LCM Alert Validation

Confidence

Failure Category

Wiring

Subcategory

Smart7 - Wiring in Smart7

Sensor Verdict: The LCM sensor correctly identified a real defect on the Yellow (Left Turn) circuit with high confidence. The vendor's repair notes confirm at least two distinct root causes — a failed/grounded-out turn signal lamp and loose wiring with a poor ground inside the gateway nosebox. Both conditions would plausibly trigger a Yellow circuit alert, strongly validating the sensor's detection capability.

Photo Evidence: Seven photos were submitted. Photos 1, 4, and 7 show amber/orange Truck-Lite oval LED marker/turn signal lamps illuminated on what appear to be left-side positions on the trailer body — all lamps appear to be functioning and lit. Photo 2 shows a red rear stop/tail LED lamp (round, multi-LED cluster) illuminated, with an Oregon license plate partially visible, suggesting a rear lamp assembly check was also performed. Photos 3 and 5 are identical TechAssist app screenshots (Sensor Details for V505867, App v6.5.0) showing all five circuits — Red, Green, Yellow, Brown, and Black — marked as 'Verified.' Green and Yellow circuits show 'Defect/s resolved,' while Red and Brown show 'No defects.' This is strong documentation of post-repair verification. Photo 6 shows the open gateway nosebox with a complex multi-wire terminal board; wiring is dense and multi-colored with visible corrosion on several terminals and what appears to be aging insulation on some wires. This nosebox photo supports the vendor's claim of loose hardware and a poor ground inside the gateway. However, not all individual circuit lamps are individually photographed and identified by position (e.g., no dedicated photo of the specific replaced turn signal lamp pre-repair or with its position labeled), which is a minor documentation gap.

Vendor Compliance: The vendor largely followed the LCM troubleshooting procedure. The TechAssist app was clearly used, as evidenced by two screenshot submissions showing all five circuits verified. Photos of illuminated lamps were provided, though not exhaustively labeled by circuit position. A nosebox photo was included. The vendor's notes reference feedback categories consistent with the expected list: 'light failure' (grounded-out lamp replaced), 'loose wiring' (hardware tightened in nosebox), and 'wiring damage/corrosion' (implied by the nosebox condition photo). No PCT call reference number was noted, but the app-based verification satisfies the core procedural requirement. Overall compliance is good with minor documentation gaps.

Repair Summary: Two repair actions were performed: (1) a turn signal lamp was removed and replaced — identified as grounded out with power present, consistent with a shorted LED lamp; and (2) all hardware inside the gateway nosebox was tightened, including loose wiring and a ground connection. The Truck-Lite brand lamps visible in the photos are a recognized compliant OEM-grade brand for trailer lighting. The Yellow circuit was directly addressed, and the TechAssist app confirms 'Defect/s resolved' on both Green and Yellow circuits post-repair. The line items are listed as placeholder only, which is a documentation deficiency but does not negate the physical repairs evidenced.

Key Concerns: The primary concern is the placeholder line item — no specific part numbers, labor hours, or unit costs are documented, making cost validation impossible. Additionally, Labor Line 3 references a 'right turn signal not working,' while the alerting circuit is Yellow (Left/Road side) — this cross-reference to a right-side lamp is potentially confusing and may indicate the technician worked on both sides or mislabeled the position. The nosebox photo reveals significant wiring complexity and visible corrosion on terminals, which may warrant a follow-up inspection to assess long-term reliability. The duplicate TechAssist screenshots (Photos 3 and 5 are identical) suggest a minor submission redundancy but do not raise integrity concerns. Overall, this is a well-documented repair with strong sensor validation.