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Dear Kyle123,
Good a.m. and may this find you well. On the 1994 Volvos, there are On Board Diagnostic (OBD) units. These are mounted under the bonnet, on the leading edge of the strut tower, on the passenger side of the engine bay (UK model). You should see two small rectangular boxes (about 40mm long).
The covers of these boxes lift off. On the side of one of boxes - that closest to the engine - you'll see the wire, that leads to a probe tip. Pull the probe tip gently from the holder, and insert it into the "A3" opening. Put the key in the ignition, and turn it to "ON" (the warning lights at the bottom of the instrument cluster will light-up). There's no need to start the car.
Go back under the bonnet. and Press the button on OBD Block A. Wait 1-2 seconds and release. The indicator light will blink. If it goes blink - blink - blink (= 1,1,1), then all is well. Because you know the ABS System is not working, the indicator light will give you a series of blinks. Write down the number of blinks in each of the three groups, e.g., blink / blink, blink / blink, blink, blink ( = 1,2,3 = left rear wheel sensor, circuit fault below 40 KmH).
Under FEATURES above, you will find the FAQs. Within the FAQs, you'll find the most common OBD Codes, and their meaning. Once you have these codes, you'll pretty much know what's amiss with the ABS System.
You should pull the codes for the other systems. You should also get the maintenance records. They may be in the car, or the dealer may have them. If the oil was not changed regularly, I'd avoid the car.
See if the timing belt was changed at the recommended interval (likely 100,000k miles / 160K Km).
Hope this helps.
Yours faithfully,
spook
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