Circuit/System Description

The T18B Battery Charger 2 (K57B Battery Charger Control Module 2) is the secondary high voltage charger. The T18B Battery Charger 2 supplements the T18 Battery Charger when sufficient level 2 (AC) electrical current is available.

The A28 Hybrid/Electric Vehicle Battery Disconnect Relay assembly contains two high voltage contactors. The high voltage contactors allow the T18B Battery Charger 2 to be connected to the vehicle high voltage DC bus.

The K16 battery energy control module monitors the time and current it takes the T18B Battery Charger 2 bus voltage to attain the same level as the battery pack voltage. If it takes too long a DTC is set.