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#1
12-06-2006, 10:47 PM
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No 4wd switch action or OBDII power
2002 silverado autotrac. 4wd inop, no status lights on switch or response from pushing the switch. Also, the OBDII port has no power. I traded a known good 4x switch with no change.
I checked a bunch of fuses, I'll double check the cig lighter fuse tommorow. Any other problems cause the 4x switch to be dead? 
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#2
12-11-2006, 01:32 PM
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Re: No 4wd switch action or OBDII power
You stated the OBDII has no power.. how did you determine that?
If indeed it has no power, which fuse box did you check? Did you check the fuse box under the hood? you will not be able to determine if some of the fuses are bad, unless you replace it. I think you may have a bigger problem if the all fuses are good
__________________
  2000 Silverado Z71, 5.3L, K&N GenII Air Intake, Y-pipe Exhaust (no muffler), Bosch Platnium +4 plugs, 242k miles and still running.
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#4
12-11-2006, 09:56 PM
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Re: No 4wd switch action or OBDII power
I determined no power because when I plug in a scanner nothing happens.
I checked the Cig Lighter fuse and found it blown. Replaced it, now the OBDII works but my scanner doesn't perform the super duper drivetrain stuff so it's no help. I still have nothing on the 4x switch, can anyone direct me to a wiring diagram or some pin voltages?
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