It's in the steering column - Note that there's a service bulletin on the ignition switch for the 03 Trailblazer
On this vehicle, the ignition switch has three power circuits that feed different parts of the vehicle. if part of the switch goes open, it will cause several power losses to various electrical system.
#PIT3432A: Intermittent Dead Battery - keywords draw indicator light performance PRNDL - (Mar 5, 2007)
||Intermittent Dead Battery|
||2002-2007 Buick Rainier|
|2004-2007 Chevrolet Trailblazer and Trailblazer EXT|
|2002-2007 GMC Envoy, Envoy XL and Envoy XUV) |
|2002-2004 Oldsmobile Bravada|
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Intermittent Dead Battery. Inspect the ignition 0 circuit for voltage when the key is removed from the ignition
This can be identified by watching the PRNDL display and the battery light on the IPC. Using the tip of key in the ignition cylinder, manipulate the ignition switch by rotating forward and rearward to see if the PRNDL and/or battery light illuminate on the IPC. If either of these lights illuminate, replace the ignition switch.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
04-06-03-002: Diagnostic Information for Intermittent Vehicle No Crank/Dead Battery - (Feb 5, 2004)
||Diagnostic Information for Intermittent Vehicle No Crank/Dead Battery|
||2004 Buick Rainier|
|2000-2004 Cadillac Escalade|
|2002-2004 Cadillac Escalade EXT|
|2003-2004 Cadillac Escalade ESV|
|1998-2004 Chevrolet Blazer, S-10 Pickup|
|1999-2004 Chevrolet Silverado|
|2000-2004 Chevrolet Suburban, Tahoe|
|2002-2004 Chevrolet Avalanche, TrailBlazer, TrailBlazer EXT|
|2003-2004 Chevrolet Express|
|1998-2004 GMC Jimmy/Envoy, Sonoma|
|2000-2004 GMC Yukon, Yukon XL|
|2002-2004 GMC Envoy, Envoy XL|
|1998-2004 Oldsmobile Bravada|
When diagnosing a concern regarding an intermittent vehicle no crank or dead battery, technicians should remove and reinstall the ignition switch using the Ignition Switch Replacement procedure in the Steering Wheel and Column section of SI. The ignition switch may have been misindexed in the steering column during a previous replacement .
If the ignition switch is misindexed in one direction, the ignition switch circuits will not be completely open when the ignition switch is in the OFF position with the key removed. This may result in lights remaining on or instrument panel lights illuminating, which will drain the battery. If the ignition switch is misindexed in the opposite direction, the ignition circuits will open correctly but the ignition switch may not close the crank circuit properly when the ignition key is turned to the crank position. This will result in a no crank concern.