Circuit Description
WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
At each power-up, the transfer case shift control module runs a self-test on the following functions:
- Electronically erasable programmable read only memory (EEPROM) Checksum
- Read only memory (ROM) Checksum
- Random access memory (RAM) Checksum
- RAM Malfunction