Description:

This diagnostic trouble code, CSC 520543.04, indicates that the voltage on the CAN- line is too low, which usually suggests a short to ground. Such a condition can impair the functionality of the CAN bus, leading to communication failures and potential system malfunctions.

Reaction:

Control software functionality is limited or disabled to avoid errors and malfunctions that may arise from unreliable data communication due to low voltage.

Recommendations:

• Check for Shorts to Ground: Thoroughly inspect the CAN bus system for any shorts to ground, which may be causing the low voltage issue, and correct them.
• Measure and Adjust Voltage Levels: Use appropriate tools to measure the voltage levels at CAN- to ensure they meet required specifications and adjust as needed.
• Systematic Error Checks and Repairs: After addressing the short to ground, perform systematic error checks and repairs on the CAN bus to ensure all parts are functioning correctly.
• Reset and Test Systems: Reset all affected systems following the repair and test thoroughly to verify that the voltage levels are stable and within normal operating range.

Note:

Maintaining stable voltage levels in the CAN bus is crucial for ensuring effective communication and reliable operation of vehicle control systems. Regular electrical inspections are recommended to avoid such issues.