LCM Alert Validation

Confidence

Failure Category

No Fault Found

Subcategory

No Fault Found

Sensor Verdict: The LCM alert was generated on the RED (Brake) circuit of trailer V571111. Based on the available evidence, no active lighting defect was confirmed at the time of the vendor's inspection. The PCT app screenshot shows all five circuits verified with no defects logged. Confidence is moderate at 62% — the tightening of nosebox terminals suggests a transient loose connection may have been the root cause of the original alert, meaning the sensor likely detected a real intermittent fault that had self-cleared or was resolved by the terminal tightening before formal circuit testing was performed.

Photo Evidence: Photos provided cover a broad range of the trailer's lighting system. Photos TC_07865 and TC_07866 show the rear dual lamp clusters (both sides) illuminated in red, with LED lamps functioning. TC_07864 and TC_07871 show small oval marker/clearance lights at the rear corners illuminated red. TC_07863 and TC_07872 show amber/orange side marker lights illuminated. TC_07862 and TC_07861 show the forward upper corner clearance lights (amber) functioning. TC_07870 shows the license plate light illuminated. TC_07869 shows the top rear clearance lights (red) illuminated. TC_07868 and TC_07867 provide overall rear views of the trailer with all visible lights on. TC_07859 shows the nosebox (Smart 7 junction box) with wiring connections — this is a valid nosebox photo though the image shows some age/wear on the wiring and terminals, consistent with the tech's note about tightening terminals. TC_07858 shows the 7-way plug receptacle. IMG_1883 (PCT Sensor Details) confirms all 5 circuits verified. IMG_1884 (Job Summary) confirms Light Circuit sensor verified. Notably absent are dedicated individual photos of each brake light illuminated in brake/stop mode versus running light mode — the photos show red lights on but do not definitively distinguish brake activation. The ATIS Lamp sensor is shown as 'Not Connected / Unverified' in IMG_1870, which is a separate concern not related to this WO.

Vendor Compliance: The vendor followed the LCM troubleshooting procedure reasonably well. The PCT TechAssist app was used, and the Job Summary screenshot confirms 'Light Circuit✓' as a verified sensor. The Sensor Details screenshot confirms all five circuits (Red, Green, Yellow, Brown, Black) are marked 'Verified.' The nosebox was inspected and terminals were tightened. Photos of individual lights illuminated were provided for multiple circuit types. However, photos do not include a dedicated test of only the RED/brake circuit (e.g., brake pedal applied), which would have been the most targeted confirmation of the alerting circuit. The feedback category provided ('no defect found confirmed with PCT') aligns with expected troubleshooting outcomes.

Repair Summary: No hard lighting components were replaced. The primary corrective action was tightening all terminals in the Smart 7 nosebox, which likely addressed the intermittent connection that triggered the RED circuit LCM alert. Line items reflect lot labor (0.6 hrs), a PCT sensor activation charge, standard service labor (0.1 hrs), and shop supplies. No lamps, wiring harnesses, or connectors were replaced. The alerting RED circuit was not formally repaired with a parts replacement, but terminal tightening in the nosebox is a legitimate corrective action for an intermittent LCM fault. The AMAZON PCT SENSOR ACTIVATION line item confirms the smart trailer system was re-engaged/verified through the app.

Key Concerns: The most notable flag is the 'ATIS Lamp✓' sensor shown as 'Not Connected / Unverified' in the Gateway Details screen (IMG_1870), which warrants a separate follow-up but is outside the scope of this RED circuit WO. The nosebox photo (TC_07859) shows some wear and corrosion on terminal connections, which is consistent with the need to tighten terminals — this wiring condition should be monitored. The PCT Sensor Details screen (IMG_1883) shows 'No data' for all circuits under cloud sync, suggesting the data may not have fully uploaded to the cloud at time of screenshot, which is a minor documentation gap. Overall, the repair approach was appropriate and the PCT verification provides adequate closure for this WO.