LCM Alert Validation

Confidence

Failure Category

Wiring

Subcategory

Corrosion in wiring

Sensor Verdict: The LCM RED (Brake) circuit alert on trailer HV2303606 is assessed as 'Defect Detected' with moderate-to-high confidence (72%). The alert is corroborated by physical evidence found during the inspection — most notably, severe corrosion in the nosebox wiring junction and a visibly mismatched rear lamp assembly on the curbside. However, confidence is not higher because the Phillips Connect TechAssist app screenshots (Photos 9 and 14) show 'No data' for all five circuits including the RED circuit, which means the sensor's fault reading could not be electronically confirmed or cleared through the app at the time of inspection.

Photo Evidence: The photo set is reasonably comprehensive but has notable gaps. Photo 13 is the most significant finding — it shows the nosebox interior with extensive corrosion on the terminal studs, discolored wiring insulation, and what appears to be dried electrolyte/corrosion residue across the entire terminal block. This level of corrosion is a clear cause for circuit anomalies including false or real RED circuit faults. Photo 3 shows the rear curbside lamp cluster with a mismatched lamp — the lower lamp has a different style lens and LED pattern compared to the upper lamp, strongly suggesting a recent replacement with a non-OEM or non-matching part. Photo 2 shows both rear curbside lamps illuminated in red, appearing functional. Photos 11, 15, and 16 show small red clearance/marker lights at the rear corners illuminated. Photos 1 and 10 show amber side turn/marker lights illuminated. Photo 8 shows a very small, dimly lit clearance light near the license plate. Photos 5, 6, and 7 show the trailer ID (HV2303606) at the front corner. Photo 4 shows the front top corner of the trailer with what appear to be missing or damaged clearance light mounting holes (rusted/open holes in the header). Photos 9 and 14 are duplicate TechAssist screenshots showing 'Verified' status for all five circuits but critically displaying 'No data' for each — meaning the app connected to the sensor but received no telemetry data, which is a significant documentation and diagnostic gap. Photo 12 shows the rear door area with small red LED marker lights visible on the door edge. Overall, photos of all individual brake/stop/turn lights illuminated from a clear, documented angle are not fully provided.

Vendor Compliance: The vendor (Amerit) partially complied with the LCM troubleshooting procedure. The TechAssist app was opened and screenshots were captured (Photos 9 and 14), satisfying the minimum app-usage requirement. However, both screenshots show 'No data' across all circuits, which means no actual circuit telemetry was captured or analyzed — the 'Verified' badges shown appear to reflect manual verification steps rather than live sensor data confirmation. The technician did not provide a specific failure category feedback from the required list (e.g., 'corrosion in wiring,' 'damaged connector') in the notes — the notes are largely administrative (yard location updates, 'ping unit,' 'pv,' 'flipped to a/h') with no substantive diagnostic narrative. Photos of each individual light illuminated are present but not systematically documented per circuit. The nosebox photo (Photo 13) is excellent and is the strongest piece of compliant documentation in this work order.

Repair Summary: The line item reflects replacement of one rear lamp housing assembly (tail/stop/turn signal), quantity 1. This is consistent with Photo 3, which shows a mismatched curbside rear lamp — one lamp appears to be a newer or different OEM-style unit while the other is an aftermarket replacement with a different LED cluster pattern. The repair addresses a component on the RED (Brake) circuit, which aligns with the alerting circuit. However, there is no explicit documentation that the corrosion found in the nosebox (Photo 13) was cleaned, treated, or repaired — this is a significant omission given that nosebox corrosion is a primary driver of RED circuit faults on LCM-equipped trailers. No brand compliance information is available for the replacement lamp.

Key Concerns: Several concerns warrant follow-up. First, the nosebox corrosion (Photo 13) is severe and appears unaddressed in the repair notes or line items — if not cleaned and treated, this trailer is at high risk for repeat RED circuit alerts. Second, the TechAssist 'No data' status across all five circuits in both screenshots is abnormal; a properly functioning LCM sensor should be transmitting live circuit data, and the absence of data may indicate the sensor itself has an issue or was not properly paired during the inspection. Third, the mismatched rear lamp in Photo 3 raises a compliance concern — using non-matching or non-OEM lamps can affect circuit load readings and trigger future false alerts. Fourth, technician notes are sparse and non-diagnostic, failing to meet the documentation standards outlined in the work order complaint. The 'flipped to a/h' note suggests the work order was converted to an after-hours ticket, which may explain the abbreviated documentation. A follow-up inspection to address nosebox corrosion and verify LCM sensor connectivity is strongly recommended.