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Abu,
the wires in the PDC module carry signals, so you cannot use that relay that you have. The signals do NOT have enough power/stenghth to activate that relay, and if you connect that relay to any wire in the PDC circuitry, you will disrupt the operation of the PDC and probably something else in the car.
You need to use smaller relays in order achieve your goals (see the picture and the datasheet for the relay). I would suggest getting the sensitive relay with 17mA triggering amperage, but even the regular with 37mA will work.
To pull the ground signal for your trigger wire, you need to tap into PIN 7 of the X300 plug on the PDC module (middle plug out of the three plugs on the module), that pin supplies (+) to the front of the car. Feed that tapped connection to the coil of the relay and use the trip contacts to supply your needed ground to the trigger wire.
For the power to the camera you can use a second relay and find any ignition hot wire in the trunk lid, tap into that wire for the coil of the relay, and use the trip contacts of the relay to feed directly BATTERY power to the camera - do not use any wires that you are tapping into for the power source, as that will disrupt the operation of the original equipment and will not provide sufficient power for your aftermarket equipment - most loads in the BMWs are balanced loads and any diviation from the prescribed voltages or amperages will result in undesirable operation.
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