Checking the door contact switch

Door contact switches for interior lighting are located in the B-pillar and C-pillar door retainers. If there are malfunctions in their functioning, check the switch.

PROCEDURE

Use a test lamp or multimeter to check the voltage at the door contact switches. If no voltage is applied to them, check the fuse first. If the fuse is OK, check the wires from the fuse box to the door. Maybe, «on the way to» a wire break or a loose plug contact is detected. Also check the switch - often the contacts can be pinched or the wire lead is corroded. Eliminate the defect and then do not forget to move the entire switch with force on the sliding surfaces back and forth and lubricate with silicone oil. If the switch is strongly clamped, then clean the sliding surfaces with gasoline for washing and lightly lubricate the contacts. If this fails, replace the defective switch. Two in one: door lock with door contact switch.