I have a 2002 Trailblazer LTZ with the airbag light and the phrase “Service Airbag System” scrolling across the dash in the info area. The Code reader shows only one code, and it’s B1000 which is ECU malfunction 2, according to my code reader. If you try and erase the code it says it is successful, but upon re-link it comes back. I already had myairbags.com reprogram the airbag module and get the same B1000 code. If I unplug any other sensors to the system then I get a code error for each of them. They disappear when the sensors are reconnected. I have no idea which component is causing the error. The Electronic Control module is communicating with the airbag module just fine. Is the Electronic Control module faulty? That is the module with three connectors located on the engine.
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2002 Chevrolet Trailblazer
Question: What component is faulty if I get a b1000 DTC and no other code?
Answer #1holston2008 September 22, 2012, 19:37Technician
i would say its safe to say the ecu is at fault, yes this module is located under the hood with three large connetors.
Replyslycaulfey, September 23, 2012, 09:10Rookie
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.
Replymooonshine199, January 09, 2013, 13:06Rookie
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.
Replyslycaulfey, January 10, 2013, 11:58Rookie
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.