Power Supply: Introduction

The power supply is regulated principally by the power module. Amongst other things, the power module monitors the battery charge state and the vehicle's off-load current consumption.

The following modifications to the power module are to be introduced in March 2005 with the Model Year measures:

Modified hardware and software
CAS and DME connected to terminal 30LM

(CAS = Car Access System; DME = digital engine electronics; LM = light module)

NOTE: Power supply to digital diesel electronics via power distributor.

Power is still provided to the digital diesel electronics (DDE) via the fuse box in the engine compartment.

Until now, the power module only cut current from the current paths terminal 30B and terminal 30U in the event of an off-load current violation.

This meant that an off-load current violation could only be detected using the current at terminals 30U and 30B.

A new feature is that terminal 30LM is now also switched by the power module. However, current measurement is not possible at terminal 30LM. Increased off-load current consumption is indirectly detected by the monitoring of bus communications on the K-CAN. (K-CAN = "body controller area network").