LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Recently Replaced Light

Sensor Verdict: The LCM issued a BLACK circuit alert (Clearance/License Plate) for trailer V562299 at site IGQ1. Based on the vendor's findings and photo evidence, the determination is 'No Defect Detected' with moderate confidence of 62%. The lower confidence reflects incomplete PCT app verification and a lack of definitive data confirming the sensor's original alert was a false positive versus a transient or intermittent fault that cleared prior to inspection.

Photo Evidence: The provided photos show a comprehensive walk-around of the trailer's lighting systems. Photos TC_05264.jpeg and TC_05272.jpeg show amber/orange side marker or clearance lights illuminated and functioning. TC_05265.jpeg and TC_05271.jpeg show red clearance/marker lights at the rear corners illuminated. TC_05266.jpeg shows rear tail/stop lights (both clusters) lit red with license plate TL6453 visible. TC_05267.jpeg shows the license plate (Idaho, TL6453) with a small license plate light illuminated below it. TC_05268.jpeg shows the underride guard center light lit red. TC_05269.jpeg shows both rear tail light clusters illuminated in red. TC_05270.jpeg shows the rear door area with small red indicator lights visible. TC_05273.jpeg and TC_05263.jpeg show front corner clearance lights on both sides of the nose, both appearing to be amber and lit. TC_05275.jpeg shows the nosebox/junction box open with wiring visible — wires appear connected and organized, though the image is somewhat complex with multiple wire colors and connections visible. Photos IMG_5526.png and IMG_5540.png are TechAssist app screenshots showing the LCM sensor details: the first (6:32 PM) shows all circuits as 'Not verified' and 'No data,' while the second (6:38 PM) shows all five circuits as 'Verified' but still displaying 'No data.' Notably, there is no photo specifically isolating and confirming a functioning license plate light independently, though TC_05267.jpeg partially addresses this. TC_05261.jpeg shows the trailer nose/VIN area identifying the unit as V562299 (A-ZNG visible).

Vendor Compliance: The vendor partially followed the LCM troubleshooting procedure. They did use the Phillips Connect TechAssist app, as evidenced by the two app screenshots provided. However, compliance is incomplete for several reasons: (1) The final TechAssist screenshot shows all circuits as 'Verified' but all circuits still read 'No data' rather than showing actual circuit readings or confirmed pass/fail measurements — this is unusual and suggests the verification may have been done without the trailer fully connected to a live tractor power source, or the app did not successfully capture live circuit data. (2) While photos of lights illuminated are present, they are not systematically organized to show each individual circuit position clearly, and the license plate light specifically (the alerting circuit) is only marginally documented. (3) The vendor's notes reference a general inspection and 12V confirmed at nosebox posts but do not specifically call out the BLACK circuit by name or provide targeted diagnostics for the license plate/clearance light circuit. The feedback category used ('no defect found') is appropriate, but the lack of live data in the PCT app undermines full confidence.

Repair Summary: No repairs were made on this work order. The vendor's assessment concluded that all lighting circuits were operational, all nosebox wiring nuts were secure, wiring was correct, and 12V was present on all posts. No parts were replaced, no line items were submitted, and no circuit was identified as defective. The work order reflects a diagnostic-only visit billed at 5 hours labor.

Key Concerns: Several concerns are worth flagging for this work order. First, the TechAssist app screenshots show 'No data' even on the final 'Verified' screenshot — this is a red flag indicating the app may not have successfully communicated with the sensor during active circuit testing, or the verification was performed incorrectly. A properly completed PCT verification should show actual circuit data readings, not just 'No data.' Second, the 5-hour diagnostic charge with no parts and no defect found is on the higher end for a no-fault-found inspection and warrants scrutiny. Third, the original BLACK circuit alert from the LCM sensor may represent an intermittent or transient fault (e.g., a loose connection that temporarily self-corrected, a brief power drop, or corrosion that wasn't visually apparent) — the nosebox photo does show a complex wiring arrangement that could benefit from closer inspection. Fourth, the license plate light documentation (TC_05267.jpeg) shows only a single small blue-white light glowing below the plate, which appears functional but is not conclusively verified as the correct lamp for the BLACK circuit. Overall, this WO lacks the definitive PCT confirmation data needed to fully close the alert as a clean no-fault-found.