Circuit/System Description

The instrument panel module (IPM) has designated circuits for monitoring vehicle system voltage. The IPM monitors the system 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 IPM monitors the system voltage over an extended length of time. If the IPM detects the system voltage is outside an expected range for the calibrated length of time, or the IPM battery sense circuits differ by 3 V DTC B1517 will set. Other modules also monitor system voltage the system voltage message is sent to the other modules and will default to 12.9 V.