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Hummer H3For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.
First the key got stuck even though it would start fine and the battery stayed charged. I kept taking the battery off every time I parked until I could figure it out.
I finally tore apart and exposed the switch behind the key. I disconnected it and the key came out so I ordered a new one. I put the new one back in and the key still gets stuck. Then I started throwing B1390 Codes. I tested fuses 7 and 32 and they’re both live. I downloaded the repair manual for it but I’ve yet to figure it out. Voltage signal is zero and should be 12.6 to 15 volts.
My immediate problem is my manual doesn’t give reference or graphic to terminal H terminal F terminal A or terminal C. I’m wondering if I should just go ahead and replace the GBCM.?
It starts and runs fine but I’d like to fix it and put it back together :-)
DTC1390 the GBCM Generator battery control module
