how to troubleshoot Honda Civic 9th Generation (2012-2015) CAN bus communication errors

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle battery to prevent accidental electrical shorts.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Wire strippers and connectors
• Torque wrench

2. Inspect Harness and Connections

• Remove any protective covers from the CAN bus wiring harness.
• Visually inspect the wiring for fraying, cuts, or corrosion.
• Ensure all connectors are securely seated and clean any corrosion with electrical cleaner.

3. Repair or Replace Damaged Components

• If damage is found, splice in new wire using appropriate gauge wire and connectors, ensuring secure connections.
• If a connector is damaged, replace it with an OEM part.

4. Check Ground Connections

• Locate the ground points for the affected modules and clean them until shiny.
• Reattach ground connections and ensure they are tightened to the specified torque.

5. Verify CAN Bus Resistance

• Connect the multimeter to the CAN High and CAN Low wires.
• Confirm the resistance is within the acceptable range (around 60 ohms).
• If resistance is outside this range, further inspect the wiring for shorts or opens.

6. Reconnect Battery and Test

• Reconnect the vehicle battery.
• Start the engine and check for the presence of any trouble codes with the OBD-II scanner.
• Test all affected systems (gauges, windows, locks, etc.) for functionality.