Prevention FAQ — FMCSR 393.62D (Windshield Wipers)

Inspectors cite this violation when windshield wipers are completely inoperative or physically missing from the vehicle. Our inspection records show enforcement has occurred in Kentucky and Texas over the past 180 days, with a total of 2 citations across both states. The citation does not result in out-of-service placement in most cases—only 1 out of 11 all-time citations resulted in OOS. However, inspectors will verify that both driver-side and passenger-side wipers function at all speeds and that the windshield is clear of obstruction during operation. Any visible wear, streaking, or blade separation that impairs visibility may also be documented. Test the wipers yourself at the start of every shift: activate them in mist and full settings, observe blade contact and movement, and listen for unusual sounds indicating motor strain or linkage failure.

Build a checklist with these five elements: (1) Verify both driver and passenger wipers move smoothly without skipping or chattering; (2) Check blade rubber for cracks, peeling, or hardening—replace if older than 6 months or showing wear; (3) Inspect wiper arms for corrosion, bending, or loose fasteners; (4) Confirm the washer fluid reservoir is filled and nozzles spray evenly; (5) Test operation on both mist and full-speed settings with the engine running. Document the date, driver name, wiper condition (pass/fail), and any corrective action taken. This checklist should be completed before the vehicle leaves the yard. Photograph blade condition quarterly as part of your fleet maintenance records. Drivers should report any wiper degradation immediately—do not wait for the next scheduled maintenance interval.

Drivers must carry the vehicle's maintenance log showing all wiper replacements and repairs with dates and mileage. Carriers should retain: (1) copies of pre-trip inspection checklists signed by the driver, (2) work orders and receipts for blade and motor replacement, including parts numbers and technician name, (3) photographs of blade condition from the last three inspections, and (4) any technician notes on wiper motor electrical issues. Keep records for at least 12 months. If a citation is issued, photograph the actual condition of the wipers cited and retain the inspection report. These documents support a DataQs challenge if the citation was issued in error or if maintenance records prove the wipers were functional at the time of inspection.

Across our inspection records, wiper citations are occasionally paired with other vehicle defects indicating maintenance program gaps. Our data shows 1 co-occurrence of code 393.203E (cab front bumper missing/unsecured) in the same inspection as a wiper citation, suggesting that when a fleet has neglected exterior hardware, wiper maintenance may also be overlooked. Peer codes in the vehicle maintenance category—such as 393.9(a) (inoperable lamps) with 660,737 citations and 396.3(a)(1) (general inspection/repair/maintenance) with 236,919 citations—indicate the root causes are typically: (1) deferred or skipped pre-trip checks, (2) lack of routine blade replacement schedules, (3) electrical supply issues (corroded battery terminals, loose wiring), and (4) driver training gaps on when to request repairs. Establish a 6-month blade replacement cycle and tie it to fuel or oil-change intervals to ensure consistency.

After repair, follow a three-step verification process. First, have the technician perform a full operational test on both speed settings with the engine running and the windshield wetted. The blades must make full contact without streaking or jumping. Second, physically inspect the blade rubber for cracks or peeling and confirm the motor spins smoothly without grinding sounds. Third, have an independent driver (not the technician) perform a 10-minute test drive on wet pavement or use the washer function repeatedly to confirm visibility is unobstructed. Document the test outcome, date, technician name, and parts used (motor, arms, blades). Retain photos of the repaired assembly. Only release the vehicle to service once this verification is complete. Do not rely on the driver's report alone; make the inspection mandatory before the vehicle re-enters the fleet rotation.

Within 48 hours of a citation, hold a review meeting with the driver, your safety manager, and the maintenance lead. Examine the roadside inspection report to confirm the exact condition cited. Have the driver walk through their pre-trip routine—identify whether they checked the wipers that morning and what they observed. Review the maintenance log for the vehicle: when were the blades last replaced, and who performed the work? Determine whether the failure was: (1) a sudden mechanical issue the driver could not have predicted, (2) a missed pre-trip check, or (3) deferred maintenance the driver reported but the shop did not address. If the driver failed to check, provide remedial training on the pre-trip process. If the shop deferred work, clarify the shop's backlog and add wiper replacements to the priority queue. Document the root cause and corrective action, and track whether that specific vehicle or similar-vintage units require increased inspection frequency.

The FMCSR 393.62D violation carries a CSA severity weight of 4, and our inspection records show it ranks #2167 out of 3,036 total FMCSR codes by citation volume. While this code is enforced at a low absolute rate—only 11 all-time citations in our database—it contributes to the Vehicle Maintenance BASIC when recorded. The out-of-service rate for this code is 9.1%, which is significantly below the all-FMCSR average of 31.4%, meaning inspectors rarely remove vehicles from service for this violation alone. However, the violation still appears in CSA scores and can accumulate if your fleet receives multiple citations. Combined with more frequently cited maintenance violations like 393.9 (inoperable lamps, 660,737 citations) or 396.3(a)(1) (general maintenance, 236,919 citations), wiper citations may signal broader inspection frequency or technician training gaps that warrant your attention.

Develop a two-part training module. Part 1: Pre-trip wiper inspection—teach drivers to physically move the wiper arms by hand before engine start, verify blade contact and flexibility, check for visible cracks or separation, and test operation at mist and high speeds with the engine running. Emphasize that wipers are a safety requirement, not optional, and must be reported immediately if they fail during operation. Part 2: When to escalate—drivers should know the shop backlog for maintenance requests and have a direct contact for urgent repairs. Many of our top vehicle makes in the citation data (Peterbilt, Kenworth, Mack, Volvo, Freightliner) have different wiper linkage designs; consider model-specific training if your fleet operates mixed equipment. Conduct in-person training at hire and annually refresh it. Use dashcam footage or photos of worn blades to show real-world examples of failure conditions.

File a DataQs challenge if: (1) maintenance records and photographs prove the wipers were replaced and tested within 30 days of the inspection date, (2) the driver's signed pre-trip checklist from that day shows a pass, (3) the inspector did not document the specific defect (e.g., 'blade separated' vs. generic 'inoperative'), or (4) the vehicle was in the shop for wiper repair on the citation date and should not have been in operation. Gather your documentation package: maintenance work order, receipt, driver checklist, and photos. If the inspector's notes are vague or the citation timeline conflicts with your maintenance records, challenge it. Our data shows only 1 out of 11 all-time citations resulted in out-of-service placement, indicating that most citations are discretionary—a well-documented challenge has a reasonable chance of success, particularly if your fleet's maintenance records demonstrate compliance at the time of inspection.

Conduct a formal wiper audit every 90 days. Our inspection records show 1 citation in the last 90 days and 7 citations in the last 12 months, indicating sporadic but consistent enforcement. A quarterly audit ensures no vehicle falls through routine maintenance schedules. In the 90-day window, examine every unit in your fleet: verify blade age (replace at 6 months regardless of condition), photograph contact area and motor, and test operation. For vehicles flagged in the quarterly audit, schedule blade replacement before the next 90-day cycle. Additionally, conduct a brief spot check (10% sample) each month, focusing on vehicles with the highest mileage or longest time since last blade replacement. Use the audit data to predict when fleet-wide blade replacements will be needed and bulk-order supplies during low-season downtime. This proactive approach will prevent surprise citations and reduce the cumulative effect on your Vehicle Maintenance BASIC score.