Lincoln Navigator Manuals

Lincoln Navigator: Seatbelt Systems / Seatbelt Systems. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Body and Paint / Seatbelt Systems / Seatbelt Systems. Diagnosis and Testing

Global Customer Symptom Code (GCSC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


Symptom Action
Driver Aid & Information > Warning Indicators/Messages/Chimes > Safety Belt > Inoperative GO to Pinpoint Test D
Driver Aid & Information > Warning Indicators/Messages/Chimes > Safety Belt > Stays On GO to Pinpoint Test D
Safe & Secure > Seat Belt > Front Driver > Appearance GO to Pinpoint Test C
Safe & Secure > Seat Belt > Front Driver > Comfort GO to Pinpoint Test B
Safe & Secure > Seat Belt > Front Driver > Comfort GO to Pinpoint Test C
Safe & Secure > Seat Belt > Front Driver > Difficult to Close GO to Pinpoint Test A
Safe & Secure > Seat Belt > Front Driver > Difficult to Open GO to Pinpoint Test A
Safe & Secure > Seat Belt > Front Driver > Retraction GO to Pinpoint Test B
Safe & Secure > Seat Belt > Front Driver > Retraction GO to Pinpoint Test C
Safe & Secure > Seat Belt > Front Driver > Sticks/Binds GO to Pinpoint Test A
Safe & Secure > Seat Belt > Front Driver > Sticks/Binds GO to Pinpoint Test B
Safe & Secure > Seat Belt > Front Driver > Sticks/Binds GO to Pinpoint Test C
Safe & Secure > Seat Belt > Front Passenger > Appearance GO to Pinpoint Test C
Safe & Secure > Seat Belt > Front Passenger > Comfort GO to Pinpoint Test B
Safe & Secure > Seat Belt > Front Passenger > Comfort GO to Pinpoint Test C
Safe & Secure > Seat Belt > Front Passenger > Difficult to Close GO to Pinpoint Test A
Safe & Secure > Seat Belt > Front Passenger > Difficult to Open GO to Pinpoint Test A
Safe & Secure > Seat Belt > Front Passenger > Retraction GO to Pinpoint Test B
Safe & Secure > Seat Belt > Front Passenger > Retraction GO to Pinpoint Test C
Safe & Secure > Seat Belt > Front Passenger > Sticks/Binds GO to Pinpoint Test A
Safe & Secure > Seat Belt > Front Passenger > Sticks/Binds GO to Pinpoint Test B
Safe & Secure > Seat Belt > Front Passenger > Sticks/Binds GO to Pinpoint Test C
Safe & Secure > Seat Belt > 2nd Row / Rear > Appearance GO to Pinpoint Test C
Safe & Secure > Seat Belt > 2nd Row / Rear > Comfort GO to Pinpoint Test B
Safe & Secure > Seat Belt > 2nd Row / Rear > Comfort GO to Pinpoint Test C
Safe & Secure > Seat Belt > 2nd Row / Rear > Difficult to Close GO to Pinpoint Test A
Safe & Secure > Seat Belt > 2nd Row / Rear > Difficult to Open GO to Pinpoint Test A
Safe & Secure > Seat Belt > 2nd Row / Rear > Retraction GO to Pinpoint Test B
Safe & Secure > Seat Belt > 2nd Row / Rear > Retraction GO to Pinpoint Test C
Safe & Secure > Seat Belt > 2nd Row / Rear > Sticks/Binds GO to Pinpoint Test A
Safe & Secure > Seat Belt > 2nd Row / Rear > Sticks/Binds GO to Pinpoint Test B
Safe & Secure > Seat Belt > 2nd Row / Rear > Sticks/Binds GO to Pinpoint Test C

Symptom Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


  Symptom Chart


Condition Actions
The seatbelt buckle and tongue does not latch securely   GO to Pinpoint Test A
The seatbelt retractor webbing does not extract or exhibits excessive pressure on the occupant during use   GO to Pinpoint Test B
The seatbelt retractor webbing does not retract or has excessive slack during use   GO to Pinpoint Test B
The seatbelt tongue is rotated on the seatbelt webbing   GO to Pinpoint Test C
The seatbelt webbing is twisted at the seatbelt guide   GO to Pinpoint Test C
The seatbelt webbing is dirty or soiled   GO to Pinpoint Test C
The rear seatbelt RTT warning indicator is never or always displayed   GO to Pinpoint Test D

Pinpoint Tests


PINPOINT TEST A: THE SEATBELT BUCKLE AND TONGUE DOES NOT LATCH CORRECTLY

Normal Operation and Fault Conditions

REFER to: Seatbelt System Functional Tests (501-20A Seatbelt Systems, General Procedures).

Possible Sources

  • Seatbelt buckle
  • Seatbelt tongue (part of seatbelt retractor or seatbelt)
  • Foreign debris
A1 CHECK THE SEATBELT BUCKLE AND TONGUE LATCHING AND RELEASE
  • Check the affected seatbelt buckle and tongue for latching and release. Carry out the Seatbelt Buckle and Tongue Functional Test.
    REFER to: Seatbelt System Functional Tests (501-20A Seatbelt Systems, General Procedures).

Did the seatbelt buckle and tongue pass the functional test?
Yes If the concern can't be duplicated, the seatbelt system is working correctly. Return the vehicle to the customer.
No INSTALL new parts as directed by the Seatbelt Buckle and Tongue Functional Test. RECHECK the system.

PINPOINT TEST B: SEATBELT RETRACTOR EXTRACTION/RETRACTION CONCERNS

Normal Operation and Fault Conditions

REFER to: Seatbelt Systems - System Operation and Component Description (501-20A Seatbelt Systems, Description and Operation).

Possible Sources

  • Interior trim, wiring harness or insulation is not installed correctly
  • Twisted or incorrectly routed seatbelt webbing
  • Seatbelt retractor is in web sensing mode
  • Seatbelt retractor is in Automatic Locking Retractor (ALR) mode (if equipped)
  • Seatbelt retractor binding internally

Visual Inspection and Pre-checks

  • Seatbelt webbing integrity (torn, frayed, cut or stretched)
  • D-ring (if equipped) moves freely and is free of dirt and debris
B1 CHECK THE SEATBELT RETRACTOR
  • NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode. Extract the seatbelt webbing from the seatbelt retractor.

Does the seatbelt operate without excessive effort or binding?
Yes If the seatbelt webbing will not retract, for an outboard mounted seatbelt retractor, GO to B4 For an inboard mounted seatbelt retractor, GO to B5
No If the interior trim, wiring harness or insulation are not installed correctly, correct the installation. REFER to section 501-05 and the appropriate procedure.
If the seatbelt webbing is twisted, correct the installation.
REFER to: Seatbelt Twisted at the Seatbelt Guide (501-20A Seatbelt Systems, General Procedures). If the seat is not assembled correctly, correct the installation. REFER to section 501-05, section 501-10A, section 501-10B, section 501-10C or section 501-20A and the appropriate procedure.
If the seatbelt webbing is incorrectly routed, correct the installation. REFER to section 501-05 or section 501-20A and the appropriate procedure.
If the concern was confirmed, CORRECT the concern. If not, GO to B2

B2 CHECK THE SEATBELT RETRACTOR EXTRACTION
  • Allow the seatbelt webbing to retract back onto the seatbelt retractor spool.
  • NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode. Extract the seatbelt webbing from the seatbelt retractor.

Does the seatbelt retractor allow extraction of the seatbelt?
Yes Attempt to duplicate the customer's concern. Carry out the Seatbelt Retractor Functional Test and the Seatbelt Retractor, Automatic Locking Retractor (ALR) Mode Functional Test.
REFER to: Seatbelt System Functional Tests (501-20A Seatbelt Systems, General Procedures). If the concern was confirmed, CORRECT the concern. If not, GO to B3
No If the seatbelt retractor is in web sensing mode, unlock the locked seatbelt retractor.
REFER to: Locked Seatbelt Retractor Releasing (501-20A Seatbelt Systems, General Procedures). If the concern was confirmed, CORRECT the concern. If not, GO to B3

B3 CHECK THE SEATBELT RETRACTOR EXTRACTION
  • Allow the seatbelt webbing to retract back onto the seatbelt retractor spool.
  • NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode. Extract the seatbelt webbing from the seatbelt retractor.

Does the seatbelt retractor allow extraction of the seatbelt?
Yes If the concern can't be duplicated, the seatbelt system is working correctly. Return the vehicle to the customer.
No If the seatbelt retractor is locked in Automatic Locking Retractor (ALR) mode, carry out the Automatic Locking Retractor (ALR) Mode Functional Test.
REFER to: Seatbelt System Functional Tests (501-20A Seatbelt Systems, General Procedures).

B4 CHECK THE OUTBOARD SEATBELT RETRACTOR RETRACTION
  • For an outboard seatbelt retractor, carry out the following:
    1. Allow the seatbelt webbing to retract back onto the seatbelt retractor spool.

    2. NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode.

      Extract the seatbelt webbing from the affected seatbelt retractor.
    3. Allow the seatbelt webbing to retract back onto the seatbelt retractor spool noting the amount of time it takes to retract the seatbelt webbing.

    4. NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode.

      Extract the seatbelt webbing from the non-affected seatbelt retractor on the opposite side and compare the speed at which the seatbelt webbing is retracted.

Do the 2 seatbelt retractors retract the seatbelt webbing at approximately the same time?
Yes Attempt to duplicate the customer's concern. Carry out the Seatbelt Retractor Functional Test and the Seatbelt Retractor, Automatic Locking Retractor (ALR) Mode Functional Test.
REFER to: Seatbelt System Functional Tests (501-20A Seatbelt Systems, General Procedures).
No Make sure the D-ring (if equipped) moves freely and is free of dirt and debris.
If the interior trim, wiring harness or insulation are not installed correctly, correct the installation. REFER to section 501-05 and the appropriate procedure.
If the seatbelt webbing is twisted, correct the installation.
REFER to: Seatbelt Twisted at the Seatbelt Guide (501-20A Seatbelt Systems, General Procedures). If the seatbelt webbing is incorrectly routed, correct the installation. REFER to section 501-05 or section 501-20A and the appropriate procedure.
If the concern was confirmed, CORRECT the concern. If not, GO to B6

B5 CHECK THE INBOARD SEATBELT RETRACTOR RETRACTION
  • For an inboard seatbelt retractor, carry out the following:
    1. Allow the seatbelt webbing to retract back onto the seatbelt retractor spool.

    2. NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode.

      Extract the seatbelt webbing from the affected seatbelt retractor.
    3. Allow the seatbelt webbing to retract back onto the seatbelt retractor spool noting the amount of time it takes to retract the seatbelt webbing.

    4. NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode.

      On a similar vehicle, extract the seatbelt webbing from a non-affected seatbelt retractor at the same position and compare the speed at which the seatbelt webbing is retracted.

Do the 2 seatbelt retractors retract the seatbelt webbing at approximately the same time?
Yes Attempt to duplicate the customer's concern. Carry out the Seatbelt Retractor Functional Test and the Seatbelt Retractor, Automatic Locking Retractor (ALR) Mode Functional Test.
REFER to: Seatbelt System Functional Tests (501-20A Seatbelt Systems, General Procedures).
No Make sure the D-ring (if equipped) moves freely and is free of dirt and debris.
If the interior trim, wiring harness or insulation are not installed correctly, correct the installation. REFER to section 501-05 and the appropriate procedure.
If the seatbelt webbing is twisted, correct the installation.
REFER to: Seatbelt Twisted at the Seatbelt Guide (501-20A Seatbelt Systems, General Procedures). If the seat is not assembled correctly, correct the installation. REFER to section 501-10A or section 501-20A and the appropriate procedure.
If the seatbelt webbing is incorrectly routed, correct the installation. REFER to section 501-05 or section 501-20A and the appropriate procedure.
If the concern was confirmed, CORRECT the concern. If not, GO to B6

B6 CHECK THE SEATBELT RETRACTOR RETRACTION
  • NOTE: Do NOT extract the seatbelt webbing all the way out to prevent the seatbelt retractor from engaging ALR (Automatic Locking Retractor) mode. Extract the seatbelt webbing from the seatbelt retractor.
  • Allow the seatbelt webbing to retract back onto the seatbelt retractor spool.

Does the seatbelt retractor allow retraction of the seatbelt?
Yes If the concern can't be duplicated, the seatbelt system is working correctly. Return the vehicle to the customer.
No Carry out the Seatbelt Retractor Functional Test.
REFER to: Seatbelt System Functional Tests (501-20A Seatbelt Systems, General Procedures). If the concern was confirmed, CORRECT the concern.

PINPOINT TEST C: SEAT BELT WEBBING CONCERNS

Normal Operation and Fault Conditions

The seatbelt tongue is rotated on the seatbelt webbing

    The seatbelt tongue is rotated on the seatbelt webbing

  • REFER to: Seatbelt Tongue Rotated On Belt (501-20A Seatbelt Systems, General Procedures).

The seatbelt webbing is twisted at the seatbelt guide

    The seatbelt webbing is twisted at the seatbelt guide

  • REFER to: Seatbelt Twisted at the Seatbelt Guide (501-20A Seatbelt Systems, General Procedures).

The seatbelt webbing is dirty or soiled

    The seatbelt webbing is dirty or soiled

  • REFER to: Seatbelt Cleaning (501-20A Seatbelt Systems, General Procedures).

Possible Sources

  • Twisted or incorrectly routed seatbelt webbing
  • Dirty or soiled seatbelt webbing
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST D: THE REAR SEATBELT RTT (RECONFIGURABLE TELLTALE) WARNING INDICATOR IS NEVER OR ALWAYS DISPLAYED

  WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

NOTE: Always make sure the correct SRS (supplemental restraint system) component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS (supplemental restraint system) component is installed, Diagnostic Trouble Codes (DTCs) may set.

NOTE: The SRS (supplemental restraint system) must be fully operational and free of faults before releasing the vehicle to the customer.

Normal Operation and Fault Conditions

The RCM monitors the second row seatbelt buckle switches for buckled/unbuckled status.

Possible Sources

  • Rear seatbelt buckle
D1 CHECK THE MESSAGE CENTER OPERATION

  • REFER to: Pyrotechnic Device Health and Safety Precautions (100-00 General Information, Description and Operation).
  • Diagnose the rear seatbelt RTT warning indicator is never or always displayed.
    REFER to: Instrumentation, Message Center and Warning Chimes (413-01 Instrumentation, Message Center and Warning Chimes, Diagnosis and Testing).
    REFER to: Instrumentation, Message Center and Warning Chimes - Vehicles With: Head Up Display (HUD) (413-01 Instrumentation, Message Center and Warning Chimes, Diagnosis and Testing).

Was the concern resolved in section 413-01A?
Yes The concern has been corrected. Check the system for correct operation.
No GO to D2

D2 RETRIEVE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, perform RCM self-test.

Are any RCM Diagnostic Trouble Codes (DTCs) recorded?
Yes
REFER to: Airbag Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Diagnosis and Testing).
No Install a new seatbelt buckle.
REFER to: Second Row Center Seatbelt Buckle (501-20A Seatbelt Systems, Removal and Installation).
REFER to: Second Row Seatbelt Buckle (501-20A Seatbelt Systems, Removal and Installation).
REFER to: Third Row Double Seat Center Seatbelt Buckle (501-20A Seatbelt Systems, Removal and Installation).
REFER to: Third Row Double Seat Outer Seatbelt Buckle (501-20A Seatbelt Systems, Removal and Installation).
REFER to: Third Row Single Seat Seatbelt Buckle (501-20A Seatbelt Systems, Removal and Installation).


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