CUSTOMER CONCERN The cooling fans continue running with the ignition off and DTC C1378 is stored. CAUSE Corrosion at the brake-control power-supply connector backfed voltage through the A/C No. 2 fuse circuit and kept the fan relays energized. CORRECTION Repair the corroded brake-control power-supply connector and terminals, clear DTC C1378, and verify the cooling fans shut off normally with the ignition off.