Seat Belts, Inspecting
Seat Belts, Inspecting
=> [ Belt Webbing, Checking ]
=> [ Retractor Locking Function, Checking ]
=> [ Belt Latch, Inspection ]
=> [ Belt Latch Function, Checking ]
=> [ Belt Guide Rings and Locking Tongue, Checking ]
=> [ Securing Components and Anchorage Points, Checking ]
CAUTION!
After every accident the seat belt system must be inspected systematically! If damage is determined when inspecting the check points, customer must be informed regarding necessity of changing belts.
• If customer refuses to have a damaged seat belt replaced, appropriate note should be made in service book.
Belt Webbing, Checking
- Pull belt completely out of retractor or lap belt adjustment tongue.
- Check belt webbing for soiling, wash with mild soap solution if necessary. Refer to => operating instructions.
• If one of the types of damage (1 and 2) shown in the following is detected on a vehicle which has been in an accident - seat belt must be replaced completely with belt buckle.
• If damage as illustrated under points 1, 2 or 3 is determined on vehicle which has not been involved in an accident, it is sufficient to replace damaged belt only.
• 1 - Belt webbing cut, torn or chafed.
• 2 - Webbing loops on belt edge torn.
• 3 - Burn marks from cigarettes or similar.
Retractor Locking Function, Checking
The belt retractor has two locking functions.
• The first locking function is initiated by belt being jerked out of the retractor (belt extraction acceleration).
Checking
- Pull belt webbing out of retractor with a firm jerk.
• No locking effect - replace seat belt complete with belt buckle.
• If difficulties are experienced when pulling out or retracting belt, first check whether position of retractor has been altered.
• The second locking function is initiated by change in vehicle velocity (vehicle-dependent locking function).
Checking
- Fasten seat belt.
- Accelerate vehicle to 12 mph (20 km/h) and then perform a full braking maneuver with foot brake.
• Replace seat belt complete with seat belt latch if seat belt is not locked by locking mechanism during braking procedure.
CAUTION!
For safety reasons, road test should be carried out on traffic-free stretch to ensure that other motorists/pedestrians etc. are not endangered.
Belt Latch, Inspection
- Inspect belt buckle for cracks and fracturing.
• If damaged, replace seat belt complete with belt buckle.
Belt Latch Function, Checking
Checking belt buckle
- Slide the latch tongue into the belt latch until it clicks in place. Pull on the belt webbing strongly to make sure the latch mechanism is engaged.
• Replace seat belt complete with seat belt latch if belt tongue fails even only once to engage properly in seat belt latch during at least 5 tests.
Check release mechanism
- Press the button in the belt latch to release the seat belt. The latch tongue must spring out of the belt latch by itself when the belt webbing is slack.
• Perform the test at least five times. If the latch tongue does not spring out even one time, replace the entire seat belt, including the belt latch.
CAUTION!
Under no circumstances may grease be used to eliminate noise or stiffness at belt buckle buttons.
Belt Guide Rings and Locking Tongue, Checking
Plastic coated guide stops face load (seat belt on during accident) of the belt system parallel to the small grooves (chafing created by significant usage, in contrast, is recognizable in relation to the smooth, stripe-free abrasion).
- Check plastic for deformation, rupture and tearing.
• For groove build-up and/or damage, replace seat belt completely with lock.
Securing Components and Anchorage Points, Checking
• Latch bracket deformed (stretched)
• Height adjuster not functional
• Anchorage points (seat, pillar, vehicle floor) distorted or thread damaged
• If damage is found at components, replace the seat belt completely with lock.
• Replace anchorage points.
• In damage is discovered that is not accident-related, for example, wear, replace the particular part which is damaged.
Child Seat Anchorage Function, Checking
To check function, you must install entire belt system, including side trim.
Switching hold function on
• Pull belt webbing out completely up to stop.
Correct function
• Belt must retract with a chattering sound.
• If retracting process is stopped, belt cannot be pulled out anymore.
Deactivating
• Belt retraction to about 100 mm remaining
• The hold function must switch off when there is at least 100 mm remaining. The belt will function normally again.
Rear Three Point Seat Belt with Belt Tensioner, Checking Belt Fastening Detection
Special tools, testers and auxiliary items required
• Vehicle Diagnosis, Testing and Information System (VAS 5051B)
- Connect the (VAS 5051B) and select "15 - Airbag". Ignition must be switched on.
Display on (VAS 5051B):
- In selection - 1 -, tap diagnostic function "08 - Read measuring value block".
Display on (VAS 5051B):
- In button field - 2 -, enter "Display group number 004" and confirm this by tapping Q button.
• Seat belt is completely unrolled.
Display on (VAS 5051B):
• - 1 - Left belt = "no".
• - 2 - Right belt = "no".
• - 3 - Center belt = "no".
- Pull seat belt out to - L - dimension.
• Dimension - L - = approx. 550 mm
Display on (VAS 5051B):
• - 1 - Left belt = "yes".
• - 2 - Right belt = "yes".
• - 3 - Center belt = "yes".
- Pull the safety belt all the way out. When seat belt is pulled out completely, display must continue to show "yes".
- Unroll seat belt slowly, display must change from "yes" to "no" at a length of 450 mm, at the latest.
If seat belt reaches end position, display must stay on "no".