Audio/Electrical - No Crank/Start/Dead Battery/No Audio
TECHNICALBulletin No.: 09-08-44-018
Date: September 25, 2009
Subject: No Crank/No Start, Discharged Battery, No Audio Output From Radio (Replace Amplifier)
Models:
2008-2009 Cadillac Escalade, Escalade ESV, Escalade EXT
2008-2009 Chevrolet Avalanche, Suburban, Tahoe (Equipped with LTZ Uplevel Package)
2008-2009 GMC Yukon, Yukon XL (Equipped with SLT Uplevel Package)
Equipped with Luxury Edition Package (RPO Y91) or Premium Speaker System (RPO UQS) and Built Prior to September 29, 2008
Condition
Some customers may comment that the vehicle will not crank or start and the battery goes dead. They may also comment on a loss of audio from the radio.
Cause
This condition may be due to an internal short within the amplifier that causes the amplifier to stay awake, resulting in a battery draw/load. This draw/load on the battery could discharge the battery to the point where the battery will not have sufficient amperage to start the vehicle.
Correction
Check for normal sleep mode draw of less than 30 mA. If greater than 30 mA, remove the 30A amplifier fuse from the underhood electrical center/junction block. If the draw drops more than 10 mA, the draw is likely from the amplifier. Inspect the amplifier for a green dot (a green dot indicates vehicle already has the updated amplifier). If no green dot is present and draw is confirmed with fuse pull, replace the amplifier.
Important
Verify console connector pin contacts during every amplifier replacement.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table above.
Disclaimer