Circuit/System Description

Components most likely to cause a parasitic draw on the vehicles battery are switches, relays, and control modules. After the ignition is turned OFF the control modules will begin to go to sleep (shut OFF). All control modules do not go to sleep at the same time, some may take up to 30 minutes or longer after turning the ignition off before going to sleep e.g. RAP or IRAP. Other components such as EVAP, HVAC afterblow, EV Battery Heater/Coolers, OnStar and keyless entry control modules (approach detection in keyless access vehicles) etc. may periodically wake up then go back to sleep. These are all normal conditions, use of a DMM set to Min/Max may help identify the normal types of spikes in the parasitic draws.