Ascender 2WD L6-4.2L (2003)
Control Module HVAC: All Technical Service Bulletins
A/C - Programmable Control Module Identification
Information IB04-12-S002
Certain HVAC Control Head Modules Are Not Reprogrammable
Issue Date: January 2004
Affected Vehicles
2003 Isuzu Ascender
Service Information
This bulletin is being issued to notify technicians that a heating, ventilation and air conditioning (HVAC) control head module was used in production
vehicles that can only be programmed one time. The control head module was used in vehicles with both manual (CJ3) and automatic (CJ2) HVAC
systems produced between mid October 2002 through early January 2003.
The HVAC control head module used during this period cannot be reprogrammed using ITCS CD # 28 or later. The HVAC control head module part
numbers displayed on the Tech 2 are 15202099, 15202100, 15202101 and 15202102. A message will appear on the Isuzu TIS 2000 screen with a
warning not to reprogram control head modules displaying these part numbers.
If a technician attempts to reprogram the control head module, the module will lock up and become non-functional. All HVAC control head modules
have a different part number and are reprogrammable.
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