RDW Control Module

The RDW control module was only used on the early production models such as the E39 M5 and the E52 Z8. All RDW modules have been eliminated as of the 2001 model year. The newer systems incorporate the RDW functions into the DSC module, this eliminates the need for a separate RDW module.

The RDW control module is located behind the glove box in the control module carrier. in addition to the four wheel speed signals, the module receives power (KL 15), ground (KL 31) and a ground signal input from the set/push button switch in the console.

The control module is connected to the K-Bus for:

• Output display in the check control matrix or Warning Light
• Diagnostic communication through the instrument cluster with the DISplus tester or GT-1.

The control module processes the wheel speed signals and stores rolling circumference values for determining pressure losses in one or more tires.