2003 Chevy S-10 ZR2 4x4 4.3 L Vortec.
I REPLACED THE TCCM.
Question = THE FOUR WHEEL DRIVE DOES NOT WORK AT ALL. THE TRANSMISSION WAS
REBUILT IN THE SPRING AND WHEN I WENT TO ENGAGE THE 4WHEEL DRIVE THIS MONTH,
NOTHING WORKS. THE PUSH BUTTON SWITCHES FOR THE 4X4 ON THE DASH DOES NOT
LIGHT UP. WHEN HOOKED UP TO THE SNAP-ON MODIS SCANNER, IT SAYS THERE IS NO
COMMUNICATION WITH THE TRANSFER CASE.

IT DOES COMMUNICATE WITH EVERYTHING ELSE. I CHANGED THE TCCM AND NO LUCK. I
LOOKED AT A WIRING DIAGRAM AND THINK THE NUMBER 6 PIN SHOULD HAVE POWER, IT
DOES NOT. I DO NOT KNOW WHAT TO DO NOW? ANY HELP?
Answer:
A long as you are looking at the correct schematic- there are 2 different transfer cases, so 2
different modules- then yes, pin 6 should have power. First check the fuses. If all OK, you are
going to have to trace that wire. Then you will need to check for that circuit having continuity
through the relay block.

There could actually be an open circuit inside that. As a last resort, you could actually run your
temporary own wire to make sure this fixes your problem.


We had the starter replaced on our 2001 s10 and a day later the while driving the security light
came on and is staying on, could you please tell me what this could be.

Answer:
I really doubt is has anything to do with the starter replacement, probably just coincidence. When
the
security light comes on and stays on, there is a problem with the theft deterrent system on the
truck. Usually a problem the ignition cylinder/housing which contains the Passlock sensor.

We do not have a
chip key so would this still be the problem.

Yes. Your truck uses a Passlock sensor on the ignition housing itself, not the key. You would really
need to get any trouble codes retrieved from the computers on the truck to see exactly what the
problem is. But what usually goes bad is that Passlock sensor.
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Chevy S-10 4WD Problem- Theft / Security Light