1993 OBS Speedometer and Cruise Control wiring

[LS1GMCTruck]

Would a '96 have a DRAC and a VSSB? Or by '96, were they built into the engine computer itself?

[92 6.0]

I was wondering if anyone has the wiring diagrams for the cruise circuit. I hooked mine up just as the instructions stated but it still don't work.

[RedHeartbeat]

First thing to check is the power and ground leads at the control box. Send me your email address address and I'll fwd you the diagram.

Check the funtionality of the cruise switch while you have the cruise box unplugged. Put a multimeter on the leads and look for 12v when you press the control buttons on the steering column.

Your speedometer is working, correct? You did disconnect the wires in the top from the DRAC module and didn't just splice into them, right?

[92 6.0]

Yes my speedo is working. I cut the wires and spliced them in to the vss output of the ecm. My cruise never worked before the swap but I thought it might have been the faulty brake switch I found when I was wiring up the tcc wire.

[RedHeartbeat]

yeah, bad switches, wiring or module itself. My cruise module has over 200k and my 92 had over 300k on it without missing a hitch.

[92 6.0]

Ok I have verified the switch is working. Its getting a signal from the vss. My question is I cant seem to find which wire is suppose to be ground for the cruise module. Every wire seems to have voltage at one point or another. The only one I think could be the ground is a black with white stripe. Never mind found a pretty good diagram in pdf I have if anyone needs it.

[RedHeartbeat]

black and white wire is ground. You can try taking the cover off the cruise unit and see if you have corrosion on any of the contacts but it sounds like your box may be dead. Salvage yard units are cheap replacements but be sure you get a warranty that its not a dead unit.

Store the pdf file up on photobucket or here for future reference if you would.