I am troubleshooting the 1985 500sel sunroof system since it it is not functioning. It used to work with some good push at the switch, now it completely stop working. The motor in the trunk does not make any click. I assume it is either the switch or motor. The fuse is good.

I look at the fastlane for parts but surprisingly found there is a relay designated as sunroof relay that I can't figure out exactly where it is located.

Input, please?