Diagnostic Plug
The diagnostic plug is in the Corsa-B interior compartment on the left side of the fuse box.
This plug is used for connecting the engine control unit and the serial tester, TECH 1.
The bridge in the end plug between terminals "A" and "G" is no longer present as of MY '92.
A = Ground for TECH 1
B = Diagnostic excitation lead,
engine electronics
F = Voltage supply for TECH 1
G = Bidirectional data lead
H = Unoccupied
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