Prevention FAQ — FMCSR 393.62B: Windshield Wipers

Inspectors verify that both wipers are physically present and function across the full windshield width. They activate the wipers manually or via the vehicle's control to confirm smooth operation and proper contact with glass. Our inspection records show 4 citations all-time for inoperative or missing wipers, with Texas accounting for 2 of those in the last 180 days. The citation is binary: either the wipers work or they don't. Common fail points include frozen pivot joints in cold weather, torn rubber blades, motor failure, and missing passenger-side wipers. Because 75% of citations result in out-of-service placement—well above the 31.4% all-FMCSR average—inspectors treat this as a safety-critical issue affecting visibility during adverse conditions.

Your pre-trip must require drivers to: (1) visually inspect both blades for cracks, splits, or separation from the frame; (2) verify rubber edges contact the windshield across the full width; (3) test operation at both low and high speeds; (4) check that spray washer fluid activates and reaches the windshield; (5) confirm both wipers return to rest position; (6) document the check on the vehicle inspection report (DVIR). Make this non-negotiable—failed wipers must be logged immediately and the vehicle removed from service until repaired. Across our database, the lack of a documented pre-trip protocol is a leading root cause. Include seasonal reminders: in winter, drivers must clear ice buildup before operation, and in summer, inspect for UV-degraded rubber.

Drivers must complete a pre-trip DVIR with a specific line item for windshield wipers (pass/fail/repair needed) and sign it daily. Carriers should retain DVIRs for at least 12 months and cross-reference them with work orders for any wiper repairs. When repairs are made, the work order must include: date, vehicle unit number, parts replaced (blades, motor, linkage), technician name, and completion sign-off. Photograph both blades before and after replacement to close the loop. If a citation is issued, preserve the DVIR from that date—it demonstrates whether the driver identified the defect before being cited, which supports a DataQs challenge if the citation contradicts documented pre-trip activity.

Our database shows windshield wiper citations frequently pair with broader vehicle maintenance lapses. The most impactful peer code is 396.3(a)(1)—Inspection/repair/maintenance general—which appears in 45.3% of its cases out-of-service. This pattern suggests that carriers issuing wiper citations often have systemic maintenance backlogs; wipers are typically the symptom, not the isolated issue. A secondary pattern involves 393.9(a)—Inoperable required lamps—flagging fleets with weak pre-trip culture overall. The third indicator is 393.78—Windshield condition defective—showing that when wipers fail, the windshield may also be compromised (cracks, dirt, fogging), compounding visibility risk. Audit your maintenance queue and pre-trip enforcement: if one driver gets a wiper citation, audit five more units at that terminal immediately.

After repair, a supervisor or trained technician must conduct a functional test and sign the work order. Test both wipers at low and high speeds across the full windshield arc. Verify the motor draws current smoothly without grinding or chattering. Confirm washer spray activates and fluid reaches glass. Check that wipers park correctly at rest. Document the test result and completion time on the work order. For blade replacements, retain the old blades with the work order photo for 30 days—this proves the defect was corrected. Do not rely on the repair shop's completion alone; have your own staff sign off. This dual-signature approach prevents the vehicle from returning to service with incomplete repairs, which is a common source of repeat citations.

Within 48 hours of a citation, pull the driver's DVIR from the citation date and interview the driver: Did they report the wiper defect pre-trip? If yes, why wasn't the vehicle pulled immediately? If no, why didn't they catch it? Review the vehicle's maintenance history for the 90 days prior—were blade replacements overdue? Inspect the cited unit again yourself and document condition. Check all 5–10 similar units at that terminal for the same defect (e.g., if STAR make vehicles are cited, inspect other STARs). Assign root cause: driver behavior gap, maintenance delay, design flaw, or training lapse. Most critically, determine whether to challenge the citation via DataQs: if your DVIR from that morning shows pre-trip notation of the defect, you have evidence supporting a challenge.

Windshield wipers carry a CSA severity weight of 4 on the Vehicle Maintenance BASIC. While 4 is moderate (not the highest weight), this code ranks #2480 of 3,036 FMCSR codes by citation volume, making it statistically rare. However, the 75% out-of-service rate means that when cited, the impact is disproportionately severe—the vehicle is pulled from service three-quarters of the time. Your BASIC score aggregates all maintenance violations; one wiper citation contributes 4 points to your Safety Event Aggregate. In a fleet with low violation frequency, this single event is notable. More important: the OOS placement signals to CVSA auditors that your pre-trip and maintenance protocols may need strengthening. Focus on preventing the citation rather than managing the aftermath.

Conduct quarterly classroom or online training covering: (1) Visibility and safety: explain how inoperative wipers directly increase accident risk in rain, snow, and sleet; (2) Pre-trip discipline: walk drivers through the exact wiper test steps and DVIR documentation; (3) Blade lifespan: teach that standard blades last 6–12 months depending on climate and use, and summer/winter transitions require inspection; (4) Cold-weather protocol: in freezing climates, drivers must thaw wipers before operation and check for ice buildup; (5) Immediate reporting: emphasize that wipers discovered defective during a trip must be reported at the next stop, not left until the next pre-trip. Since STAR vehicles represent 2 of 4 citations in our database, if your fleet operates STARs, include STAR-specific wiper system diagrams in training to familiarize drivers with that platform's controls and common failure modes.

File a DataQs challenge if: (1) your pre-trip DVIR from the citation date documents that the driver found and reported the wiper defect, proving the wipers were functional at pre-trip but failed in-transit; (2) a work order shows the vehicle was in the shop for wiper repair within 24 hours prior to the citation, suggesting the inspector tested a vehicle under repair; (3) the inspector's roadside test was conducted in extreme cold (freezing wipers to the windshield) or other unusual condition that rendered a fair test impossible; (4) you have photographic evidence (work order photos or fleet camera footage) proving wipers were functional at the time alleged. Do not challenge based on opinion. Use only documentary evidence from your own records.

Conduct monthly wiper audits across 10–15% of your fleet (rotate units so all are covered over 9–10 months). Our records show 0 citations in the last 90 days but 4 all-time, indicating sporadic enforcement; however, this absence of recent citations should not breed complacency—it means your pre-trip and maintenance programs are working. Treat monthly audits as preventive: test both wipers on each audited unit, photograph findings, and log results. If any unit fails, issue a repair work order immediately and retest within 48 hours. Supplement with a full-fleet spot-check every six months (all units in one week) to catch systematic issues such as deferred maintenance or expired blade inventory. This cadence is justified by the low enforcement volume but high OOS rate: you need internal visibility before an inspector finds the defect.