User's Manual

Sheet 4 of 5
JANUS Permanent OBU Mounting Instructions
for Passenger Vehicles
WARNING: The user is recommend to follow these instructions carefully and mount the JANUS Permanent OBU correctly
on the first attempt. Once mounted removal from the windshield will result in permanent disablement of the OBU.
The JANUS Permanent OBU (Fig-7) is sensor equipped for detection of removal from the windshield.
Fig-7: JANUS Permanent OBU Front and Side Views
1. Identify the front face of the OBU. It displays your agency label and two upward-pointing arrows (Fig.-7). This side
faces the driver with the arrows pointing toward the roof of your vehicle.
2. Identify the position in your vehicle in which the OBU will be mounted. The preferred location is between the exposed
edge of the windshield (roofline) and the rear view mirror post as long as the clearances in Fig.-2 can be maintained. If
there is insufficient room, the alternate location shown in Fig.-3 must be used.
3. Prepare the surface of the windshield for application of the 3M™ VHB™ acrylic foam tape adhesive per the
instructions supplied on the last sheet of this document. Next carefully remove the protective backing from the 3M™
VHB™ acrylic foam tape strips on the rear of the JANUS Permanent OBU (Fig-8) and firmly press the rear of the
OBU against the glass. Maintain the pressure for about 15 seconds to achieve a good bond.
Fig-8: JANUS Permanent OBU Rear Face
Sensor
3M™ VHB™
Tape Strips
Peel off backing