Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

Test for a fully engaged high voltage manual disconnect lever whenever an open HVIC condition is observed. The manual disconnect lever must be pressed down fully in order to engage the HVIC terminals.
The BECM HVIC source and HVIC return circuit current sensors may not measure actual circuit current with the same accuracy. The BECM HVIC Source parameter may indicate less current than the BECM HVIC Return parameter for this reason. Measuring actual HVIC current with a DMM may also not compare directly to the parameter display.
The HVIC detects removal of the following components:
- The drive motor generator control module sight shield
- The transmission 3 phase cable cover
- The high voltage manual disconnect lever
- The hybrid battery terminal extension cover assembly
The HVIC is also routed through several inline connectors.
With the ignition in the OFF position, the BECM will source the HVIC current for 5 minutes every time a vehicle door is opened.