LCM Alert Validation

Confidence

Failure Category

No Fault Found

Subcategory

No Fault Found

Sensor Verdict: The LCM sensor generated a RED (Brake) circuit alert indicating a short in the lighting system for trailer SV2603362. Based on the vendor's findings and PCT app verification, no active defect was confirmed at the time of inspection. Confidence in the 'No Defect Detected' outcome is moderate (62%) because while the technician found no fault and the PCT app verified all circuits, the sensor alert itself may have captured a real but transient condition — such as a loose connection, intermittent short, or momentary wiring fault — that self-resolved or was not present when the technician arrived. The absence of any repair activity and the clean PCT verification are consistent with a no-fault-found outcome.

Photo Evidence: The photo set is reasonably comprehensive. Photos 1, 3, 11, and 12 show rear brake lights (red LED lamps) illuminated on both curbside and roadside at the rear of the trailer. Photos 7, 18, 20, and 21 show amber/orange LED marker or turn lights illuminated on what appears to be the mid-turn or marker lamp positions on the mudflaps. Photos 2, 5, and 13 show small red and amber indicator lights (likely ABS indicator lights) visible near the trailer underframe. Photo 4 shows the nosebox (junction box) with the lid open, revealing multiple colored wiring connections — this is a useful documentation photo, though the wiring does not show obvious damage or corrosion from this angle. Photos 6 and 8 show corner clearance/marker lights at the front upper corners of the trailer illuminated in amber. Photo 9 shows the trailer front corner from below. Photo 16 shows the license plate and what appears to be a license plate lamp in a slightly dislodged or awkward position — this warrants a closer look. Photos 14 and 17 are PCT app screenshots: Photo 14 shows the Sensor Details screen with all 5 circuits listed as 'Verified' but 'Maintenance Not Verified,' while Photo 17 shows the completed verification popup stating 'The Light Circuit√ verified successfully' with 'Maintenance Verified' confirmed. Photo 19 shows the rear door area with what appears to be small red clearance lights along the top header illuminated. Overall, photos are present for most light positions, but there is no dedicated photo of all rear brake lights illuminated simultaneously from a rear-facing perspective, and the license plate lamp condition is ambiguous.

Vendor Compliance: The vendor demonstrates solid compliance with the LCM troubleshooting procedure. They connected to the trailer using the Phillips Connect TechAssist app, methodically tested all five circuits in sequence (Red → Green → Yellow → Brown → Black), and captured PCT app screenshots showing both the interim 'Verified' state (Photo 14) and the final 'Maintenance Verified' confirmation (Photo 17). Photos of illuminated lights across multiple positions are provided. The technician's notes are structured around complaint/cause/correction format and are legible. The cause is noted as 'Unknown,' which is appropriate given no active fault was found. The feedback category used ('no defect found, confirmed with PCT') aligns with the expected categories. Minor deductions: the notes contain minor spelling errors ('BALCK,' 'WIROKG') and the cause section could have been more descriptive (e.g., noting the transient nature of the alert), but these are cosmetic.

Repair Summary: No repairs were made on this work order. No parts were replaced. The single line item is a placeholder with no specific part details, consistent with a no-repair inspection. The alerting RED (Brake) circuit was tested and found operational. No replacement of lamps, connectors, or wiring was performed. The PCT app verification confirmed all five circuits — Red (Stop/Brake), Green (Right/Curb Turn), Yellow (Left/Road Turn), Brown (Running/Marker), and Black (License Plate/Clearance) — passed without detected faults.

Key Concerns: The primary concern is the ambiguous condition of the license plate lamp visible in Photo 16. The lamp appears to be a small incandescent or LED fixture mounted near the plate bracket, and its orientation or mounting looks slightly off — it is difficult to confirm whether it is illuminated or properly seated. This should be noted for follow-up. Additionally, the nosebox photo (Photo 4) shows what appear to be corroded or heavily oxidized terminal connections — while the technician did not flag corrosion, the visual appearance of the terminals warrants closer inspection on a future service visit, as nosebox corrosion is a common root cause of intermittent LCM alerts. The transient nature of this RED circuit alert (fault not reproduced) is consistent with nosebox connection oxidation causing intermittent resistance spikes. Overall, the work order is acceptably documented and the vendor followed procedure, but the potential nosebox corrosion and license plate lamp condition are flagged for monitoring.