LCM Alert Validation

Confidence

Failure Category

Smart 7

Subcategory

damaged connector

Sensor Verdict: The LCM GREEN (Right Turn) circuit alert is confirmed as a true positive with high confidence (88%). The technician's diagnostic work corroborates the sensor's alert: the 7-way receptacle was found to be faulty, generating open circuit conditions that directly impacted the green circuit signal path. After replacing the 7-way, all circuits — including the alerting green circuit — returned to normal voltage (13.5V), and the unit was PCT-verified. The slight confidence deduction reflects the absence of a full photographic light-by-light verification walkthrough and the absence of a complete TechAssist app screenshot showing all five circuits verified green.

Photo Evidence: The photo evidence provided is moderately comprehensive but has notable gaps. Photos TC_05817, TC_05816, TC_05819, TC_05822, TC_05823, TC_05824, TC_05829, TC_05830, TC_05831, TC_05832 all document multimeter readings at the nosebox/front-of-trailer connection area, consistently showing 13.5V, which supports the technician's voltage findings post-repair. Photos TC_05827 and TC_05829 show the 7-way receptacle being inspected, with the cap open and pins visible — these are the most diagnostically relevant images and clearly show a standard 7-pin connector being examined. TC_05814 and TC_05818 show the junction/nosebox wiring, which appears intact and in reasonable condition though somewhat aged. TC_05825 (the Alpha MUT tester screen) shows a critical diagnostic readout: 'Tail/Tag 4mA Open Circuit,' directly validating the LCM alert and confirming an electrical fault existed at time of testing. TC_05839 and TC_05842 show amber marker/clearance lights illuminated on the trailer sides. TC_05841 and TC_05826 show the rear corner with red stop/tail lights visible. However, there are NO photos showing the GREEN circuit (right/curbside turn) lights individually illuminated in a step-by-step verification sequence. The PCT app screenshot (IMG_6194) shows circuits listed as 'Verified' but displays 'No data' for all circuits shown, which is an incomplete verification state. There is no full TechAssist completion screenshot confirming all five circuits with active data readings.

Vendor Compliance: Compliance with the LCM troubleshooting procedure is partial. The technician did use the Phillips Connect TechAssist/PCT app (IMG_6194 confirms sensor pairing and 'Maintenance Verified' status), and the Alpha MUT tester was employed extensively to measure voltages across circuits. The nosebox wiring was photographed (TC_05814). However, the procedure requires photos of EACH light illuminated individually, which were not fully provided — only a few lights are captured and not in a systematic per-circuit format. The TechAssist screenshot shows 'No data' for all circuits listed (Red, Green, Yellow, Brown), which does not constitute a fully compliant verification. The vendor notes reference 'unit PCT verified,' but the app screenshot does not show live circuit data confirming this. The failure category provided in the notes ('wear and tear') is vague and does not map precisely to the defined expected feedback categories, though 'damaged connector' is the appropriate classification.

Repair Summary: The primary repair performed was the removal and replacement of the 7-way receptacle (part number 16-726, $35.99), which is the correct intervention given the open circuit diagnostic findings tied to connector fault. Labor was billed at 0.5 hours for the R/R of the 7-way and an additional 0.5 hours for lot service labor, plus 0.1 hours for PCT sensor activation. The PCT sensor activation line item confirms the sensor was re-paired post-repair. The repair directly addressed the alerting GREEN circuit by resolving the faulty connector causing signal loss. The 7-way receptacle is a Phillips-compatible component and is an appropriate repair part. Shop supply fees and environmental charges are standard and acceptable.

Key Concerns: The primary concern is the TechAssist app screenshot (IMG_6194) showing 'No data' for all five circuits despite marking them as 'Verified' — this is inconsistent and may indicate the app verification was not fully completed with live trailer power connected, or data had not yet populated at time of screenshot. A compliant PCT verification should show actual current/voltage readings alongside the verified status. Additionally, the absence of a systematic light-by-light photo documentation (especially for the GREEN right-turn circuit lights) is a procedural gap. The notes mention the tail circuit had an open circuit reading but then normalized — it's worth noting that the LCM alert was for GREEN (right turn), not tail, yet the tail circuit is the one explicitly called out in the Alpha MUT screenshot; this slight circuit mismatch in documentation should be noted, though the 7-way replacement logically addresses all circuits simultaneously. No signs of repeat issues or mismatched parts are present, and the repair outcome appears sound.