Hybrid Systems - Electrical Aftermarket Accessory Installation: Overview
INFORMATIONBulletin No.: 09-08-45-003E
Date: June 21, 2012
Subject: Installation of Electrical Aftermarket Accessories on 2-Mode Hybrid Full Size Trucks
Models:
2008-2013 Cadillac Escalade Hybrid
2008-2013 Chevrolet Tahoe Hybrid
2009-2013 Chevrolet Silverado Hybrid
2008-2013 GMC Yukon Hybrid
2009-2013 GMC Sierra Hybrid
Supercede:
This bulletin is being revised to add the 2013 model year. Please discard Corporate Bulletin Number 09-08-45-003D (Section 08 - Body and Accessories).
The GM 2-Mode Hybrid utilizes a sophisticated electrical architecture, with generated electrical power coming from the Auxiliary Power Module (APM) rather than a traditional alternator. For the 2008-2010 model years, the electrical capacity of the system was sized to power all the electrical features built into the vehicle but was not designed to accommodate significant aftermarket accessory electrical draw. Limitations of low draw devices (less than 25 amps total) on 2008-2010 hybrid models are outlined below for each model year and RPO.
For the 2011-2013 model years, the system has been redesigned to accommodate aftermarket accessory electrical draw as specified below. The 2011-2013 vehicles have the same 12 volt DC power delivery capability (for aftermarket accessories and equipment) as an otherwise equivalent 1/2 ton standard alternator equipped truck regardless of the attachment method. The available capacity is similar to a truck with a 160 amp alternator. The same application considerations apply.
Electrical accessories marketed through GM dealers (with GM Part Numbers) under the "GM Accessories" brand have been evaluated and meet all electrical requirements. GM only approves of the specified aftermarket electrical accessories installation as outlined below:
Note
For guidelines concerning direct battery connected accessories including high current devices (e.g. winches, power inverters, etc.) on 2011 and beyond GM Hybrid trucks, please refer to the GM Upfitter Integration website at www.gmupfitter.com. The guidelines below apply to the use of existing OEM power distribution centers and wiring. They do not address direct battery connected applications. Attachment of high current draw devices on 2008-2010 MY GM hybrid trucks is not recommended.
Important
If the BCM requires reprogramming as part of an accessory installation, the Brake Pedal Position (BPP) sensor MUST be re-calibrated on 2012 and newer vehicles.
The following will outline accessing and connecting the electrical aftermarket equipment to the vehicle power and ground as approved above.
Radio Installation Instructions (2009-2010 Silverado/Sierra Hybrids with RPOs 1HY/3SA Only)
The location for the radio power and ground can be acquired at the Mid-Bussed Electrical Connector (MBEC). The power and ground can be connected at this location without having to splice or cut into the existing wiring.
Danger
The wire harnesses and cables for the hybrid high voltage circuits are encased in an orange colored covering. In addition, high voltage components such as the Energy Storage System and high voltage cables are affixed with "High Voltage" red danger, and orange warning labels. The intermediate 42 volt system is encased in a blue colored covering, and has yellow caution labels on the components, wire harnesses, and cables. Do not remove, open, take apart, or modify these devices. Do not probe, tamper with, cut, or modify high voltage, or intermediate voltage cable or wiring.
Disclaimer