I replaced the switch, did not work, all fuses are good, I notice the lights flash on anitial start up of the vehicle, no codes came up on the scanner, what do you recommend?
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2000 Chevrolet Silverado 1500 Question: I have a 2000 chevy silverado 4x4, no lights on the selsctor switch?
pushrod December 07, 2013, 08:35Master
Is the 4x4 working? Was it scanned with a pro. quality scanner? Not a code reader!
Replycraigars, December 07, 2013, 12:32Rookie
no , the 4x4 is not working and it was scanned using 3 different code readers purchased from auto parts stores, which I assumed would let you know the problem area.OH, and yes it is the 4 button selector switch.
Replypushrod, December 07, 2013, 12:40Master
Code readers cant 'scan' the transfer case module or read it's codes! Suggest having it tested with a scan tool.
Replycraigars, December 07, 2013, 12:53Rookie
Thanks, guess I will have to take it in and have a quality scanner check it out. I appreciate your response and your time.
Replypushrod, December 07, 2013, 13:03Master
Answer #2bad007 December 07, 2013, 10:53Enthusiast
NP8 or NR4 RPO code on the glover box label? 3 or 4 button switch assy. The controller is responsible for illuminating the switch indicating the mode your in. As asked B4 does the 4x4 work or not and was it scanned with a real diagnostic monitor, not just an OBII scan tool. The transfer case shift motor is real common with those as well as the transfer case control module.
Replycraigars, December 07, 2013, 12:43Rookie
It is the 4 button assy and it was scanned using the OB scan tool, the 4x4 does not work at all.
Replybad007, December 07, 2013, 12:52Enthusiast
Pushrod is right, Those code readers are what we call generic OBII code readers and are for the engine codes only. It wont scan other systems like body controllers , transfer case control modules, auto climate control modules and manufacturer fault codes over PO1000. It needs to be scanned be a pro grade scan tool.
4 button should be the NP8 system and is the more expensive one. There should be a label inside the glove box with one of those codes. The NP8 will have a connector going into the shift motor plus a short wiring harness that breaks out of it with a rectangular plug on the end.
Replycraigars, December 07, 2013, 12:58Rookie
Will have it scanned professionally , greatly appreciate you people being out there for the guidence.
Replybad007, December 07, 2013, 12:59Enthusiast
Your welcome :D