Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Was the TCCM programmed after it was installed or did it come pre programmed ready to install?
Have you tried to disconnect the transfer case actuator to see if the lights then come back on?
Let me know so we can continue,thanks Pete.
O.k.,check this 8 volt wire for a short or resistance to ground or power with the switch and the TCCM unplugged.If there is resistance to ground or resistance to voltage this indicates this wire is shorted and needs traced to locate and repair the source of the short.
If this wire checks out o.k. unplug the encoder motor at the transfer case,pull the 4wd fuse for about 5 minutes then reinstall it and see if it lights up then or if you then get a service 4wd fault.I have seen the encoder motor short out and damage the TCCM or cause the TCCM to act up.Let me know if you come up with anything here.
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The only thing I can think of here is that the TCCM that was installed either does need programmed or is programming incorrectly for your model here or was faulty out of the package needing replaced again.If you can I would see if the facility you receives the TCCM from will parts warranty it for you at no cost to you and see if this resolves the issue here.With the correct power and grounds at the TCCM and no wiring faults the switch should light up.