PeachParts Mercedes-Benz Forum - View Single Post - Security Update: Central Locking Defeat for 124, 126, 210

Jeremy5848 · #5 07-28-2010, 10:52 PM

I doubt that anything would blow up. Remember that the same pump also operates the optional "orthopedic" seat cushions (no, I've never seen them either) so it must be able to handle various volumes/pressures of air.

You can certainly tap into the pump's DC supply but to do so after the timer means opening up the pump assembly (I suspect that is possible) and tapping onto the motor leads so that your solenoids would operate only while the motor was running. You would also need to run a separate air line for the driver's door lock. If you're capable and willing to do that, it appears doable and I would be very interested to see what you come up with.

Make sure the solenoids don't draw a lot of current, I don't know how much the timer can supply. You might want to measure the motor current and keep the solenoids to no more than 10-20% of motor current. The schematic shows only a box with a transistor symbol in the middle for the timer and associated electronics and I've never disassembled one but do have a spare on the shelf.

Jeremy