# 01-01 12V Batteries Inspection

Make sure that the battery terminals are not corroded and that there are no loose connections (pull test), cracks, or loose clamps.

# MP-01-61-00-00-001: Inspection of the 12V batteries, cables and connections

Make sure the work can be done safely.

Deactivate the high voltage circuit 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 BMW batteries.

Batteries contain a very dangerous liquid if splashed in the eyes or on the skin. Always wear a face shield and protective clothing when working near batteries.

Disconnect the 12V batteries.

4. Make sure that all battery terminals are clean. If not, clean them with a wire brush and a baking soda and water solution. Be sure to rinse off any residue with water and allow it to dry.

With a voltmeter, make sure the state of charge of each 12V battery is within specs.

If the batteries SOC is out of specs, follow the RP-01-61-00-00-001 Troubleshooting of the low-voltage Electrical System to find the issue. In the case where the batteries must be replaced, do it as per RP-01-63-00-00-001 12V Battery Replacement.

Wiring that is damaged, worn by friction, or excessive radius can break and cause short circuits that can lead to a fire. Make sure that cables are routed properly, and connections are always clean and tight.

Inspect all the cables connected to the battery on all their length for wear, chafing, or excessive radius and that they are always held securely in place.

If an excessive radius exists, reroute the cable with the appropriate slack.

Verify the condition of the cable ties. If they are loose, tighten them and if they are broken, replace them.

Make sure the cable insulation is not discolored or shows signs of overheating. If so, the damaged cable will need to be replaced as per the
RP-01-61-00-00-003 Low-voltage Harness Replacement.

Check the battery mounting hardware to make sure it is in good condition.
Make sure the battery tray is free of foreign objects such as stones or any other road debris.

Reconnect the cables to the batteries and tighten the terminals to the specified torque.
Coat the terminals with dielectric grease.
Verify the condition of the ground cable connection to the chassis. Clean it if necessary.