Battery Management System (BMS) ECU Repair Procedures

Inspection

C-CAN Load Resistance Inspection (Multi-Purpose Check Connector)

1. 1
   Turn the ignition OFF.
2. 2
   Measure the resistance between terminals No. 20 and No. 17 of the multi-purpose check connector (20-pin). Measure the resistance between terminals No. 3 and No. 11 of the DLC connector (16-pin).

   

   Specified value: approx. 60 Ω

3. 3
   If the measured value does not meet the specification, check the terminating resistance between the BMS ECU and the inverter.

C-CAN Load Resistance (BMS ECU)

1. 1
   Turn the ignition OFF and disconnect the negative (-) terminal of the auxiliary battery.
2. 2
   Raise the vehicle.
3. 3
   Loosen the mounting nut, then remove the front lower cover of the high voltage battery (A).

   

4. 4
   Disconnect the BMS ECU extension connector (A).

   

5. 5
   Measure the resistance between terminal No. 2 (CAN-High) and terminal No. 9 (CAN-Low) of the BMS ECU.

   Specified value: approx. 120 ?

   

Removal

Be sure to read and observe the "General Safety Information and Caution" before performing any work on the high voltage system. Failure to follow the safety instructions may result in serious electrical injury. Before performing any work, be sure to disconnect high voltage related to the high voltage system (refer to "High Voltage Disconnection Procedure"). Failure to follow safety instructions may result in serious electric shock.

1. 1
   Disconnect the high voltage. (Refer to Electric Vehicle Battery System - "High Voltage Disconnection Procedure")
2. 2
   Remove the high voltage battery assembly. (High Voltage Battery System - Battery Pack Assembly - "Removal")
3. 3
   Remove the safety lever cable bracket mounting bolt (A). Safety lever cable bracket mounting bolt: 7.8 ~ 11.8 N·m

   

4. 4
   Loosen the mounting bolt and remove the upper case (A). High voltage battery upper case mounting bolt: 7.8 ~ 11.8 N·m

   

5. 5
   Remove the BMS control unit.

   1. Disconnect the connector (A).

      

   2. Remove the mounting nut (B).
   3. Remove the BMS ECU (C).

      BMS ECU nut: 7.8 - 11.8 N·m

      

Installation

Be sure to read and observe the "General Safety Information and Caution" before performing any work on the high voltage system. Failure to follow the safety instructions may result in serious electrical injury. Before performing any work, be sure to disconnect high voltage related to the high voltage system (refer to "High Voltage Disconnection Procedure"). Failure to follow safety instructions may result in serious electric shock.

1. Install the BMS ECU in the reverse order of removal.