TechnicianVision · Knowledge base
Back-To-Basics: Broken Wires
I-CAR · October 1, 2019
Summary
This article highlights the challenges of diagnosing electrical issues in modern vehicles with complex wire harnesses, noting that collision impacts can crush or sever internal wires without showing external damage to the harness casing. It emphasizes the importance of proper electrical diagnostics over immediate parts replacement when sensors or control modules report incorrect voltage readings.
What to do on the job
Perform a thorough electrical diagnostic and voltage test on impacted wire harnesses before replacing sensors or control modules, keeping in mind that internal wire damage can exist without visible external casing wear.
How to use it
Use this document to justify diagnostic labor time for electrical troubleshooting and wire harness inspection on vehicles with collision damage, especially when dealing with intermittent ADAS or sensor faults where there is no obvious external harness damage.
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