6 Channel 12-24v Vehicle Light Failure Monitor

VLMS6 – 6 Channel  Vehicle Lamp Failure Monitor Systems

6 Channel 12v / 24v Light Failure Monitor Product Brochure Download

VLMS-6, 6 Channel Lamp Failure Unit (24v Model)

Key Features

Failure Monitoring of up to 6 individual lamp circuits
Signal and Emulation Modes
Configurable Failure Thresholds of 10mA, 25mA and 50mA
Ideal for Direction Indicators, Brake and Marker Lights
24VDC Application (other voltages available)
EMC Approved


The 6 Channel unit connects in-line with vehicle lighting circuits to passively monitor up to 6 separate low power light circuits. When the load of a circuit falls below a configurable threshold, due to a partial failure or an open-circuit, individual outputs provide failure feedback. The 6 channel unit can be configured to operate in either Signal or Emulation modes – providing a universal solution for the legal requirement of direction indicator monitoring.

Signal and Emulation Modes

In Signal mode, the feedback output becomes active when a failure has occurred – this mode is ideal for controlling a dedicated warning light or buzzer, or for activating an audible message when connected to one of Nortek’s vehicle annunciator products.

In Emulation mode, the feedback output is inverted to provide a ground connection while the circuit is operating correctly – this output can be used to control the connection of a ‘bulb emulating’ load resistor, when the controlling circuit is configured for a 21W bulb. When a failure is detected, the output becomes open circuit, thus disconnecting the load resistor.

Configurable Failure Thresholds

The 6 channel unit has three configurable failure thresholds of 10mA, 25mA and 50mA. When the load of the circuit falls below the set threshold, the failure feedback is activated. These low current thresholds allow LED lights as low as 0.25W to be monitored


VLMS6E 6 Channel 12v Light Failure Monitoring System

Key Features

Failure Monitoring of up to 6 individual circuits
Signal and Emulation Modes
Protected against reverse polarity and transients
Ideal for Direction Indicators and Marker Lights
Wide Range 12V – 24VDC Application (other voltages available)
EMC Approved


The 6 Channel 12v monitors the health of up to 6 vehicle circuits. Nominal lamp loads are taught via a calibration procedure during installation. Seven status outputs are provided; these report lamp health and will normally be connected to a vehicle ECU.

Signal and Emulation Modes

The 6 channel 12v has two operating modes; the required mode is selected during installation.

Signalling Mode

An individual fault output will switch ON when its associated channel lamp is faulty.
A single Global fault output will switch ON when any of the monitored lamps are faulty

Load Emulation Mode

A fault output will be kept switched on for as long as its associated lamp is healthy. Emulation mode is intended to mimic the presence of a filament bulb; the status output being used to switch a load comparable to the lamp being emulated. This is intended for use on vehicles which expect filament bulbs to be fitted. Note that the load resistors will generate a lot of heat.

How the 6 channel 12v unit works

The installer performs a calibration procedure, during which unit learns the feed voltage and current consumption of attached lamps. We refer to these as the nominal feed voltages and currents. During operation, the unit reports a lamp as being faulty if that lamp’s current consumption falls below 60% of its normal value.

For Further Information on our range of Vehicle Lamp Failure Monitors please use the enquiry form below.