GM Service Manual Online
For 1990-2009 cars only

Status Lamp Resetting Bendix RDU Unit

After a diagnostic fault is repaired, the Bedix remote diagnostic unit (RDU) must be reset using a magnet. If the reset procedure is not successful please try using a more powerful magnet. Use the procedure described below in order to reset the RDU.

  1. Hold the magnet against the center of the RDU.
  2. Keep the magnet positioned against the center of the RDU unit for less than 6 seconds.

The RDU may or may not display another fault message after the reset procedure is completed. Each fault displayed must be repaired one at a time and each reset procedure will clear only the fault which is displayed prior to resetting the system.

Additionally it is recommended at the end of resetting the RDU unit to switch off and restore power to the ABS ECU, then check the ABS warning lamp operation and RDU tool to see if they indicate any remaining DTCs.