SENSOR, Intelligent Battery (IBS)

DESCRIPTION
OPERATION
REMOVAL
INSTALLATION

DESCRIPTION

The Intelligent Battery Sensor (IBS) is mounted directly on the 12 VDC battery’s negative post. The battery post clamp nut is a captive nut and the stud will break if the nut is removed.

OPERATION

The battery sensor measures, calculates and reports battery: voltage, current, temperature, state of charge and other parameters via a LIN (Local Interconnect Network) bus to a master control module (engine controller, body controller etc). The battery sensor is used to optimize vehicle performance (maintain battery charge, fuel economy etc) via the vehicles electrical system

The battery sensor is readable/diagnosable via a “scan tool” that can display all of the available parameters needed for vehicle servicing or trouble shooting.

Information the Intelligent Battery Sensor (IBS) send out on the CAN Bus is

SOC = Battery State of Charge: Percentage the residual charge of the battery in respect to its nominal capacity. In few words represents how much the battery is charged.
SOH = Battery State of Health: Send a percentage of the real capacity of the battery in respect to the nominal capacity of the battery. It’s so called because during the functioning, the battery is subject to irreversible processes that reduce its capacity to be recharged and to give energy (battery ageing).
SOF = Battery State of Function: The prediction of the minimum voltage that will be reached during a cranking phase

When the IBS is powered up for the first time or is powered after a power disconnection, it goes into a so called “recalibration” phase, where the IBS must recognize the type of battery and its characteristics and state. So in this phase the tolerances on the state functions (SOC, SOF, SOH) are greater than in normal working condition.

REMOVAL

WARNING:

Do not remove the captive nut, doing so will cause the stud to break.

Loosen the captive nut (4).

Disconnect the electrical connector from the IBS (3).

Remove the IBS sensor (5) from the battery.

Remove the negative battery cable retainer (1).

Remove the negative battery cable (2) from the Intelligent Battery Sensor (IBS) (5).

INSTALLATION

NOTE:
Connecting the negative battery cable to the Intelligent Battery Sensor (IBS) must be done before installing on the battery post.

Install the negative battery cable to the IBS (2).

Install the IBS negative battery cable retainer (1). Tighten to 16 N·m (12 Ft. Lbs).

Install the IBS (5) on the negative post of the battery.

Tighten the captive nut (4) to 8 N·m (72 In. Lbs.).

Connect the IBS electrical connector (3) to the IBS (5).