Vehicle Communication Circuit Diagnostic Report Form
Use this form to document vehicle communication circuit symptoms, inspection findings, test results, repair actions, and the final diagnostic conclusion.
Vehicle Identification
Vehicle Year
*
Make
*
Model
*
Trim / Variant
Internal Vehicle / Unit Number
Mileage / Odometer Reading
*
Diagnostic Complaint and Symptoms
Reported Issue Description
*
Main Communication Problem Observed
*
No Communication
Intermittent Communication
Network Bus Fault
Module Not Responding
Warning Light Illuminated
Data Loss
Other
When Does the Problem Occur?
*
Always
Intermittently
After Startup
While Driving
During Accessory Use
Unknown
Related Dashboard Warnings or Messages
Circuit and Module Inspection
Affected Network Type
*
CAN
LIN
FlexRay
Ethernet
Unknown
Suspected or Affected Modules/Components
*
ECM
TCM
BCM
ABS Module
Instrument Cluster
Gateway Module
Wiring Harness
Connectors
Grounds
Other
Visual Inspection Result
*
Normal
Damaged Wiring
Loose Connector
Corrosion
Water Intrusion
Blown Fuse
Other
Inspection Notes
Diagnostic Test Results
Fault Codes / DTCs Found
Scan Tool Communication Status
*
Normal
Partial Communication
No Communication
Intermittent Communication
Resistance / Continuity Test Result
Voltage Test Result
Oscilloscope / Signal Quality Observation
Additional Test Notes
Repair Actions and Conclusion
Repair actions performed
*
Parts replaced or adjusted
Post-repair verification result
*
Passed
Failed
Needs follow-up
Not performed
Final technician conclusion and cause summary
*
Technician name
*
First Name
Middle Name
Last Name
Technician signature
*
Submit Report
Submit Report
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