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ABS problem on 1993 300ZX 2+2 - please read

My wife's 1993 300ZX 2+2 na developed a problem today that may be familiar to other 300 owners. The abs unit (in rear hatch area under a cover) makes a constant "pumping" noise at all times unless I disconnect the battery cable. Has anybody seen this before and what was the ultimate fix? The brakes seem to work ok but the constant "pumping" noise makes me concerned the unit will burn out. It just started today, and since I'm one of those "high-tech unemployed", I want to take a shot at it before Nissan puts me further in the poor house. I have the Nissan service manual, but the troubleshooting section doesn't mention a problem like this. I'm hoping its just a locked up relay, but anyone familiar with this problem may really know the correct answer already.

Thanks,

Bob Crueger. Dallas, Texas

Reply to
me too
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The relays do go bad but never seen one "lock" or weld the point together which is what would have to happen for it to "lock". If it's doing this with the key off, that seems very odd as I don't think it should even be powered up which the key off!

I'd be looking at the wiring schematic and trying to see why it is powered on with the key off. Just wondering, has anyone added any electronic gear, radio, alarm, phone ect lately?

Reply to
Steve

Steve - Thanks for the response. In looking at the schematic, it appears the Motor Relay is always hot , and is controlled by receiving a ground through either the Actuator Relay or the Control Unit. That explains why I have to remove battery cable to make it stop. It's also a good sign that it's probably not the control unit as that isn't energized with the ignition off. I do get a diagnostic code of (9) which is "Actuator motor, motor relay circuit". The whole assembly is kind of buried behind panels but I guess that's the next stept. I'm strongly thinking/hoping that it is just the "motor relay". Any idea the price of a "motor relay"?

Reply to
me too

I'd unplug the comtrol unit and see if it still runs.. Then you know it's something to do with the actuator relay portion. Process of elimination!

Reply to
Steve

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