After fixing the issue, clear the codes:
Volvo changed pin assignments subtly over the years. If your brick’s diagram shows Pin 5 for Cruise Control but you get no blink response, try Pin 3. Late-model 940s moved ABS to Pin 3, and some turbos moved ignition diagnostics to Pin 5. volvo brick diagrar top
If your 240 lacks the black box, you have the early “diagnostic port” – a round or rectangular connector. You will need a homemade test light. After fixing the issue, clear the codes: Volvo