Exciter Wire Signal

The Exciter Wire Signal is connected to pin 21 of the Motronic control module, the signal is directional IN only (PIN 21 - INPUT ONLY).

The exciter wire signal is used for activation of rapid data download (Diagnostic Trouble Code extraction) via the white Data Link Connector (L-wire).

Signal Failure

^ When there is a break in the signal wiring (L-wire), the following text appears on the V.A.G. 1551: "control module does not answer".