Servicing the IBS (Intelligent Battery Sensor)

Servicing the IBS
The IBS is very sensitive to mechanical stress and strain. It is serviced as a complete unit with the ground cable. The ground cable also serves as a heat dissipater for the IBS.
Particular attention should be paid to the following points in service:
^ Do not make any additional connections at the negative terminal of the battery
^ Do not modify the ground cable
^ Do not make any connections between the IBS and the sensor screw
^ Do not use force when disconnecting the ground terminal from the battery
^ Do not pull at the ground cable
^ Do not use the IBS as a pivot point to lever off the ground terminal
^ Do not use the connections of the IBS as a lever
^ Use only a torque wrench as described in the repair manual
^ Do not release or tighten the sensor screw
A fault code is stored in the DME when the IBS is defective. The DME adopts a substitute value and assumes IBS emergency mode. IBS emergency mode boosts the idle speed in order to sufficiently charge the battery.

Note: The software in the DME and that of the IBS must match. To ensure this requirement it may be necessary to replace the IBS in connection with a software update.