8.2 Seatbelts, Retractors, Buckles, Pretensioners & Anchorages

First decide what belt is required

Use VIRM Tables 7-5-1, 7-5-2, and 7-5-3 according to New Zealand first registration: before 1 January 1991, from that date through 31 March 2002, or from 1 April 2002. Then select the row for class and seating position. The belt-type key distinguishes lap (L), static lap-and-diagonal (S), single-sensitive ELR (R1), and dual/multiple-sensitive ELR (R2).

Do not assume that every older seating position needs a modern three-point belt, or that an originally fitted belt may be removed simply because an earlier minimum table would not have required it. The notes and replacement rules control.

Webbing, stitching, buckle, and stalk

Pull out the full webbing and inspect both sides. Reject cuts, fraying, broken or pulled threads, stretching or distorted weave, harmful contamination, heat/chemical damage, unauthorised repair or replacement, and other specified deterioration. Do not invent a numeric “percentage of edge cut” rule; apply the observed conditions on the page.

Inspect stitching for damage, alteration, or an activated rip-stitch system—including a broken stitch exposing a REPLACE BELT label or evidence that the label was removed. Buckle and tongue must latch, retain, and release as designed and be free of harmful damage or foreign-object access. The stalk must be secure, suitable for the position, and not badly damaged or positioned so the belt cannot be used.

An activated pretensioning system must be replaced. Evidence can include shortened/stiff components, deployed indicators, warning behaviour, or crash damage; use the VIRM and manufacturer evidence.

Retractors and performance

The webbing must pull out easily, retract without slow/intermittent action, and fully retract as intended. Test vehicle-sensitive and web-sensitive locking according to retractor type and seating position. Avoid unsafe impact tests or assumptions: use the VIRM method. A static belt must adjust and every belt must be long enough for a range of occupants and readily fastened/released.

Anchorages and corrosion

Anchorages must be secure and compatible with the belt and, for an integrated belt, with the seat. Reject corrosion or structural damage:

• within 150 mm of a lower seatbelt anchorage mounted in a wheel arch; or
• within 300 mm of any other seatbelt anchorage.

Check the load path, fasteners, reinforcement, floor/pillar condition, and unauthorised relocation.

Repairs and modifications

Re-webbed belts require evidence of NZTA exemption. Other repairs or replacement webbing/retractor work requires manufacturer approval as specified; claimed approval should be documented. Alternative belt types, extensions, harnesses, and post-1 January 1992 anchorage-affecting modifications may require LVV authority or certification. Verify that evidence covers the actual seat and use.

Inspection sequence

1. Identify class/date/position and required belt type.
2. Extend all webbing and examine both sides and stitching.
3. Test tongue, buckle, adjusters, retraction, and required locking sensitivities.
4. Inspect pretensioner condition and warning interaction.
5. Load anchorages reasonably and inspect the correct corrosion zone.
6. Check labels, approvals, exemptions, and modification evidence.
7. Record the seating position and exact defect.

Scenario

Corrosion lies 200 mm from a B-pillar upper anchorage. Although it is beyond 150 mm, it is within the 300 mm zone for an anchorage other than a lower wheel-arch anchorage, so it fails.

Retractor logic and replacement belts

A dual-sensitive retractor responds to both webbing acceleration and vehicle deceleration/tilt; a single-sensitive unit uses the applicable vehicle-sensitive mechanism. Test the sensitivities required for its position with the safe VIRM method. Pulling slowly until the belt reaches its end can engage some automatic locking modes and is not, by itself, proof of correct emergency locking.

Check identification and compatibility on replacement assemblies. A belt of a nominally “higher” type still must fit the anchorage, buckle, stalk and seating geometry correctly. A specialist harness is accepted only through the specified original-equipment, authority-card, or LVV route. Never accept a homemade extension, stitched repair, knotted webbing, or mismatched tongue/buckle because it appears to latch.

Crash-load reasoning

Test belts with the seat in normal positions and ensure the webbing path is not trapped by trim, a child-seat accessory or a folded seat. A buckle can latch yet fail because it releases under reasonable load, contains damage allowing foreign objects inside, or is mismatched. Follow the belt path to its anchorage; a sound belt attached to weakened structure is not compliant.

After testing, allow retractors to take up slack and leave belts accessible. Record whether a fault concerns mandatory equipment, condition, performance or modification, because the correct repair and recheck differ.