LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

light failure

Sensor Verdict: The LCM alert on the GREEN (Right Turn) circuit for trailer V507868 is assessed as a legitimate defect detection with 92% confidence. The technician's findings — multiple inoperative marker/clearance lights at the rear lower corner and top rear positions — are directly consistent with the type of fault that would trigger a GREEN circuit alert. The repair verified all circuits through the PCT TechAssist app, and the final job summary screenshot (IMG_2302.png) confirms 'Light Circuit✓' as a verified sensor with defects resolved. The slight confidence deduction reflects that the faulted circuit was labeled GREEN (Right Turn), while some repairs involved red rear marker/clearance lights, which could overlap with other circuits; however, the overall evidence strongly supports a genuine defect.

Photo Evidence: The photo documentation is reasonably thorough but not fully comprehensive. Photos TC_08241 and TC_08242 show the nosebox and gateway label clearly, confirming the correct unit (IMEI: 864395062566590, MAC: CB:62:0D:F2:8A:36). TC_08256 and TC_08253 show the rear lower corner red marker lights illuminated and functioning after repair, indicating successful replacement. TC_08257 shows the top rear marker lights illuminated (red) following repair, and TC_08247 shows the rear door latch/hinge area with those same lights visible. TC_08244 and TC_08254 document amber side marker lights functioning. TC_08252 confirms the license plate light is on. TC_08255 and TC_08243 show the front corner amber clearance lights functioning. TC_08238 shows the trailer ID (V507868). IMG_2285 shows the initial gateway details with ATIS Lamp sensor 'Not Connected/Unverified,' suggesting an additional anomaly, and IMG_2301 shows all five light circuits verified (Red, Green, Yellow, Brown, Black — all showing 'Verified'). IMG_2302 confirms the completed job summary with Light Circuit verified. However, there are no 'before' photos clearly documenting the inoperative lights, and not every individual light in the GREEN circuit is independently photographed in an illuminated state.

Vendor Compliance: The vendor (TA) demonstrated good overall compliance with the LCM troubleshooting procedure. The PCT TechAssist app was used throughout the process, as evidenced by screenshots showing gateway details (IMG_2285), individual circuit sensor verification (IMG_2301), and the final job summary (IMG_2302). All five circuits are marked 'Verified' in the app, and the Brown and Black circuits show 'Defects resolved,' which is consistent with the repairs made. The technician's notes are reasonably detailed, describing specific light positions found inoperative (rear lower corner and top rear 3 marker lights), the repair action taken, and a final light check confirming all functions working. The nosebox is photographed (TC_08241), though it appears to show a heavily wired, somewhat congested junction box. One area of partial non-compliance is the absence of clear 'before' photos of the failed lights and the fact that the ATIS Lamp sensor remained 'Not Connected/Unverified' per the initial app screenshot without clear resolution documentation.

Repair Summary: The technician replaced 4 mini LED red marker lights (part 33250R), 4 light pigtails, and used 8 butt splice connectors (Seal-A-Crimp 22-18 gauge) to complete the wiring repairs. Labor included 1.6 hours of standard service labor for the lamp assemblies, 1.0 hour for pigtail replacement, and 0.5 hours of lot service hourly labor. The repairs addressed both the rear lower corner marker lights and the top rear marker lights, which are the positions confirmed by the post-repair photos showing all lights illuminated. The PCT app final verification screen confirms Light Circuit sensor is verified with defects resolved. The LED lamp type used (33250R mini LED marker red) is an appropriate replacement for trailer marker applications.

Key Concerns: Several items warrant attention. First, the ATIS Lamp sensor shown as 'Not Connected/Unverified' in the initial gateway screenshot (IMG_2285) is not clearly addressed in the technician's notes or follow-up documentation — this could indicate an additional unresolved sensor issue or a pre-existing condition. Second, the faulted circuit was logged as GREEN (Right Turn), yet the primary repairs involved red rear marker/clearance lights; while these can share the same circuit wiring harness, the circuit color mismatch should be noted for audit purposes. Third, the technician's notes contain grammatical inconsistencies ('BEOSNIET') suggesting possible transcription or voice-to-text errors, which reduces note clarity. Fourth, a spare black rubber mat/pad is visible on the ground in several rear photos (TC_08248 through TC_08251) — this appears unrelated to the repair but is worth noting. Overall, the work appears to have been performed correctly and completely, with no major red flags regarding the core lighting repair.