Q&A

This all happened when I left the key on and drained the battery dead. After charging the battery I got a check engine light, the air bag service light and the 4x4 lights stopped working and no 4wd. The only code is b1000 ecu malfunction 1. Here is what I had to do. First pull maf or map sensor and get it to throw a engine code then cleared all codes. This took out the check engine light. Replaced the transfer case control module, this restored 4wd operation. Sent airbag into myairbags.com. They sent it back and said it was as good as new. Unfortunately it did not work. Had to buy a new airbag module and have it programmed.

Have you fixed this yet? I have the exact same problem. Service Airbag, B1000, 4x4 lights out. Changed ECU (left side engine- three large plugs...that did not fix anything- wasted 100$ for the reprogrammed unit). Next swapping out the TCCM as I read they go on this year (02TB) and also replacing the SRS module under the center console. Will update when I get the parts in a few days.

Yes, it is the transfer case control module located under dash on left side of car under dash, can barely be seen from side inspection panel behind drivers door for the 4x4 not working. The air bag module was also burned out, even though myairbags.com said they reprogrammed it and it was good as new, they lied. It is located under center console at rear just under carpet so you can't see it. If you buy used modules for any trailblazer up to 2006 they will work and not need any programming from the dealer.