LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Failed Light

Sensor Verdict: The LCM alert on the YELLOW (Left Turn) circuit is assessed as a valid *Defect Detected* with 88% confidence. The technician's notes confirm that the Smart 7 nosebox circuit itself tested fine, but the midship left-side turn signal lamp was found to have only one functioning LED — a classic partial LED failure scenario that LCM sensors are specifically calibrated to detect through changes in circuit resistance or current draw. This strongly supports the sensor's alert as accurate and not a false positive. The minor reduction in confidence accounts for the absence of photographic evidence or TechAssist screenshots to independently corroborate the technician's findings.

Photo Evidence: No photos were attached to or referenced in this work order. The LCM troubleshooting procedure explicitly requires photos of each illuminated light in the circuit, a clear picture of the nosebox wiring, and a TechAssist app completion screenshot showing a green 'Verified' status beside each of the five circuits. None of these documentation requirements were met. This is a significant compliance gap and means the repair outcome cannot be visually verified by a reviewer. The absence of photos prevents independent confirmation of the defect, the replaced component, or the post-repair circuit status.

Vendor Compliance: The vendor (TA) partially followed the LCM troubleshooting procedure. Positively, the technician states they used the Phillips TechAssist app to verify all circuits post-repair, which aligns with the required procedure. However, the vendor failed to provide any photos (illuminated lights, nosebox, or TechAssist app screenshot), which are explicitly required steps. The failure category reported by the technician ('only had one LED') aligns with the defined subcategory of 'light partial failure (portion of LEDs failed),' which is appropriate. Overall, troubleshooting is marked non-compliant due to the complete absence of required photographic documentation and the missing TechAssist verification screenshot.

Repair Summary: The repair consisted of removing and replacing the midship left-side turn indicator and clearance lamp assembly. The replacement part used was an 'AUX TURN SIG/MARK LED P3' (qty 1, $113.99), categorized under marker lamps. Labor included 0.4 hours of standard service labor and 0.1 hours of Standard Service Labor B for the lamp R&R, plus 0.5 hours of lot service hourly labor. The alerting yellow (left turn) circuit was directly addressed, and the technician confirmed all other circuits and the Smart 7 nosebox were in good working order post-repair. Brand compliance is flagged as NO — the part description 'AUX TURN SIG/MARK LED P3' does not confirm a Phillips-approved or fleet-specified compliant lamp brand, and without photos or part number documentation, this cannot be verified.

Key Concerns: Several concerns warrant attention. First, an unrelated line item appears on this work order — a tire pressure monitoring speed sensor activation (AMAZON PCT SENSOR ACTIVATION) with associated labor — which has no connection to the LCM lighting alert and suggests possible line item padding or an unrelated repair being bundled into this work order. Second, the complete absence of photos and TechAssist screenshots is a significant vendor documentation failure that should be flagged for the vendor scorecard. Third, brand compliance on the replacement lamp cannot be confirmed. Finally, the work order notes contain a minor anomaly where the technician references 'YELLOW CIRCUT WAS FINE IN THE SMART 7' — meaning the nosebox insert was not the source of the fault — which is consistent with a lamp-level defect, but reviewers should confirm the Smart 7 LCM insert was not bypassed or tampered with, as this was not explicitly addressed in the notes.