CEM monitors the parasitic drain in cars with battery monitoring sensor BMS, the quiescent current is sampled every minute when car is parked. The average value from the last 24 hours can be read when you connect VIDA on the next day. Actually, this value is also available in Car Scanner Elm Obd2 app.
VIDA or Car Scanner needs to be connected just for a minute in the morning, so it probably has no impact on the measurement of parasitic drain. But car needs to be equipped with BMS sensor to read these values - if VIDA or Car Scanner displays the state of charge SOC of the main battery, you can also see the quiescent current average.
So without a multimeter, you can probably disconnect one fuse at a time and leave the car overnight to detect if quiescent has dropped.
Generally, as the diagnostic port has constant power feed even when car is locked, the elm327 adapter should be removed after each use, otherwise it might drain the battery.
screens in Car Scanner Elm Obd2
Last edited by piotrek; May 14th, 2021 at 07:44.
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