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TrailBlazer 2002-2009
The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
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Many warning lights

Old January 12th, 2019, 12:05 AM
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Default Many warning lights

I have a 2004 trailblazer with 23,000 original miles.
Ive been getting a PO455 code for awhile now and the other day when I started it the ABS, BRAKE, SERVICE 4WD lights all stayed on and a warning chime chimed for a minute or so. I also noticed the heater wonít work and when you turn the engine off and open the door the radio doesnít turn off and the door lock delay chime and delay locking also wonít work. But the doors do lock, just with no delay.
The PO455 code isnít related to the other warning lights Iím sure. But I have installed a new AC gas cap, AC ignition switch and two AC evap solenoid valves.
One on the engine and one back by the gas tank. This is my wifeís car and she wonít drive it anymore until itís fixed. So I would really appreciate any help to figure this out.
PS, the ign sw, gas cap and evap valves were changed several years ago. Thanks, Karl
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Old January 12th, 2019, 11:49 AM
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The abs may be related to a ground wire. I am not sure if your model is affected, but there is a service bulletin covering that issue, and I cannot find it. Google GM abs issue, you might get more help with it. The other stuff, door locks, radio ect. could be related to a ground also, however all those things have the body control module in common. The service 4wd, could be about anything. Have you tried to shift in, and out of 4wd? If it's the push button, is the led light on? Those have a history of switch issues. If it isn't shifting, could be the shift solenoid, that is part of the shift motor.
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Old January 12th, 2019, 11:36 PM
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Default Grounds are good

Thanks for your suggestions. Iím pretty sure all the problems are related to one cause. Iíve gone over every ground on this car. I even removed any paint found at ground points.
I have found that all these issues happen at the same time. The 4WD wonít transfer from RWD also. This car has a switch that you turn to select 4WD.
On the rare occasion that the lights donít stay on, all the problems I described work perfect. All of them!
Then the next time the lights stay on and they all act up again.
Iíve decided to replace the ignition switch again. They seem to be one of the most common fixís. Then Iíll try the BCM. If none of that works then Iíll do what my wife suggested! Trade it in on a new car...
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