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94 860 odometer kaput... Fixable?

The good news: Tire shop gave me a free rebalance because I had driven only 150 miles in the last 3 months.

The bad news: My odometer quit working 150 miles after I had the wheels balanced the first time..

Went to run the Function Test (A7, press button 3 times), but I found the wire already plugged into A7. I must have forgotten to unplug it when I changed the oil. I figured that this might be the cause and unplugged it.

Next day, odo still NG. Tonight: Ran the Function Test.. All the needles point where they're supposed to, but the odometer doesn't even twitch. (Speedometer works, so it's getting the the speed input signal.

Leaving A7 plugged in shouldn't have done it, since it just goes directly to an IO pin on the combined instrument microprocessor.

I'm hoping it's just a cracked solder joint. Has anyone disassembled the combined instrument enough to see how the odometer motor / solenoid is wired up? Is it driven directly by the main board, or by electronics within the speedo assembly itself?

Now to find out how to remove the thing from the dash.

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Reply to
Doug Warner
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There's a gear that cracks, so it doesn't grip the shaft that the odometer digits are on tightly enough to turn it. I had this problem on my '76 240, and "damaged" the shaft with vice-grips to enable the gear to grip the shaft. Or head on over to

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andbuy yourself a new one.

Reply to
Mike F

I just took it apart with the help of:

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difficult to remove the cluster out the way it's shown here.It looks like I'll have to remove the passenger airbag moduleto freethe right end of the dash cover so I can reinstall the cluster withoutforcing it.

Mine has a missing tooth:

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is the one that's turned by the gear on the motor shaft. I'mguessing it's the 15 tooth one odometergears.com is selling for$25.00, since I can't see any other 15 tooth gears in the unit.http://www.odometergears.com/subpages/volvo.html

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Reply to
Doug Warner

His car is a '94 though, the speedo's (and odometers) went electronic in '86 on the 240's and earlier than that on other models.

Reply to
James Sweet

Yes, but as you can see from his second reply, electronic 850 speedos have problems with the gears, just as 240s with mechanical speedos do.

Reply to
Mike F

Yep.. And, if anyone wants to see some photos:

First, after a big struggle getting the cluster out while bending the right half of the dash up, I removed the glovebox, a few more screws, the right speaker, and the airbag calbe and bolts. then lifted the whole dash out. A 2.2 ohm resistor in the airbag connector keeps the controller from posting an ignitor fault:

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Back of the cluster. To get the front window section off, remove the screws indicated, as well as the nut around the boost gauge stem.
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Front view. The dial plate is clear acrylic, about 1/4" thick, Just pry it offm working around the edge. It unplugs from the board in back
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Open view: The pins on the instrument actuators plug into the board. Reassembly involves pusing the panel back on, taking care to avoid fingerprints on the flat black surface.
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The odometer is, located by a couple of pins in holes. A 2-wire connector links it's motor to the board. Just lift out and unplug.

I removed the motor from the odometer's right side and found this:

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The 15-tooth one from Odometergears.com is the replacement. On order.

And, while I'm posting photos.. if you like macadamia nuts, don't buy this:

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's what I found in the can.)

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Reply to
Doug Warner

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