Rear fog is controlled by CCU output, then via relay to lamp. Switch sends ground to CCU so wiring or switch or relay problem could be the cause. Pull switch and check for continuity pins 1 and 4 when pressed and open.
Rear fog is controlled by CCU output, then via relay to lamp. Switch sends ground to CCU so wiring or switch or relay problem could be the cause. Pull switch and check for continuity pins 1 and 4 when pressed and open.