LCM Alert Validation

Confidence

Failure Category

No Fault Found

Subcategory

No Fault Found

Sensor Verdict: The LCM sensor alert on the RED (Brake) circuit is assessed as a legitimate 'Defect Detected' with 88% confidence. The technician's findings directly corroborate the alert — a loose wiring connection at the lower stud of the nosebox/gateway was identified as the root cause. This type of intermittent or degraded connection is precisely the class of fault the LCM system is designed to detect. There is no contradicting evidence; the repair addressed the alerting circuit and the system was subsequently verified as fully functional.

Photo Evidence: Five photos were submitted with this work order. Photo 1 shows the side of a blue trailer (unit V506991) with identification markings visible on a structural rail — this appears to be a unit confirmation/context photo. Photo 3 shows the rear of the trailer with the doors slightly ajar, rear lights illuminated (red LEDs visible and lit), and reflective tape in good condition — this serves as a post-repair light verification photo, though it captures only the rear cluster rather than each individual light in the full circuit. Photos 2 and 4 show the nosebox interior at two zoom levels: Photo 2 provides an overview of the full junction box with multiple colored wires connected to terminal studs, appearing crowded and aged but functional; Photo 4 is a close-up showing significant corrosion and oxidation on the terminal studs and ring terminal connectors, with some connectors showing discoloration and grime buildup. Photo 5 is the TechAssist app screenshot confirming all five circuits (Red, Green, Yellow, Brown, Black) are marked 'Verified' with the Red circuit noting 'Defect/s resolved.' The nosebox photos are present and informative, but individual illuminated light photos for each lamp in the red circuit (e.g., brake lights individually lit) were not provided. The corrosion visible in Photo 4 is a notable concern beyond the immediate loose connection.

Vendor Compliance: The vendor demonstrated reasonable compliance with the LCM troubleshooting procedure. The TechAssist app was used and a completion screenshot (Photo 5) was provided showing all five circuits verified green, which is explicitly required. A nosebox photo was provided (Photos 2 and 4). However, the procedure requires photos of each light illuminated in the circuit; Photo 3 shows the rear lights on but does not individually document each lamp position in the red brake circuit. The vendor's notes are adequately detailed, identifying the root cause (loose connection/wiring at lower stud in gateway) and the corrective action (tightening), and map to the expected feedback category of 'loose connection in nosebox.' Overall compliance is satisfactory but not fully complete due to the missing individual illuminated light photos.

Repair Summary: The repair consisted of tightening a loose wiring connection on the lower stud of the nosebox associated with the red circuit. No parts were replaced per the available line items, which indicates a mechanical/connection fix rather than a component replacement. The alerting circuit (RED/Brake) was directly addressed. No other circuits were reported as defective, and the TechAssist screenshot confirms all circuits passed post-repair verification. The absence of parts line items is consistent with a tighten-only repair, though the corrosion observed in the close-up nosebox photo (Photo 4) may warrant future preventive attention.

Key Concerns: The primary concern flagged from this work order is the visible corrosion on the nosebox terminal studs and ring connectors seen in Photo 4. While the immediate defect was a loose connection, the corrosion could degrade connections over time and may trigger future LCM alerts on this or other circuits. It is recommended that the nosebox corrosion be documented as a watch item or addressed proactively with cleaning and dielectric compound application. A secondary minor concern is the incomplete photo documentation — individual light illumination photos for the brake circuit positions were not provided. No mismatched circuit colors, bypassed LCM inserts, or signs of repeat issues are evident in this work order.