NHTSA ID Number: 10143861
Manufacturer Communication Number: K23521227
TSB/Document Date: 2018-08-20
Summary
Seat Belt Alarm
Stays On After The Seat Belt Is Fastened - Model Year 2008 And Newer
Solution K23521227
Tuesday, August 7, 2018 4:59:29 PM CEST
VNR , VT , VNX , VNL , VNM , VHD , VAH
Engine family
Engine family
Emission Standard
Emission Standard
2018 , OBD2017 , US17 GHG , US14 CNG , US16 , US15 , US07 , US10 , US13
OBD , US14 GHG
** SOLUTION **
Title
Volvo Chassis - Seat Belt Alarm Stays On After The Seat Belt Is Fastened - Model Year
2008 And Newer
Cause
in the seatbelt electrical harness or internal to the seatbelt itself may result in the seatbelt
alarm remaining on after the seatbelt is buckled.
In normal operation, buckling the seat belt completes the alarm circuit and turns the
alarm off. A break in the wiring harness or bad connection internal to the buckle itself
may prevent the circuit from closing when the seatbelt is fastened.
An issue with this circuit will not affect the operation of the seatbelt.
Solution
If the seat belt alarm will not deactivate when the seat belt is buckled:
A. Check for continuity at the seatbelt connector
1. Buckle the seat belt.
2. With the belt fastened, check that the circuit through the seatbelt is complete.
- Resistance should not indicate an open line (OL) between power and ground
when the seat belt is buckled.
- If there is no continuity between power and ground at the connector with the belt
fastened, an issue exists in either the seat belt harness or within the buckle itself and will
need to be isolated and repaired. Refer to Section B.
- If there is continuity through the seat belt harness and buckle with the belt fastened
and a thorough wiggle test does not reveal an intermittent open line, the issue is more
likely located in the cab harness.
B. Check that the connector is positioned correctly and is not
corroded (Section A checks confirm poor or open connection in the harness,
connector, or buckle)
- The connector needs to be tied to the seat airline and remain above the floormat
as shown above.
• Positioning the connector below the floormat can lead to corrosion.
- Check that the wiring is clipped properly to the seatbelt bracket and is not
pinched.
• Double-headed cable ties should be used to prevent pinching and chafing against
the bracket.
C. If no fault is found in the connector and wiring after the checks in Section
B, the seatbelt needs to be replaced.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
seat belt , wiring harness
Function Group
Function Group
381 combined instrument , 884 seat belt and other restraining systems
Customer effect
Main customer effect
noise , fault code/display
Conditions
Vehicle operating mode
Frequency of occurrence of
problem
when driving , when stationary
random
Administration
Author
UT0538V
Dealer ID
UT0538V
Last modified by
A241298
Creation date
27-06-2018 21:06
Date of last update
31-07-2018 21:07
Status
Published
Average score
0
Number of scores
1
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TSB/Document ID: K23521227
Replacement Service Bulletin Number:
MFR Communication Date: 2018-07-31
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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