Mobokey allows the user to lock and unlock the car using a smartphone! Generally, we have seen two types of locking systems in a car. Single wire locking and Double wire locking systems. Here we will discuss Single wire locking systems.

Single wire locking system

The single-wire locking system is used by some European car manufacturers. These manufacturers include BMW and Mercedes, in some models only.

As the name suggests, this locking system comprises one wire responsible for locking and unlocking the car. 

Application Configuration

In the application, the Double wire system is set by default.

Select Car Profile>Car Settings>Locking Mode from the side menu

Select Single Wire.

Once you have selected, you will have to choose the feedback wire. You can either select Unlock or Lock.

After that, you will lock and unlock the single-wire system.

MoboKey Pro Lock/Unlock Installation

The power window module has a lock/unlock button. Usually, this button operates on a negative trigger. You need to find those wires by using a multimeter or a light tester.

To determine the wires, shift the multimeter to voltage. Connect one end of the multimeter to the positive wire, and the other end to different connection points in the door module and press the lock button. The voltmeter would show a reading when the correct lock wire is determined. Press the unlock button in the window module and the voltmeter would show the reading again. This would be the single wire responsible for locking and unlocking.

The grip 3 with 8 8-pin connector of the Mobokey module is for lock/unlock and indicators. Connect (10&13) (Pink) to Ground and leave (12&15) (Grey) floating. Connect 14(Blue) to the traced wire.

Make sure to check the connections by locking and unlocking them from the smartphone app. There are two possibilities for connecting the wires.

  1. By opening the door trim and connecting Mobokey wires directly to the wires coming out of the power window module grip.
  2. By tracing these wires back to the car column below the dashboard on the door side and connecting wires there instead of opening the door trim. This method is highly recommended and is easier to implement in the long run.

Feedback wires

The grip 2 with 4 pin connectors of the Mobokey module is for the feedback wires. You will have to trace the wire and connect it to the door. If you find the feedback wire with the ground then connect it with 4(Ground Input) Blue-White or if you found 12 V feedback then connect it with 5(12 V Input) Green-White wire!

car lock smartphone CAM Basic and PlusCAM Plus/Basic Lock/Unlock Installation

The application will be configured just the same way since the app is the same.

The wires for the lock wire (7) are blue and unlock wire (6) is green. While installing the device, for single wire, we will only use Blue wire i.e. lock.

Feedback wire

You will have to trace the wire for the door feedback. If you find the feedback wire with the ground then connect it with 9(Ground Input) Grey or if you found 12 V feedback then connect it with 8(12 V Input) Pink wire!

Download your application here: Go to Play Store or App Store!

Get more info about MoboKey: Lock and Unlock your car from a smartphone

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