No Fault: Solid green
Level: Solid red
Temp: Off
4. To change the test mode, press and hold the RS button until the No Fault LED changes state
(about 10 seconds). If in NiCad mode, the LED will be solid green. If in lead-acid mode, the
LED will start flashing.
4.3 Verify Sensor Voltage
While unlikely, it's possible the ELM sensor isn't receiving the required voltage for normal
operation. Each sensor has a minimum working voltage of 5.5 volts DC.
1. Remove the sensor cover.
2. Using a meter, measure the voltage at the points shown below. Note that it doesn't matter
which side the ribbon cable is connected to, the measurement points are the same.
3. If the voltage is under 5.5VDC, replace the ribbon cable. If the voltage is still low, it could be
the Vigilant sensor.
4.4 Move ELM Sensor
The most unlikely scenario for erroneous ELM alarms could be interference from something inside
the battery jar. This can be challenging to troubleshoot because it could only affect a handful of
ELM sensors on the same battery. One example of this could be an internal post that is reflecting
light back at the ELM infrared sensors.
The only way to troubleshoot this issue is if something is visibly in line of the ELM sensor, try
moving the sensor to a different spot on the battery. In some scenarios, this can resolve false
alarms on cells that are problematic.
