to wheel balancing, but the onset when you hit a bump seems to indicate play in the steering linkages (tie rods etc) or suspension members and stabiliser bar rubbers but you had that all checked out, that brings us back to the wheel balancing.

hit step until it shows miles to service then push reset then hit c/t to get comp, temp back

this is a service reminder and can be reset by you, it refers to regular maintenance intervals the are recommended by the manufacturer that can be found in the owner's manual such as oil changes, air filter replacement, tune-ups etc., depending on the mileage of the vehicle. to reset, try this procedure. hit step button until console reads 0 miles to service. than hold down the reset button until display resets miles.

there are two buttons on the diagram panel screen, push and hold top button and a one of the entries will start to blink, then you use the bottom button to change the entry, when you are ready to move to the next entry push the top button again.

Check wheel balance,
check steering linkages for loosness - such as tie rod ends, steering rack linkages etc,
check driveline for worn/loose joints and bearings.

It means the mileage has elapsed for service time. It may be set to 5000 mi or other lower settings. Using the <step> button, step thru the items until it says service and the miles between services will display. You can hit <reset> at this time to reset the miles but I don't recommend this until you have performed the required service determined by the total mileage of your jeep. The user manual has a chart for this. It you reset it now, the bonging will stop and you may forget to do the service your jeep is crying out for.
Rudy

yea you have to keep hitting menu until you see the service reminder pop up then you can select if you want it on or off its all in you owners manual