Circuit/System Description

The body control module (BCM) monitors the battery voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. The BCM monitors the vehicle system voltage on the following 2 B+ circuits:

• X3 terminal 3, supplied by the HVAC fuse.
• X4 terminal 10, supplied by the RVC SNSR fuse.

If the BCM detects the system voltage is outside an expected range, or if the two BCM battery sense circuits differ, DTC B1517 will set.