Jeff is correct. The Body Control Module effects the flash.
There might be a fuse for the rear lamps but if the other rear lamps are flashing then not likely a fuse issue. Are other rear lamps flashing?
More likely the lamp has failed or the lamp socket or socket wiring. If that all checks out OK then you'll most likely have to take it to a Chevy service center for diagnosis of the BCM.
Turn Signal Lamps
The body control module (BCM) is responsible for controlling the turn signals and hazard lamps. When the turn signal switch is placed in either the left turn or right turn position, the BCM receives a signal from the turn signal switch. The BCM then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, the BCM receives a signal from the hazard switch. The BCM then will send an on-off voltage signal to all the turn signal lamps. All the turn signal lamps will flash including both IPC turn signal indicators.
Your best bet , have a qualified repair shop check it out .
SOURCE: rear axle oil seal location for chevy 3500 dually
Here is a picture step by step guide from autozone:
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Rear+Axle&partName=Drive+Train&pageId=0900c1528008f4d4&subChapterTitle=Axle+Shaft%2C+Bearing%2C+And+Seal&partId=0900c1528008f406
SOURCE: 2004 chevy trailblazer fuse box diagrams
I have front and rear a/c. The air is blowing in the back but not in the front. Don I have 2 blowers/units. Could this be a fuse?
SOURCE: Cruise control Fuse location 2008 chevy cobalt
check you brake lights. if a light goes out your cruise control wont work.
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