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Exciter Wire Signal

OPERATION
The Exciter Wire Signal is connected to pin C 13 of the Engine Control Module, the signal is directional IN only (PIN C 13 - INPUT ONLY).

PURPOSE
The exciter wire signal is used for activation of rapid data download (Diagnostic Trouble Code extraction) via the brown 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 unit does not answer".