DIAGNOSIS AND TESTING

Principles of Operation

For a detailed description of the Safety Belt System, refer to the relevant Description and Operation section in the workshop manual. REFER to: Seatbelt System (501-20A Seatbelt System, Description and Operation).

Safety Information

WARNINGS:

TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY, THE BACKUP POWER SUPPLY MUST BE DEPLETED BEFORE REPAIRING OR REPLACING ANY AIRBAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS) COMPONENTS. TO DEPLETE THE BACKUP POWER SUPPLY ENERGY, DISCONNECT THE BATTERY GROUND CABLE AND WAIT ONE MINUTE. FAILURE TO FOLLOW THIS INSTRUCTION MAY RESULT IN PERSONAL INJURY.
Do not use a multimeter to probe the restraints control module. It is possible for the power from the meter battery to trigger the activation of the airbags. Failure to follow this instruction may result in personal injury.

NOTES:

It is advisable not to use a mobile phone or to have a mobile phone in close proximity when working on the restraints control module or associated systems.
Given the legal implications of a restraints system failure, harness repairs to Airbag module circuits are not acceptable. Where the text refers to "REPAIR the circuit", this will normally mean the replacement of a harness.

Power Supply Depletion

Before beginning any work on the SRS system or related components:

Set the ignition to off

Disconnect the battery leads, ground first

Wait 2 minutes for the power circuit to discharge

There are comprehensive instructions on the correct procedures for SRS system repairs, refer to the relevant section of the workshop manual.

Inspection and Verification

CAUTION:

Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTES:

The ‘car sense system’ of the seatbelt is sensitive to both cornering and braking forces and is designed to lock when it detects this. It is therefore possible to lock when parking the vehicle on high kerbs and inclines. The seatbelt retractor will be locked when removed from the vehicle as it is not in the exact orientation that it was installed on the vehicle. This can be mistaken as a jammed seatbelt retractor.
If a control module or a component is at fault or may be at fault and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component.
When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places. For example, on the 2 volts range can measure 1mV or 2 K Ohm range can measure 1 Ohm. When testing resistance always take the resistance of the digital multimeter leads into account.
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Verify the customer concern

Visually inspect for obvious signs of damage and system integrity. Additionally inspect the seatbelt webbing and upper D-loop for signs of dirt/contamination

Visual Inspection

Mechanical	Electrical
Check for the installation of non-standard accessories which may affect or obstruct the function of the seatbelt system Frayed or damaged webbing Missing or damaged button stop Pretensioner buckles/stalks Webbing contamination	Fuses Wiring harnesses and connectors Restraints control module Pretensioner(s)

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step

If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index

Check JLR claims submission system for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and complete the recommendations as required

Symptom Chart for Seatbelt Rows 1, 2 and 3

Symptom	Possible Causes	Action
Seatbelt jammed - Webbing tight	Backlock effect-in action (webbing retracted quickly and came to sudden stop) Seatbelt retractor not installed correctly Rear centre seatbelt only. Mini-button (webbing travel limit stop) missing and seat cushion/backrest has been moved causing tight fit Automatic locking retractor activated (clicking, during retraction only)	CAUTION: Do not insert any objects or tools into the buckle head. NOTE: The ‘car sense system’ of the seatbelt is designed to lock when oriented at certain angles. When the seatbelt retractor is removed from the vehicle and not oriented at the exact angle that it is installed in the vehicle, on level ground, it will be locked. This can be mistaken as a jammed seatbelt retractor. GO to Pinpoint Test A. GO to Pinpoint Test F. GO to Pinpoint Test H. See the automatic locking retractor description below
Seatbelt jammed - Webbing loose	Seatbelt webbing trapped in seat Seatbelt retractor webbing guide loose Twist in webbing Interference in webbing routing D-loop not rotating correctly	GO to Pinpoint Test B. GO to Pinpoint Test C. GO to Pinpoint Test D. GO to Pinpoint Test E. GO to Pinpoint Test G.
Seatbelt jammed - Intermittent	Seatbelt retractor not installed correctly	CAUTION: Do not insert any objects or tools into the buckle head. NOTE: The ‘car sense system’ of the seatbelt is designed to lock when oriented at certain angles. When the seatbelt retractor is removed from the vehicle and not oriented at the exact angle that it is installed in the vehicle, on level ground, it will be locked. This can be mistaken as a jammed seatbelt retractor. GO to Pinpoint Test F.
Seat cushion/backrest will not fold/jammed	NOTE: Rear centre seatbelt only. Mini-button (webbing travel limit stop) missing and seat cushion/backrest has been moved causing excessive tension	GO to Pinpoint Test H.
Seatbelt retraction slow	Seatbelt retractor webbing guide loose Twist in seatbelt webbing Interference in webbing routing Seatbelt retractor not installed correctly D-loop not rotating correctly Foreign object/debris Seatbelt webbing dirty/contaminated	GO to Pinpoint Test C. GO to Pinpoint Test D. GO to Pinpoint Test E. GO to Pinpoint Test F. GO to Pinpoint Test G. GO to Pinpoint Test E. GO to Pinpoint Test J.
Seatbelt will not retract	Seatbelt retractor webbing guide loose Twist in seatbelt webbing D-loop not rotating correctly Interference in webbing routing Foreign object/debris	GO to Pinpoint Test C. GO to Pinpoint Test D. GO to Pinpoint Test G. GO to Pinpoint Test E. GO to Pinpoint Test E.
Seatbelt will not extract	Backlock effect-in action (webbing retracted quickly and came to sudden stop) Seatbelt retractor not installed correctly Seatbelt retractor webbing guide loose Twist in seatbelt webbing D-loop not rotating correctly Interference in webbing routing Foreign object/debris Automatic locking retractor activated (clicking – during retraction only)	CAUTION: Do not insert any objects or tools into the buckle head. NOTE: The ‘car sense system’ of the seatbelt is designed to lock when oriented at certain angles. When the seatbelt retractor is removed from the vehicle and not oriented at the exact angle that it is installed in the vehicle, on level ground, it will be locked. This can be mistaken as a jammed seatbelt retractor. GO to Pinpoint Test A. GO to Pinpoint Test F. GO to Pinpoint Test C. GO to Pinpoint Test D. GO to Pinpoint Test G. GO to Pinpoint Test E. GO to Pinpoint Test E. See the automatic locking retractor description below
Seatbelt noisy during operation	Automatic locking retractor activated (clicking–during retraction only) Interference in webbing routing (rubbing)	GO to Pinpoint Test B. GO to Pinpoint Test E.
Seatbelt buckle not latching / jammed	Foreign object/debris	CAUTION: Do not insert any objects or tools into the buckle head. GO to Pinpoint Test I.

Inertia Reel Seatbelts

The vehicle is equipped with (two row one), (three row two), and (two row three (seven seat versions only)) inertia reel seatbelts.

These seatbelts are dual sensitive, which means that they feature:

Car sense system - A vehicle motion sensor, which locks the seatbelt webbing under braking, cornering, on steep hills and in adverse camber conditions, when parked on a steep incline or driveway or with two wheels on a high pavement. When the seatbelt retractor is removed from the vehicle and not oriented at the exact angle that it is installed in the vehicle, on level ground, it will be locked. This can be mistaken as a jammed seatbelt retractor.
Web sense system - A webbing motion sensor, which locks when the seatbelt webbing is extracted suddenly

Seatbelt Locking Test

With the vehicle stationary and on level ground take firm hold of the seatbelt webbing (on the tongue side of the upper seatbelt anchor) and withdraw sharply, the retractor should lock. Preventing further webbing release (repeat this test 3 times). Any seatbelt retractor which fails to lock must not be used and a new seatbelt must be installed.

Automatic Locking Retractors

Some seatbelts feature an automatic locking retractor function. These can be used to secure a child seat or heavy load.

Vehicle	Seat Position	Market	Automatic Locking Retractor Installed	From Model Year
Freelander (L359)	Driver	All	No	2007
Freelander (L359)	Passenger	ROW	No	2007
Freelander (L359)	Passenger	US	Yes	2007
Freelander (L359)	Row 2	ROW	No	2007
Freelander (L359)	Row 2	US	Yes	2007
Discovery Sport (L550)	Driver	All	No	2015
Discovery Sport (L550)	Passenger	ROW	No	2015
Discovery Sport (L550)	Passenger	US	Yes	2015
Discovery Sport (L550)	Row 2	ROW	No	2015
Discovery Sport (L550)	Row 2	US	Yes	2015
Discovery Sport (L550)	Row 3	ROW	No	2015
Discovery Sport (L550)	Row 3	US	Yes	2015
Discovery 3/4 (L319)	Driver	All	No	2005
Discovery 3/4 (L319)	Passenger	ROW	No	2005
Discovery 3/4 (L319)	Passenger	US	Yes	2005
Discovery 3/4 (L319)	Row 2	All	Yes	2005
Discovery 3/4 (L319)	Row 3	All	Yes	2005
Defender (L316)	All	All	No	2007
Range Rover Evoque (L538)	Driver	All	No	2012
Range Rover Evoque (L538)	Passenger	ROW	No	2012
Range Rover Evoque (L538)	Passenger	US	Yes	2012
Range Rover Evoque (L538)	Row 2	ROW	No	2012
Range Rover Evoque (L538)	Row 2	US	Yes	2012
Range Rover (L322)	Driver	All	No	2002
Range Rover (L322)	Passenger	ROW	No	2002
Range Rover (L322)	Passenger	US	Yes	2002
Range Rover (L322)	Row 2	ROW	No	2002
Range Rover (L322)	Row 2	US	Yes	2002
Range Rover (L405)	Driver	All	No	2013
Range Rover (L405)	Passenger	ROW	No	2013
Range Rover (L405)	Passenger	US	Yes	2013
Range Rover (L405)	Row 2	ROW	No	2013
Range Rover (L405)	Row 2	US	Yes	2013
Range Rover (L405)	Row 3	All	No	2013
Range Rover Sport (L320)	Driver	All	No	2005
Range Rover Sport (L320)	Passenger	ROW	No	2005
Range Rover Sport (L320)	Passenger	US	Yes	2005
Range Rover Sport (L320)	Row 2	All	Yes	2006
Range Rover Sport (L494)	Driver	All	No	2014
Range Rover Sport (L494)	Passenger	ROW	No	2014
Range Rover Sport (L494)	Passenger	US	Yes	2014
Range Rover Sport (L494)	Row 2	ROW	No	2014
Range Rover Sport (L494)	Row 2	US	Yes	2014
Range Rover Sport (L494)	Row 3	ROW	No	2014
Range Rover Sport (L494)	Row 3	US	Yes	2014

Automatic Locking Retractor Activation and Deactivation

Activation	Deactivation
NOTE: When automatic locking retractor is activated, no further webbing can be drawn from the seatbelt retractor, prior to disengagement of the automatic locking. This can be mistaken as a jammed seatbelt retractor. Activated by total extraction of the webbing	Automatic locking retractor is deactivated by allowing the webbing to retract until the clicking stops (close to park position)
When activated the automatic locking retractor is identified by a clicking noise during webbing retraction	When deactivated the automatic locking retractor seatbelt changes state, from a static seatbelt to an automatic seatbelt

Diagnostic Guide Inertia Reel Seatbelts

PINPOINT TEST A : BACKLOCK
A1: BACKLOCK
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
CAUTION: Do not insert any objects or tools into the buckle head.
NOTE: The ‘car sense system’ of the seatbelt is designed to lock when oriented at certain angles. When the seatbelt retractor is removed from the vehicle and not oriented at the exact angle that it is installed in the vehicle, on level ground, it will be locked. This can be mistaken as a jammed seatbelt retractor.
	1 Visually inspect the condition of the seatbelt
	2 Draw a maximum of 20mm of the webbing from the seatbelt retractor with moderate force. Then release the webbing
	3 Check for correct operation twice
	Does the webbing move freely then retract correctly? Yes No further action required No For first row seatbelt GO to Pinpoint Test C. For second and third row seatbelts GO to Pinpoint Test B.

PINPOINT TEST B : WEBBING - TRAPPED IN SEAT
B1: WEBBING - TRAPPED IN SEAT
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Visually inspect the condition of the seatbelt
	2 Lift the seat base or release the seat backrest as required
	3 Free the trapped webbing, allow the webbing to retract Note: If the automatic locking retractor is activated, allow the webbing to retract until the clicking stops
	4 Check for correct operation twice
	Does the webbing move freely then retract correctly? Yes No further action required No GO to Pinpoint Test C.

PINPOINT TEST C : SEATBELT RETRACTOR - WEBBING GUIDE LOOSE
C1: SEATBELT RETRACTOR - WEBBING GUIDE LOOSE
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to 501-20 removal and installation section of the workshop manual, remove any trim panels required to expose the D loop (anchor point) and seatbelt retractor
	2 Check the webbing is not trapped or twisted and is centrally located on the seatbelt retractor spindle
	3 Attempt to withdraw the webbing from the seatbelt retractor NOTE: If the seatbelt webbing is jammed, the automatic locking retractor could be engaged
	4 To release the automatic locking retractor, manually wind the webbing onto the spindle until the automatic locking retractor deactivates (clicking stops)
	5 Fully extract webbing
	6 Confirm webbing guide location is correct , Confirm the fixing lugs are correctly located in the retractor frame
	7 Allow webbing to retract
	8 Check for correct operation twice
	Does the webbing move freely then retract correctly? Yes Refer to the 501-20 removal and installation section of the workshop manual, reinstall any trim panels, make sure there are no obstructions and the webbing does not catch or rub. No further action required No GO to Pinpoint Test D.

PINPOINT TEST D : TWIST IN WEBBING
D1: TWIST IN WEBBING
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to section 501-20 removal and installation section of the workshop manual, remove any trim panels required to expose the D loop (anchor point)
	2 Twist the webbing back the correct way in the loop
	3 Pass the twist through the pillar loop or escutcheon as required
	4 Check for correct operation twice
	Does the webbing move freely then retract correctly? Yes Refer to the 501-20 removal and installation section of the workshop manual, reinstall any trim panels, make sure there are no obstructions and the webbing does not catch or rub. No further action required No GO to Pinpoint Test E.

PINPOINT TEST E : INTERFERENCE - WEBBING ROUTING
E1: INTERFERENCE - WEBBING ROUTING
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to the 501-20 removal and installation section of the workshop manual, remove any trim panels required to expose the D loop (anchor point)
	2 Remove obstructions and foreign objects, make sure the webbing does not catch or rub
	3 Confirm the seatbelt does not contact the wiring harness
	4 Check for correct operation twice
	Does the webbing move freely then retract correctly? Yes Refer to the 501-20 removal and installation section of the workshop manual, reinstall any trim panels, make sure there are no obstructions and the webbing does not catch or rub. No further action required No GO to Pinpoint Test F.

PINPOINT TEST F : SEATBELT RETRACTOR - INCORRECT INSTALLATION
F1: SEATBELT RETRACTOR - INCORRECT INSTALLATION
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to the 501-20 removal and installation section of the workshop manual, remove any trim panels required to expose the D loop (anchor point) and the seatbelt retractor
	2 Refer to the 501-20 removal and installation section of the workshop manual, correctly reinstall the seatbelt retractor making sure that the locating "T bar" and "anti rotation pins" are correctly located
	3 Check for correct operation twice
	Does the webbing move freely then retract correctly? Yes Refer to the 501-20 removal and installation section of the workshop manual, reinstall any trim panels, make sure there are no obstructions and the webbing does not catch or rub. No further action required No Replace as required. Refer to the warranty policy and procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component

PINPOINT TEST G : D-LOOP NOT ROTATING CORRECTLY
G1: D-LOOP NOT ROTATING CORRECTLY
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to the 501-20 removal and installation section of the workshop manual, remove any trim panels required to expose the D loop (anchor point) and the seatbelt retractor
	2 Make sure there are no obstructions and the webbing does not catch or rub, the D loop (anchor point) rotates correctly and if installed the confirm the height adjuster operates correctly
	3 Check for correct operation twice
	Does the webbing move freely then retract correctly? Yes Refer to the 501-20 removal and installation section of the workshop manual, reinstall any trim panels, make sure there are no obstructions and the webbing does not catch or rub. No further action required No Replace as required. Refer to the warranty policy and procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component

PINPOINT TEST H : MINI BUTTON - MISSING/DAMAGED
H1: MINI BUTTON - MISSING/DAMAGED
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: This test applies to the rear centre seatbelt retractor installed in the seat back.
	1 Refer to the 501-20 removal and installation section of the workshop manual, remove the seat cushion and the plastic escutcheon at the top of the seat back (where the webbing exits to expose the lower anchor fixing point of the center seatbelt)
	2 Remove the lower anchorage of the seatbelt
	3 With the seat back correctly latched, allow up to 20mm webbing to retract, then extract the webbing
	Is the mini-button (webbing travel limit stop) correctly installed to the webbing and in good condition? Yes Feed the mini-button back through the plastic escutcheon if required. Correctly reinstall the escutcheon to the seat back, extract the webbing then allow to retract, make sure the mini-button comes to rest outside the escutcheon stop No Replace as required. Refer to the warranty policy and procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component

PINPOINT TEST I : SEATBELT BUCKLE - NOT LATCHING/JAMMED
I1: SEATBELT BUCKLE - NOT LATCHING/JAMMED
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
CAUTION: Do not insert any objects or tools into the buckle head.
	1 Visually inspect the buckle head for evidence of damage. If damaged replace as required
	2 Press the buckle release (red button) and (Using a torch) complete visual inspection for any evidence of debris/material or foreign objects in the buckle head
	3 If required remove the pretensioner from the vehicle. Remove the seat. Remove the pretensioner from the seat frame
	4 Do not insert any objects or tools buckle head With the buckle removed invert and attempt to shake out any debris
	5 Attempt to latch the tongue in the buckle
	Does the seatbelt buckle operate correctly Yes Reinstall any components, no further action required No Replace the pretensioner, Refer to section 501 20

PINPOINT TEST J : SEATBELT SLOW RETRACTION
J1: D-LOOP CONTAMINATION CHECK/CLEAN
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: Part shown removed for clarity. Seatbelt D-Loop can be visually inspected without removing the 'B' pillar trim panel.
	1 Visually inspect the front seatbelt D-Loop for a build up of dirt or contamination
	Does the front seatbelt D-Loop have a build up of dirt or contamination? Yes Clean the seatbelt webbing and seatbelt D-loop to remove any dirt or foreign material using warm water CAUTION: Do not use any detergents or allow the water to stain the interior trim or enter the seatbelt retractor system No Not the cause of the customers concern, continue diagnostics and follow the symptom chart for the reported failure

Published: 19-Sep-2019

2007.0 Range Rover Sport (LS), 501-20A

Seatbelt System (G1217620)