I have an 06 Toyota Sequoia. When I press the four wheel drive or 4 low button nothing happens. I can hear the relay, but it's not engaging into 4 high or 4 low. I just bought the front diff actuator. I'm curious if it's the transfer case actuator. Like I said no lights no indication that it's even trying. Any help. Would be great. I guess I'm going to try to clean the contacts inside both and go from there.