Connecting the LPR Processing Unit to the ignition signal - SharpX X1S, X2S, X1S-CN, X2S-CN, XSU

AutoVu Hardware Guide for SharpX Mobile Installation

Applies to
SharpX X1S, X2S, X1S-CN, X2S-CN, XSU
Last updated
Content type
Guides > Installation guides
English (United States)

To power the LPR Processing Unit, you must connect it to the vehicle’s power and ignition signal. When properly connected, the system will be supplied with the vehicle's 12 VDC power when the ignition is on.

Before you begin

  • Have your 0.5A fuse ready (in-line or in the OEM fuse box using a fuse tap adapter).
IMPORTANT: These instructions do not replace your vehicle’s owner manual. If you are unsure about your vehicle’s internal wiring, see your owner manual before continuing.

What you should know

  • You can obtain the ignition signal from the fuse box using a fuse tap adapter. This adapter allows you to tap into the fused circuit and give a fused connection to the LPR Processing Unit.


  1. Identify the ignition signal from the fuse box. This should be a circuit that supplies 12V when the key is switched to the RUN position, and is off when the key is in the OFF position.
    1. With the key in the OFF position, use either a circuit tester or a volt meter to identify the fuses that are 10A or less and that do not have power.
      WARNING: Do not tap fuses that are related to the automatic braking system (ABS) or the airbags.
    2. Switch the key to the RUN position and identify which of those fuses now have power.
    3. When you have identified a suitable fuse, cycle the power to ensure that the power is on when the key is in the RUN position and off when the key is in the OFF position.
  2. Remove the ignition signal fuse and insert it into the fuse tap adapter. Install a 0.5A fuse in the added circuit holder. Install the fuse tap adapter into the removed fuse position.
  3. Connect the wire from your LPR Processing Unit’s IGN pole to the fuse tap adapter.
    Only negligible current is drawn by the IGN pole. It is simply used to sense the ignition signal.
  4. Label the connections for future service.


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