The only way to find out what is going on with your electrics is to have a full diagnostic scan done with a Tech 2 or similar scanner. It may be a problem with a control module
SOURCE: Power door locks won't work
You need to have someone or yoursef check the body control module with a compatible scan tool. Thats where the problem you are having resides. It may need a software update or replacement. You can also disconnect the battery for a few minutes, that will cause the BCM to reset and may fix it.
SOURCE: 2003 Yukon XL Front passenger side door: Electric
yes it does sound like that is your problem. try checking for used one.
SOURCE: gmc yukon has the abs & parking brake light
you have to fix the problem with ur brakes- first check the wiring ,connectors and connection clips to the abs sensors and modulator if looks ok than have truck scanned some auto stores such as auto zone / advanced auto do it for free the code will give u a start point towards fixing ur problem--visual inspection of brakes doesnt always show problem
Check your radiator fluid level, if it is low it is a good chance your heater core or the hose to the heater core has a leak. The heater core is a small version of a radiator which has the air from the blower blow across it to force warm air into the cabin of the vehicle. You will need to probe under the passenger's dash to locate the leak.
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