# 02-16 Motor control unit inspection

Make sure the work can be done safely.

Deactivate the high voltage as per the MP-01-05-00-00-001 High Voltage Circuit Deactivation Procedure for LG batteries or MP-01-05-00-00-002 High Voltage Circuit Deactivation Procedure for the BMW batteries.

Locate the MCU in front of the motor, between the chassis rails. Make sure that no sign of damage or unusual wear is visible.

Make sure that all the electrical cables that are connected to the MCU are in good shape and properly secured.

Locate the coolant inlet and outlet ports on the MCU and make sure that no leak is present (Figure 2).

Make sure the grounding point on the MCU is clean and no corrosion is present (Figure 2). If required, clean the surface and add grease.

Verify the condition of the ground strap end connected to the MCU and make sure it is properly secured.

Locate the ground strap end attached to the chassis and make sure it is in good condition.

Make sure the area where the ground strap is connected to the chassis is still protected with protective grease. Clean the surface and add grease if required.

Inspect the rubber mounts (Figure 3) that supports the MCU to make sure that they are not damaged. Verify also all the bolts to make sure they are still properly tightened.