BMW X3 Service & Repair Manual: Contents of engine electrical system general

General Information

• WORKING ON IGNITION SYSTEM
• REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS
• WELDING WORK (overload protection of control units)
• Disconnecting and connecting battery
• DISCONNECTING AND CONNECTING TEST EQUIPMENT
• COMPONENT INSPECTION
• EXTERNAL JUMP-STARTING AID
• Compression testing

HANDLING COMPONENTS AFTER FLOOD DAMAGE

Flood damage can occur if the permissible fording depth of a vehicle is exceeded. Ingress of water can cause damage to the engine (water shock) or components.

Because dirt particles generally enter into the component with the water (e.g. starter motor, wiring harness), the components need to be thoroughly inspected.

Residual moisture in the components leads to corrosion (increased contact resistance in the component), which can lead to a component failure at a later time.

If water ingress into the electrical components cannot be ruled out, it is recommended to replace the component to ensure correct functioning through the vehicle lifetime.