Circuit Description
WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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:
- EEPROM Checksum
- ROM Checksum
- RAM Checksum
- RAM Malfunction