LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Failed Light

Sensor Verdict: The LCM alert was issued on the Yellow circuit (Left/Road-side Turn lights) for trailer V571318. After full TechAssist app verification, the technician found no fault on the Yellow circuit — all five circuits passed with no issues detected. Confidence is moderate (72%) that a real defect existed on the trailer because a missing 3rd brake light was found and replaced, representing a genuine lighting defect even if it was not the alerting circuit. It is plausible the sensor detected an anomaly related to the missing lamp or a transient wiring issue that self-cleared.

Photo Evidence: The photo set is substantial and informative. Photos 4 (IMG_1640.png) and 18 (IMG_1639.png) show the TechAssist app — Photo 18 shows an initial 'Not Verified' state for all five circuits (sensor paired, maintenance not verified), and Photo 4 shows a final 'Verified' state for all five circuits with no defects noted, confirming proper app usage. Photos 1 and 9 (IMG_1708, IMG_1636) show the Grote replacement marker/brake light installed on the trailer door area with the FMCSA QR sticker and Grote product label visible, along with the empty mounting holes where the light had been missing. Photo 3 (IMG_1710) shows a red Grote LED light installed and illuminated on the door. Photos 2 and 16 (image.jpg, IMG_1632) show rear curbside lights illuminated red. Photos 15 and 13 (IMG_1628, IMG_1711) show rear tail/brake lights illuminated. Photos 14 and 17 (IMG_1633, IMG_1627) show amber/orange marker or turn lights illuminated. Photo 5 (IMG_1625) shows the 7-way connector in good condition. Photo 10 (IMG_1637) shows the nosebox wiring — it is open and visible with multiple circuits connected, though the image shows a somewhat cluttered but functional wiring configuration. Photos 6, 7, 8, 11, 12, 19, 20 (various) show the exterior trailer body from multiple angles, confirming the trailer identity (V571318, AZNG). Not all individual circuit lights are explicitly photographed in an illuminated state for the Yellow circuit specifically, which is the alerting circuit.

Vendor Compliance: The vendor (TA) demonstrated a high level of compliance with the LCM troubleshooting procedure. The TechAssist app was used, both a 'not verified' initial screenshot and a final 'verified' completion screenshot were captured showing all five circuits passing. The technician checked power at the 7-way pins (14V confirmed) and inspected the nosebox wiring. A nosebox photo was provided (IMG_1637). The technician explicitly noted checking the Yellow circuit and finding no issues. The feedback category 'light missing' aligns with the defined expected feedback categories, and the notes are reasonably detailed. The primary gap is that not every individual light on the Yellow circuit was photographed in an illuminated state per strict procedure requirements.

Repair Summary: The primary repair made was the installation of a new Grote LED 3rd brake/center high-mount stop light (Photos 1 and 3 confirm Grote brand, LED type, with FMCSA QR code label) that was found missing from the trailer. The light was riveted to the trailer and tested as working. No repairs were made to the alerting Yellow circuit because no fault was found on that circuit. The Grote brand is an approved, compliant OEM-equivalent lamp brand. No parts line items were submitted in the work order, which is a documentation gap — the Grote light replacement should have a corresponding parts line item.

Key Concerns: The primary concern is a mismatch between the alerting circuit (Yellow/Left Turn) and the repair made (3rd brake light — Red circuit). While the technician confirmed no fault on the Yellow circuit, the sensor alert may warrant follow-up monitoring to confirm no recurring Yellow circuit issues. The absence of parts line items for the Grote light replacement is a documentation deficiency that should be corrected for cost tracking and warranty purposes. The nosebox photo (IMG_1637) shows a somewhat disorganized wiring harness that could benefit from a closer review, though the technician reported all connections at proper voltage. Overall, the vendor performed thorough and compliant work, and the trailer was left in a verified, roadworthy condition.