LCM Alert Validation

Confidence

Failure Category

Wiring

Subcategory

wiring installed incorrectly

Sensor Verdict: The LCM BLACK circuit alert (Clearance / License Plate) was confirmed as a legitimate defect with high confidence (92%). The technician discovered that two rear outer tail lights were incorrectly wired into the marker/clearance (BLACK) circuit, causing them to illuminate when that circuit was energized rather than the correct stop/tail circuit. This wiring fault is a direct and credible cause of an anomalous LCM reading on the BLACK circuit, as the sensor would have detected an unexpected load or incorrect current signature from lights that should not be active on that circuit.

Photo Evidence: Twelve photos were submitted with this work order. Photos 3, 4, 7, 9, 10, and 11 show the rear corner of trailer WV2502987 (AZNG WV2502987), depicting the tail light assemblies, rear structure, and an open wiring cavity with loose harness wires, a drill tool, and what appears to be lights temporarily detached or lying on the ground (Photo 6 shows a tail light removed and lying on the wet pavement). Photo 5 shows an open nosebox with clearly corroded terminal studs, multiple wire colors, and what appears to be aged/degraded wiring — this is a significant finding. Photos 1 and 2 appear to show a license plate light assembly and marker lights on what may be a different trailer (no AZNG/WV2502987 markings visible). Photos 8 and 12 show the exterior rear doors of the trailer. Critically, no TechAssist app screenshots are present, and there are no 'after' photos showing all lights illuminated on the correct circuits in a verified, energized state. The nosebox photo (Photo 5) reveals concerning corrosion on the terminal board that was not specifically addressed in the repair notes.

Vendor Compliance: The vendor did not follow the prescribed LCM troubleshooting procedure. There is no evidence that the Phillips Connect TechAssist (PCT) app was used at any point during diagnosis or verification. No green 'Verified' screenshot confirming all 5 circuits passed inspection was provided. While photos of the open wiring cavity and nosebox were submitted, there are no photos showing each light illuminated on its correct circuit post-repair. The vendor notes reference the complaint, cause, and correction in a structured format, and the identified cause (incorrect tail harness wiring) is plausible and specific — which is positive — but the verification steps are entirely absent.

Repair Summary: The technician drilled out and removed all tail lights to access the wiring harness, then reconnected the harness to restore the correct light configuration when the BLACK circuit is energized. This appears to be a complete repair addressing the root cause. However, no specific parts were listed — the line item is a placeholder ('Details to Follow'), so it is unknown whether any lights or connectors were replaced, or whether compliant/approved lamp brands were used. The corrosion visible in the nosebox (Photo 5) does not appear to have been addressed or even noted in the repair documentation, which is a concern for long-term circuit health.

Key Concerns: Several issues warrant follow-up. First, the PCT app was not used and no verification screenshots were provided — this is a direct non-compliance with the required troubleshooting procedure. Second, the nosebox shows significant corrosion on terminal studs (Photo 5) that was not documented or repaired, which could lead to future LCM alerts on multiple circuits. Third, the parts line item is a placeholder with no detail, making it impossible to confirm what was replaced or whether compliant components were used. Fourth, Photos 1 and 2 may belong to a different trailer (license plate visible does not clearly match WV2502987), suggesting possible photo misassignment. The vendor should be required to return with PCT app verification screenshots and address the nosebox corrosion.