DTC P0AE6-225: EV Battery Precharge Contactor Control Circuit Low: Description

The SMRs (System Main Relays) are the relays that connect or disconnect the high voltage power system in accordance with commands from the power management control ECU.

There are 4 SMRs and 1 precharge resistor. No. 1 SMRB and No. 2 SMRB are located in the No. 1 EV battery junction block assembly, and SMRP, SMRG, and the precharge resistor are located in the No. 2 EV battery junction block assembly in the electric vehicle battery assembly.

To connect to the high voltage power system, the vehicle will first turn on No. 1 SMRB, No. 2 SMRB and SMRP to charge the vehicle through the system main resistor. Then, SMRP will be turned off after SMRG is turned on. To shut off the high voltage power system, SMRB and SMRG are turned off.