LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Damaged Light

Sensor Verdict: The LCM system generated a BLACK circuit alert on trailer WV2501819, indicating a potential fault in the Clearance/License Plate lighting circuit. Based on the available evidence, the outcome is rated Inconclusive with a confidence of 42. The vendor found no active fault, and the PCT app shows all circuits 'Verified,' but the absence of live telemetry data (all circuits show 'No data' in the TechAssist screenshot) prevents full confirmation that the alert was a false positive versus a transient or intermittent fault that had self-resolved by the time of inspection.

Photo Evidence: Fourteen timestamped field photos were provided along with one PCT TechAssist screenshot. Photos confirm the trailer unit WV2501819 (Indiana plate PE28987, Wabash VIN 1JJV532D1SL555976). Clearance/marker lights are visible and illuminated in photos TC_05001, TC_05002 (front corners — amber), TC_05005, TC_05006 (red side markers), TC_05007 (top rear marker lights — red), TC_05003 and TC_05004 (side amber turn/marker lights), and TC_05011/TC_05008/TC_05009 (rear view showing brake/tail lights operational). The nosebox wiring photo (TC_05013) shows the junction box open with multiple wires, connectors, and what appears to be a red inline fuse holder — the wiring appears complex and somewhat disorganized, though no obvious damage or corrosion is clearly documented. Critically, no dedicated, close-up photo of the license plate light specifically illuminated was provided, which is the primary component associated with the BLACK circuit alert. The PCT screenshot (IMG_5257) shows all five circuits (Red, Green, Yellow, Brown, Black) marked 'Verified,' but all circuits simultaneously display 'No data' for live readings, suggesting the system may not have been connected to a live tractor power source during verification.

Vendor Compliance: Vendor compliance is partial but deficient in key areas. The technician did use the Phillips Connect TechAssist app and captured a screenshot showing all circuits marked 'Verified,' which satisfies the app-usage requirement in principle. However, the 'No data' status on all five circuits is a significant concern — proper PCT verification typically requires a tractor hookup to generate live current readings, and without those readings, the 'Verified' status may reflect only a manual sign-off rather than a true electrical load test. Additionally, the vendor did not photograph the license plate light specifically illuminated, which is the light directly tied to the alerting BLACK circuit. The technician's notes are very brief and do not reference specific PCT observations, steps taken, or the feedback category language required by the troubleshooting procedure. The cause is listed as 'TBD,' which is non-compliant with the expectation of a definitive feedback category.

Repair Summary: No repairs were made and no parts were billed. The technician concluded all lights were functioning as expected. While this outcome is plausible — LCM alerts can be triggered by transient faults, loose connections that re-seated, or brief voltage drops — the lack of any corrective action combined with insufficient diagnostic documentation means there is no verifiable confirmation that the underlying cause of the alert was identified or resolved. The alerting BLACK circuit was not specifically addressed beyond a general visual inspection.

Key Concerns: Several flags are worth noting for this work order. (1) The PCT app shows 'No data' on all circuits simultaneously, strongly suggesting the trailer was not connected to a tractor during the TechAssist verification — this undermines the validity of the 'Verified' designations. (2) No close-up photo of the license plate light illuminated was captured, leaving the specific alerting component undocumented. (3) The nosebox photo (TC_05013) reveals a notably complex and cluttered wiring configuration with a visible inline fuse — while no damage is confirmed, this warrants closer inspection as a potential source of intermittent faults. (4) The vendor cause is listed as 'TBD,' which does not satisfy the required feedback category. (5) A strap (yellow ratchet strap) is hanging loose from the trailer in multiple rear photos — not a lighting defect, but suggestive of a rushed or incomplete pre-departure inspection. Overall, while no active defect was found, the quality of documentation and the validity of the PCT verification are insufficient to conclusively close this alert as a confirmed false positive.