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Do C4's have a hatch release cable? I need to open the hatch, engine is out of the car. Dont want to cycle the key to accessories.
No need to "cycle the key", simply connect the battery and you should have power to the hatch release buttons. Just ensure the battery cable at the starter is well insulated.
There is a small steel cable under the carpet just below the hatch mechanism. Grab it with pliers and pull. I've pulled an engine in one of these, no way would i tape off everything and connect a battery.
I personally would not cycle the key. the ECM is grounded to the engine block (via the LH cylinder head). applying power to the ECM without a ground will damage some functions within the ECM itself. electrons are funny - they WILL seek out another path. don't let the metal case of the ECM fool you - that case is not a chassis ground, as I found out. spoken with real "dumb-***," hands-on experience!
to be on the safe side, just pull the emergency release cable.