Zonar LMU-2630 Lights, Wiring and Technical Information

How Do You Read the LMU-2630 Lights?

The LMU-2630 has two LEDs. The orange light reports the cellular connection and the green light reports GPS. Solid orange and solid green together is the ideal state. Blinking means the unit is still searching or not fully registered. Tap any pattern to watch it and hear what it means, or play a normal power-up.

🔇 The LMU-2630 has no beeps of its own. Watch the two lights.

Easy way to remember it: orange is the phone, green is the satellites, and both solid is done. An optional driver buzzer can be added for driver alerts.

Tap a light pattern to see it

Each button plays the pattern on the drawing above, says out loud what it means, and tells you what to do.

Cellular light (orange)GPS light (green)Both lights

What Does Each LMU-2630 Light Mean?

Light	Pattern	Meaning
Both	Off	Modem off
Both	Solid green and solid orange	Ideal connection
Orange	Slow blink	Searching
Orange	Fast blink	Network available
Orange	Solid	Registered and receiving acknowledgements
Orange	Alternating solid and fast	Registered but no acknowledgement
Green	Slow blink / fast blink / solid	GPS on / time sync / GPS fix

What Does a Normal LMU-2630 Install Look Like?

Mount first. Somewhere secure with no metal above it, away from heater vents, engine heat and moisture.
Three wires. Red to constant 12 or 24 V (7 to 32 V), black to chassis ground, white to a true ignition source that reads 0 V with the vehicle off, through a 3 A inline fuse. Insulate every unused wire.
Power up outdoors. Away from garages and tall buildings. The lights blink while searching.
Wait for solid. Solid orange and solid green. A GPS lock can take up to five minutes; if nothing happens after a minute or two of waiting, reposition the unit and try again.
Verify. Turn the ignition on for two minutes, then off, and confirm in the account that the location is right and the last event reads Ignition Off. If not, take a five-minute drive and check again.

How Is the LMU-2630 Wired?

Wire	Function
Red	Constant power, 12 or 24 V
Black	Ground
White	Ignition
Blue / Orange	Inputs 1 and 2
Violet / Grey	Inputs 3 and 4 (telemetry)
Green	Starter disable
Brown / Yellow	Outputs 1 and 2
Green/black, Blue/black	Serial out, serial in
White/blue	1-Bit bus data, for driver ID and temperature sensors
Pink	Analog (ADC) input

Starter disable relay. Cut the starter wire at the ignition switch. The key side goes to the relay's red wire, the starter side to its white wire, and the relay's orange switch wire to the unit's green starter disable output. It only blocks the next start and never stops a running engine.

Diagnostics. The OBD-II adapter or the J-Bus JPOD plugs into the AUX 2 port on the harness, and the adapter's white wire joins the white ignition wire reserved from the basic install.

Driver ID and buzzer. The key fob reader's grey wire goes to the white/blue 1-Bit bus and its black to ground, mounted through a 1/2 inch hole on or under the dash. The buzzer takes 12 to 24 V on its red wire and the harness brown output on its black.

Temperature sensors. Up to three on the 1-Bit bus, mounted on the trailer wall halfway between floor and ceiling, away from the refrigeration unit's airflow and never on the floor.

Sources: Zonar LMU-2630 installation guide, Zonar quick start guide. ZONAR is a trademark of Zonar Systems, Inc. Other product names belong to their owners. API Signal is an independent installer and is not Zonar.

Back to the LMU-2630 →Uses, options and install facts.Zonar Troubleshooting →Fixes for the most common Zonar install problems.

What Are Common Questions About the LMU-2630 Lights and Wiring?

Does the LMU-2630 beep?

Not on its own. An optional driver buzzer can be wired to its output for driver ID reminders and behavior alerts.

What do solid orange and solid green mean on the LMU-2630?

Ideal connection: registered on the cellular network, receiving acknowledgements, and a GPS fix.

Which wire is starter disable on the LMU-2630?

Green, which drives the starter disable relay.

LMU-2630 Technical Information