What and how is the best way to get to the rear fuse box to change the brake relay on a 05 cx90

 

A 05 xc90 does not have a brake light relay - at least not on the wiring diagram from Volvo. The brake light switch is item 3/9

 

Thanks, so the message board says check lamp, so do you think it's just the bulb?

 

I'm having a hard time finding the correct bulbs

 

Brake bulbs are #1156 - the 21 watt single filament bulbs, #67 are 5 watt small bulbs w/base, and #1157 are the dual filament 5/21 watt bulbs. The 5 watt bulbs with no base I don't remember the number but always found many of those out on each xc90 during a service! Maybe #194