103RS GPS Tracker Teardown

Rewire Security 103RS Tracker
Rewire Security 103RS Tracker

I thought it was time to add a bit of security to the gear I take camping, so this GPS tracker unit was sourced from eBay. This is a Rewire Security 103RS, a slightly customised version of the common Chinese TK103 GPS tracker.

Input Connections
Input Connections

The small module has all it’s power connections on one end of the unit, on a Molex multi-way block. The white connector is for a piezo-shock sensor – this interfaces with the alarm functionality of the unit. There’s an indicator LED for both the GPS & GSM status, and a switch for the backup battery.

Antenna Connections
Antenna Connections

The other end has the antenna connections, microphone connection for the monitor function, along with the SIM & SD card slots.

PCB Top
PCB Top

Once the end panel is removed, the PCB just slides out of the aluminium extruded casing. It’s pretty heavily packed with components in here. A switching regulator deals with the 12v input from the vehicle battery, and is protected by a polyfuse on the right. The GSM module is hiding under the Li-Po backup cell, unfortunately the sticky pad used to secure this wouldn’t come off without damaging something. The pigtails for both the GPS & GSM antennas are permanently soldered to the board here.

PCB Bottom
PCB Bottom

The bottom of the PCB has the GPS module, and mainly input protection & bypassing components. There is a FNK4421 Dual P-Channel MOSFET here as well, probably used for switching the external relay or alarm siren. The SIM socket for the GSM modem is located here in the corner.

3 thoughts on “103RS GPS Tracker Teardown

  1. nautisch says:

    Hey there

    i have the same unit, that is almost, mine does not have the external shock sensor connector. It does work pretty well basically, but…

    the (ibviously intenal) shock sensor triggers all the time, without any external “trigger” – is there any way to permanently deactivate the shock sensor? right now it is a showstopper for me since it triggers all the time witout any reason…

    thank you
    michael

    Reply
    1. The Engineer says:

      Hi nautisch,

      To be honest I wasn’t aware that the 103 series trackers had an internal shock sensor, the two I have installed certainly don’t have any problems with false triggering, but the firmware may be different, or internal settings may be different. Unfortunately I can’t find any reference to an internal sensor in the manuals for the TK103A/B or 103RS trackers. All of them mention external sensing.

      Reply
    2. Ian Sims says:

      nautisch,
      Did you ever get to the bottom of the internal shock sensor triggering the alarm? I have a 103RS which has started doing the exact same thing as yours.
      Regards.
      Ian.

      Reply

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