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Quad driver module circuit

1991 Buick skylark gs,3.3L,3 speed auto. Where is the quad driver module circuit located? What does it do?

The quad driver is located inside the computer. The quad driver controls various components such as the Check Engine light, electric cooling fan, EGR solenoid, purge solenoid, etc. If there’s a problem with the quad driver, the computer is replaced.

Tester

Thanks a lot, that explains many things. You’ve been a big help-Karl