LCM Alert Validation

Confidence

Failure Category

No Fault Found

Subcategory

No Fault Found

Sensor Verdict: The LCM system generated an alert on the BLACK circuit (clearance/license plate lights) for trailer WV2501447, indicating a detected short in the lighting system. Based on the vendor's findings, confidence in an actual persistent defect is moderate-low (42%). The TechAssist app ultimately verified all circuits as functional, suggesting either a transient fault (intermittent short that self-cleared), a false positive from the LCM sensor, or a condition that existed at the time of the alert but was resolved before or during inspection. The DoorV sensor shown as undetectable in Photo 7 is a separate telematics concern unrelated to the lighting circuit alert.

Photo Evidence: The photo set is extensive and covers multiple angles of trailer WV2501447. Photos 2, 4, 9 show the rear doors with visible rear lighting clusters; all rear lights appear intact and undamaged. Photos 1, 13, 17, and 18 show the curbside rear corner with tail/marker lights illuminated red, appearing functional. Photos 5 and 10 show the road-side front upper corner with a clearance/marker light (amber) visible and appearing lit. Photo 8 shows a close-up of the license plate area and the license plate light, which appears intact. Photo 15 shows the nosebox open with wiring visible — the wiring appears complex and somewhat disorganized, but no obvious damage, corrosion, or bypassed LCM insert is clearly identifiable from the image alone. Photo 16 shows the top rear clearance lights illuminated red, confirming those are operational. Photos 11 and 12 are critical TechAssist app screenshots: Photo 12 shows all 5 circuits (Red, Green, Yellow, Brown, Black) listed as 'Verified' prior to final system verification, and Photo 11 shows the system-level 'Verified' confirmation popup stating 'The Light CircuitV verified successfully.' However, individual photos of each specific light illuminated during circuit testing are not present, which is a gap in documentation compliance.

Vendor Compliance: The vendor (COX) partially followed the LCM troubleshooting procedure. Positively, they did connect to the trailer via the Phillips Connect TechAssist app and progressed through all five circuits, providing app verification screenshots. However, the procedure explicitly requires photos of each light illuminated during testing and a clear nosebox wiring photo. While a nosebox photo was provided (Photo 15), it is not fully clear and does not show all wiring connections in detail. Individual illuminated-light photos for each circuit test are absent — the photos show the trailer in general but do not systematically document each circuit's lights being activated. Additionally, the technician's notes do not provide specific feedback from the required category list (e.g., stating 'no defect found (confirmed with PCT)' explicitly), though the app verification screenshots do serve as partial confirmation. The door sensor issue (DoorV undetectable) was observed in Photo 7 but does not appear to have been separately written up or escalated.

Repair Summary: No repairs were made to the trailer lighting system. The labor line item of $102.00 was billed under 'clearance/marker/inter' lighting for manual labor, which appears to reflect diagnostic/inspection time rather than any physical repair. No parts were replaced, no bulbs were swapped, and no wiring corrections were documented. Since no defect was found and no repair was performed, the question of compliant brand usage is not applicable. The alerting BLACK circuit was tested and verified functional via TechAssist but was not physically repaired.

Key Concerns: Several concerns warrant attention. First, the root cause of the original LCM alert (short in the BLACK circuit) was documented as 'UNKNOWN' — no explanation was provided for why the sensor triggered. This is a documentation gap that leaves ambiguity about whether the fault was transient or intermittent. Second, the DoorV sensor shown as 'cannot be found by the gateway' in Photo 7 is an open telematics issue that does not appear to have been addressed or written up separately — this should be flagged for follow-up. Third, individual illuminated-light photos per circuit are missing, which is a direct deviation from the required troubleshooting procedure. Fourth, while the TechAssist app showed all circuits verified, the timing of the verification relative to the original alert is unknown — if the fault was intermittent, it may recur. The work order should be flagged for monitoring to detect any repeat LCM alerts on the BLACK circuit in the near term.