abs and brake light on

We need to get the code it sounds like you have a hub bearing in the front that is out. These videos will help

https://youtu.be/Pb6nXV-iamI

and

https://youtu.be/ZgiPRG6jffc


try following this bulletin.Subject: ABS Red Brake SVC and 4WD Light On HVAC Blower Inoperative


Models: 2004-2007 Buick Rainier

2002-2008 Chevrolet Trailblazer models

2002-2008 GMC Envoy models

2002-2004 Oldsmobile Bravada
Diagnose for loss of battery voltage to the rear fuse block on circuit 300 ORN for the following fuses:

Note: Prior to proceeding forward with the information below, it is important to verify the voltage as indicated however it is equally important to verify the integrity of each circuit. This can be achieved by performing a voltage drop test or by adding a device to each circuit that will supply sufficient load to verify the circuits integrity.

HVAC 30A, 4WD 15A, HVAC 1 10A, BRAKE 10A, TBC RUN 3A.

Check circuit 300 ORN for battery voltage when the ignition key is in the RUN position.
Check for battery voltage at the rear fuse block under the rear seat Connector C1 pin D9.
If battery voltage IS NOT present at these locations, check for voltage at the ignition switch pin G for circuit 300 ORN.
If battery voltage IS present at the ignition switch pin G, check circuit 300 for an open.
If battery voltage IS NOT present at the ignition switch pin G, replace the ignition switch. please post back with the findings.

[quote:dbcb065406="brian 1"]try following this bulletin.Subject: ABS Red Brake SVC and 4WD Light On HVAC Blower Inoperative

Diagnose for loss of battery voltage to the rear fuse block on circuit 300 ORN for the following fuses:

Check circuit 300 ORN for battery voltage when the ignition key is in the RUN position.
Check for battery voltage at the rear fuse block under the rear seat Connector C1 pin D9.
If battery voltage IS NOT present at these locations, check for voltage at the ignition switch pin G for circuit 300 ORN.
If battery voltage IS present at the ignition switch pin G, check circuit 300 for an open.
If battery voltage IS NOT present at the ignition switch pin G, replace the ignition switch. please post back with the findings.[/quote:dbcb065406]

Thank you for the response, however, it looks like I would need to get a manual or schematic of the Trailblazer in order to troubleshoot the issue.
I also read in a blog entry that someone mentioned that it might need to be taken to the dealer to have the computer "sync'd" up with the controls. Do you know anything about that?

I've never heard of it being sync'd up,I don't even know what that is?you should not have to do anything with the computer.this is a pretty straight forward problem with a staight forward fix.post back with what you find.

Brian 1,

The problem was resolved via checking the voltage on pin G on the ignition switch -no voltage present. Replaced the ignition switch per TSB, system running well. Set of contacts on old switch had noticable heat marks on them.

Thanks again for your help.