LCM Alert Validation

Confidence

Failure Category

Wiring

Subcategory

light unplugged

Sensor Verdict: The LCM RED (Brake) circuit alert on trailer WV2502472 is confirmed as a legitimate defect detection. Confidence is rated at 92%. The technician's notes explicitly state the 3rd brake light was found disconnected, which directly explains why the RED circuit would have flagged. Post-repair verification via the Phillips TechAssist app (confirmed in photo IMG_8204.png) shows all five circuits — Red, Green, Yellow, Brown, and Black — verified green with no defects, validating the alert and the repair.

Photo Evidence: The photo set is reasonably comprehensive but not fully complete per protocol. Photos TC_06108, TC_06109, TC_06110, TC_06104, TC_06105, TC_06106, TC_06117, and TC_06118 document the rear trailer lighting cluster and nosebox wiring. The rear brake/tail lights (red LEDs) appear illuminated and functional in multiple photos. TC_06099, TC_06098, TC_06111, TC_06112, TC_06113 document amber side marker/turn lights in varying states — notably some amber lights appear to show partial LED illumination or inconsistent brightness, which may relate to the marker light R&R line item. Photos TC_06102, TC_06100, TC_06101, TC_06107, TC_06115 show the top clearance lights, marker lights, and kingpin/chain area. TC_06116 and TC_06114 show underslung wiring/cable bundles. IMG_8200.png shows the initial TechAssist screen with all circuits showing 'Not Verified / No Data,' confirming the pre-repair state. IMG_8204.png shows the post-repair TechAssist screen with all five circuits verified green and no defects noted — this is the critical compliance photo. IMG_8201.png documents the Red Circuit Verification test summary showing 'Defect Resolved — Repaired without replacing a light,' which perfectly corroborates the reconnection repair. The nosebox wiring photo (TC_06118) is present and shows the wiring box open, though the image quality and angle make it difficult to assess full nosebox integrity. Not every individual light position is photographed independently while illuminated, which is a minor gap in photo documentation.

Vendor Compliance: The vendor (TA) demonstrated good compliance with the LCM troubleshooting procedure. The TechAssist app was used (confirmed by three app screenshots — IMG_8200, IMG_8201, IMG_8204), the technician documented the diagnostic process, and the app's Red Circuit Verification module was specifically run and resolved. The vendor provided clear narrative notes describing the finding (disconnected 3rd brake light), the repair (reconnected wiring), and post-repair verification. The feedback category aligns with 'light unplugged' from the required category list. One procedural gap is that not every individual light in the circuit was photographed independently while illuminated — the protocol calls for a photo of each light illuminated — though the overall documentation is above average for a field repair.

Repair Summary: The repair consisted solely of reconnecting a physically unplugged 3rd brake light connector — no parts were replaced for the RED circuit defect. This is confirmed by the TechAssist summary noting 'Repaired without replacing a light.' Additionally, the work order includes a line item for R&R of one marker/clearance lamp (mid-trailer side turn indicator), suggesting a separate amber light was found defective during the inspection and replaced. This is consistent with the amber light photos showing some variation in LED illumination across side marker lamps. The 7-way plug connections were also checked and confirmed tight. Total labor includes 0.5 hours for the lamp R&R and 0.7 hours for standard service, plus a shop supply fee. All repairs appear appropriate and properly scoped.

Key Concerns: There is a minor billing concern — two 'LITE MECHANICAL / Indirect charge' line items appear duplicated with no quantity or cost differentiation, which should be reviewed for billing accuracy. The ATIS troubleshooting line item (tire inflation system) appears unrelated to the lighting defect and may represent bundled services from a concurrent inspection; this should be confirmed as legitimate. The hay/debris visible under the trailer in several photos (TC_06104, TC_06105, TC_06111, TC_06118) is cosmetic but worth noting for yard cleanliness. No signs of repeat failure, corrosion, or wiring damage were identified. Overall, this is a clean, well-documented repair with strong app-based verification — the LCM sensor performed correctly and the vendor resolved the issue appropriately.