GO STEELERS !!!
Join Date: Sep 2003
Location: Troy, Ohio
LabRat116 is offline
99 Blazer 4x4 Not Working...
I just bought a 99 Blazer the other day. I knew it had an issue with the 4x4 before I bought it.
The lights on the 4x4 buttons will light up (for the quick diagnostic test) and then go out (and remain out) completely. I can NOT activate the 4x4 functions at all using the 4x4 buttons.
The Service 4WD light illuminates after driving about (5) miles or so.
I took it to a local reputable tranny mechanic who then pulled the codes. He got a Code B2725 which mentioned something about a Switch.
The mechanic was able to manipulate the transfer case into and out of 4x4 via the Code Scanner (pretty cool I thought!). So I know that the 4x4 components (actuator, encoder, motor and TCCM) are all working.
He said it most likely is a bad 4x4 Switch. He did mention that his scanner "should" have only been able to manipulate the Auto-Track (NP8) transfer case and not the NP1 transfer case. (Not certain his reasoning though....).
He was questioning whether or not someone "may" have installed the wrong switch. ???? Maybe installed this (3) button switch instead of the (4) button switch.
Now, he crawled under the truck and verified that it does in fact have an NP236 (NP1) transfer case underneath it.
However, the Codes in the glove box do NOT show NP1. There only is an NP8 showing.
He mentioned it would be a significant under taking to change from a NP8 back down to an NP1. Different case sizes as well as different driveshaft lengths etc... So, that would NOT be likely a person changed from stock. ??
I'm thinking about just buying a new (3) button switch and see what happens ??