Ascender 4WD V8-5.3L (2004)
Control Module HVAC: All Technical Service Bulletins
A/C - Dual Zone A/C Battery Draw Information
Bulletin No.: IB07-12-S005
Issue Date: November 2007
Automatic Dual Zone HVAC Battery Draw
(This Bulletin Supercedes IB05-12-S002)
Affected Vehicles:
2003-2008 Isuzu Ascender
Service Information
This bulletin is being revised to update models and model years.
When diagnosing battery draws on vehicles equipped with the automatic dual zone HVAC controls (RPO CJ2) technicians should keep in mind that the
control head does not completely "go to sleep" until after 150-250 minutes or up to 4-1/4 hours, from when the ignition key is turned OFF. This is a
normal condition. In these cases DO NOT replace the control head.
Disclaimer