There is no point in locating REM D:4. This REM output is connected to the High Mount Brake Light pin 1, via just a couple of wires. So, you have already, in a sense, looked at it. The circuit that drives REM D:4 is inside the REM and is more or less untouchable.
It is more important right now to figure out why you have no driver side brake light. If you are sure that you have the correct +ve input to the bulb, and the bulb is OK, then the only remaining problem is the ground connection. With the bulb removed from the holder, use your multimeter and measure the resistance from the holder ground pin to a ground point, the negative terminal of the battery will do. The value that you get should be close to zero. If this value is close to zero and the brake light still does not light up then put the bulb back in, depress the brake and measure the voltage at the holder ground relative to ground (the battery -ve terminal for example.) If this value is zero then you have an open connection somewhere. If this value is close to the open circuit value you measure before (13.3V?) then you haven't got a ground connection yet.
2003 v70 dim high mount brake light
Just to provide closure for anyone in the future with this issue. The short circuit from the broken wires in the tailgate ended up damaging the REM. That is what caused the dim high mount. Only option is to replace the REM ($825). The driveraide brakelight issue was from the bad REM frying the light socket. Cheers to all who helped. Spot on hunches, tests and localized repairs. Saved me tons fixing those issues, dealer complimented those efforts
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