jebiruph
Well-Known Member
The aux battery is the only source of power for the computers during an ESS event. The aux battery is not monitored, but it's tested prior to a cold start. If it fails the test, ESS is disabled and the error light is lit. The main battery is monitored by the battery sensor and ESS will not activate if the main battery is not sufficiently charged.The primary purpose of the Aux battery is to keep the computers stable so they don't reboot from low voltage during an ESS event. The ESS system monitors the Aux battery. If it is not sufficiently charged, ESS will not activate when stopped.
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