LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Missing Light

Sensor Verdict: The LCM sensor alert on the RED (Brake) circuit is assessed as a confirmed *Defect Detected* with 88% confidence. The technician's findings — a completely missing rear Grote light with no wiring run to its mounting location — represent a definitive full circuit-level lighting defect that would credibly trigger a RED circuit fault on the Phillips Connect LCM system. Brake/tail lamps at the rear of the trailer are core contributors to the RED circuit, and the absence of both the fixture and its wiring would produce exactly the kind of open-circuit or zero-load signal the LCM monitors. The evidence from the technician's notes and parts used strongly supports that the sensor correctly identified a real, physical defect.

Photo Evidence: The work order notes state 'pictures are attached' in the PV/verification comment, and the vendor's notes reference work performed at the rear of the trailer. However, based on the data provided, no specific photo descriptions are available to confirm that all required images were captured — specifically: each light illuminated in the RED circuit, a clear nosebox/Smart7 wiring photo, and a TechAssist app screenshot showing green 'Verified' for all five circuits. Without those confirmations, the photo documentation must be assessed as insufficient or non-compliant with the LCM troubleshooting procedure. The absence of a TechAssist completion screenshot is a notable documentation gap.

Vendor Compliance: The vendor did not appear to follow the LCM troubleshooting procedure as instructed. There is no mention of the Phillips Connect TechAssist app being used at any point in the technician's notes, no reference to walking through each of the five circuits in the app, and no TechAssist 'Verified' screenshot is documented. The technician did perform a manual inspection ('tested all circuits and lights and checked all pigtails') and noted that Smart7 posts were snugged, which demonstrates some diligence, but this falls short of the required systematic PCT-guided approach. Feedback was not provided using the defined expected category language from the troubleshooting procedure, which makes audit traceability more difficult.

Repair Summary: The repairs performed are well-documented in the technician's notes and are consistent with the parts invoiced. A missing rear Grote light was identified, new 12GA black wire was run (4 ft), the light was riveted in using two MAGNA-LOK rivets, and connections were made with shrink-seal butt connectors (Seal-A-Crimp 16-14). A pigtail (R/R Light Pigtail) was also replaced, suggesting connector-level damage or absence at the lamp location. Grote is a compliant, recognized brand for trailer lighting, so the replacement light meets brand compliance standards. The repair directly addresses the RED (Brake) circuit. Incidental items include a PCT sensor activation (TPMS-related), an emergency light (GDT78462 — unclear if directly related to the LCM alert), and lot service labor, suggesting some additional non-alert-related work was bundled into this WO.

Key Concerns: Several items warrant flagging for the fleet maintenance reviewer. First, the inclusion of an 'AMAZON PCT SENSOR ACTIVATION' line item under a tire/speed sensor category is unrelated to the lighting LCM alert and may indicate scope creep or bundled unrelated repairs on a single WO — this should be reviewed for billing compliance. Second, the 'GDT78462 EMERGENCY LIGHT' at $163.85 is categorized under 'Preventive Maintenance' rather than breakdown, which is inconsistent with the rest of the WO and may not belong on an alert-driven work order. Third, the complete absence of TechAssist app usage and documentation is a compliance gap that prevents full circuit verification — there is no confirmation that the other four circuits (YELLOW, BLUE, GREEN, BROWN) were verified clean after the repair. Finally, the R&R marker/clearance light labor line item categorized under 'mid trailer side turn indicator' does not precisely match the rear lamp described in the notes, which may reflect a catalog selection shortcut rather than a true mid-trailer repair — reviewers should confirm the lamp position.