Self Test of Control Module
Button "Run self test"- Press button C Run self test".
The lower row on the display shows the caption "TESTING..."
If the module is OK:
If the control module is free of faults, the caption "TEST OK!" appears on the lower row of the display.
If the control module is faulty:
If the control module is faulty the caption "ERRCODE XXX" is shown ("XXX" is a 3-digit DTC).
The DTC (ERRCODE) should always be quoted when making claims for a faulty module.