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Contents Wiring diagrams Section: Restraints Control Systems All sections

Seat Belt System Chevrolet Cab & Chassis Silverado 3500 HD

Restraints Control Systems 15 illustrations ~2736 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Seat Belt Anchor Plate Bolts70 N.m52 lb ft
Seat Belt Assembly Bolts52 N.m38 lb ft
Seat Belt Assembly Nuts52 N.m38 lb ft
Seat Belt Bracket Screws2 N.m18 lb in
Seat Belt Guide Adjuster Bolts50 N.m37 lb ft
Seat Belt Retractor Assembly Bolts43 N.m32 lb ft

Scheme 1

Scheme 1: Seat Belt Schematics
Scheme 1: Seat Belt Schematics

Diagnostic Starting Point - Seat Belts

Begin the system diagnosis by reviewing the Seat Belt System Description and Operation . Reviewing the Description and Operation will help identify the correct symptom diagnostic procedure when a malfunction exists. The Description and Operation will also assist in determining if the condition described by the customer is normal system operation. Refer to Symptoms - Seat Belts in order to identify the correct procedure for diagnosing the system and where the procedure is located.

Note. If the vehicle has been in a collision, refer to Repairs and Inspections Required After a Collision for additional information.

Perform the following inspection from the driver seat

  1. Turn the ignition switch to the ON position. Verify proper operation of the seat belt reminder lamp with the belt buckled and with the belt unbuckled.
  2. Inspect the shoulder belt guide in order to ensure that the following conditions are met: The shoulder belt guide swivels freely in the rear seat position. The seat belt webbing is seated flatly in the guide slot. The seat belt webbing does not bind.
  3. Verify that the seat belt buckle faces inboard and is accessible.
  4. Verify that the seat belt retractor units are securely attached.
  5. Verify that the seat belt anchor bolts are secure.
  6. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.
  7. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely back into the retractor. If the seat belt webbing will not retract, refer to «Seat Belt Does Not Retract»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system__seat-belt-does-not-retract) .
  8. Snap the seat belt latch plate into the buckle.
  9. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.
  10. Push the button on the buckle: Verify that the seat belt latch plate releases easily from the buckle. Verify that the button returns to its original position.

Repeat the inspection procedure, steps 2-10, from the front passenger seat.

Test the function of the automatic locking child restraint feature

  1. To engage the automatic locking feature, pull the belt to the fully extended position. Allow the belt to retract to the proper position for the child seat and fasten the latch plate to the buckle. As the belt retracts, a ratcheting sound should be heard.
  2. To disengage the automatic locking feature, allow the belt to retract to the fully stowed position. Before the belt is completely stowed, the cinch feature will reset, the ratcheting sound will stop and the belt will extract freely.

Perform the following steps in order to inspect the center seat belts

  1. Verify that the center seat belts are accessible.
  2. Verify that the center seat belts have no twists or tears in the webbing.
  3. Snap the center seat belt latch plate into the buckle.
  4. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.
  5. Push the button on the buckle: Verify that the seat belt latch plate releases easily from the buckle. Verify that the button returns to its original position.

Repeat the inspection procedure, steps 2-10, from the rear seats. The child restraint feature is located on the outboard position for the rear seat.

Repeat the center seat belt inspection procedure, steps 1-5, from the rear seat.

Emergency Locking Retractors

WARNINGPerform this test in an area clear of other vehicles or obstructions. Do not conduct this test on the open road. A large, empty parking lot is suitable. Failure to observe this precaution may result in damage to the vehicle and possible personal injury.

Scheme 2

Scheme 2
Scheme 2
  1. Fasten the seat belts, an assistant is needed when the retractor under test is not part of the driver seat belt.
  2. Accelerate the vehicle slowly to 16 km/h (10 mph) and apply the brakes firmly.
  3. Verify that the seat belt locks when braking firmly.
  4. If the belt does not lock, proceed with the following steps: Remove the seat belt retractor assembly. Tilt the seat belt retractor slowly. Ensure that the seat belt webbing can be pulled from the retractor at an inclination of 15 degrees or less and cannot be pulled from the retractor at an inclination of 60 degrees or more. If the seat belt retractor does not operate as described, replace the retractor assembly. Refer to the following procedures: «Seat Belt Retractor Pretensioner Replacement - Front (Regular Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system) , «Seat Belt Retractor Pretensioner Replacement - Front (Extended Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system) or «Seat Belt Retractor Pretensioner Replacement - Front (Crew Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system) «Front Seat Center Buckle Side Belt Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system) «Seat Belt Replacement - Center Rear (Crew Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system) or «Seat Belt Replacement - Center Rear (Extended Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system) «Rear Seat Belt Retractor Replacement (Crew Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system) or «Rear Seat Belt Retractor Replacement (Extended Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system)

Symptoms - Seat Belts

IMPORTANTReview the seat belt system description and operation in order to familiarize yourself with the system and how it functions. Refer to Seat Belt System Description and Operation .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the seat belt system. Refer to «Checking Aftermarket Accessories»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

  1. Refer to «Seat Belt Indicator Circuit Malfunction - Driver»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system) in order to diagnose the symptom.
  2. Refer to «Seat Belt Indicator Circuit Malfunction - Passenger»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system) in order to diagnose the symptom.

Seat Belt Does Not Retract

  1. Grab the seat belt webbing and slowly and firmly extract 15-25 mm (5/8-1 in) of webbing from the seat belt.
  2. Release the seat belt and allow the webbing to slowly retract back into the retractor.
  3. Check to see if the seat belt is released. If the seat belt is not released, repeat steps 1 and 2, two times more.
  4. If the retractor does not release after repeating the steps, replace with a new retractor.

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Seat Belt Switch Signal12
Low Reference2
Indicator will remain ON with seat belt buckled. Indicator will illuminate only for the bulb test.

Circuit/System Description

The driver seat belt switch is a 2-wire switch wired to the inflatable restraint sensing and diagnostic module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The SDM sends the status of the driver seat belt via serial data to the instrument panel cluster (IPC). After receiving the message, the IPC controls the illumination of the driver seat belt indicator.

Reference Information

Schematic Reference

  1. «Seat Belt Schematics»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system)
  2. «SIR Schematics»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool Information

Circuit/System Verification

  1. Ignition ON, with a scan tool perform the IPC Display Test and verify the driver seat belt indicator is illuminated for 5 seconds. If the indicator does not illuminate, replace the IPC.
  2. Monitor the SDM Driver Seat Belt Switch parameter while connecting and disconnecting the seat belt. The parameter should display Buckled and Unbuckled when changing seat belt states.

Circuit/System Testing

IMPORTANTWhen removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the appropriate component/connector: The SDM The SDM wiring harness connector The seat belt buckle The seat belt buckle wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the driver seat belt switch.
  2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal B and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the SDM.
  3. Ignition ON, verify the scan tool Driver Seat Belt Switch parameter is Unbuckled. If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the SDM.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Driver Seat Belt Switch parameter is Buckled. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the SDM.
  5. If all circuits test normal, test or replace the seat belt buckle assembly.

Component Testing

  1. Ignition OFF, disconnect the harness connector at the seat belt switch.
  2. With the seat belt buckled, test for infinite resistance between the signal circuit terminal A and the low reference terminal B. If not the specified range, replace the seat belt switch.
  3. With the seat belt unbuckled, test for less than 2 ohms of resistance between the signal circuit terminal A and the low reference terminal B. If greater than the specified range, replace the seat belt switch.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Driver or Passenger Seat Belt Buckle Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM and IPC replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Low Reference2
Seat Belt Switch Signal12
Ignition 1 Voltage33
Passenger Seat Belt Indicator Control45
The passenger seat belt indicator will remain ON with seat occupied and the seat belt buckled. The passenger seat belt indicator will not illuminate with the seat occupied and the seat belt disconnected, but will illuminate for the bulb test. No indicator on the inflatable restraint passenger air bag ON/OFF indicator will illuminate at any time. The passenger seat belt indicator will illuminate at all times. The passenger seat belt indicator will never illuminate but the PPS ON/OFF indicator does.

The seat belt buckle switch is located within the seat belt buckle assembly and provides an input to the inflatable restraint sensing and diagnostic module (SDM). The SDM supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition.

If the SDM determines the driver seat belt has not been buckled, the SDM will send a serial data message to the instrument panel cluster (IPC) to illuminate the seat belt warning indicator. If the SDM determines that a passenger is sitting in the passenger seat and the seat belt has not been buckled, the SDM will send a serial data message to the passenger presence system (PPS) display to illuminate the passenger seat belt warning indicator.

Schematic Reference

  1. «Seat Belt Schematics»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system)
  2. «SIR Schematics»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system)
  3. «Seat Belt Schematics»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/restraints-control-systems/#seat-belt-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  3. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)
  4. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Passenger Seat Belt Switch parameter while buckling and unbuckling the passenger seat belt. The parameter should change between Buckled and Unbuckled. If the parameter does not cycle between the specified values, refer to Passenger Seat Belt Switch Circuit Malfunction.
  2. Ignition ON, while sitting in the passenger seat with the seat belt unbuckled, verify the passenger seat belt warning indicator is illuminated on the PPS display. If the indicator is not illuminated, replace the PPS display.

Passenger Seat Belt Switch Circuit Malfunction

IMPORTANTWhen removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the appropriate component/connector: The SDM The SDM wiring harness connector The seat belt buckle The seat belt buckle wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the passenger seat belt switch.
  2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal B X1 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the SDM.
  3. Ignition ON, verify the scan tool Passenger Seat Belt Switch parameter is Unbuckled. If not the specified value, test the signal circuit terminal A X1 for a short to ground. If the circuit tests normal, replace the SDM.
  4. Install a 3A fused jumper wire between the signal circuit terminal A X1 and the low reference circuit terminal B X1. Verify the scan tool Passenger Seat Belt Switch parameter is Buckled. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the SDM.
  5. If all circuits test normal, test or replace the seat belt buckle assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Seat Belt Retractor Pretensioner Replacement - Front (Regular Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system) , «Seat Belt Retractor Pretensioner Replacement - Front (Extended Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system) or «Seat Belt Retractor Pretensioner Replacement - Front (Crew Cab)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/airbag/#supplemental-inflatable-restraint-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, setup, and programming

Repairs and Inspections Required After a Collision

WARNINGRestraint systems can be damaged in a collision. To help avoid injury and ensure that all parts in need of replacement are replaced: Replace any seat belt system that was in use during the collision serious enough to deploy any automatic restraint device such as air bags and seat belt pretensioners. This not only includes seat belt systems in use by people of adult size, but seat belt systems used to secure child restraints, infant carriers and booster seats, including LATCH system and top tether anchorages. Replace any seat belt system that has torn, worn, or damaged components. This not only includes adult seat belt systems, but built-in child restraints and LATCH system components, if any. Replace any seat belt system if you observe the words "REPLACE" or "CAUTION", or if a yellow tag is visible. Do not replace a seat belt if only the child seat caution label is visible. Replace any seat belt system if you are doubtful about its condition. This not only includes adult seat belt systems, but built-in child restraints, LATCH system components, and any restraint system used to secure infant carriers, child restraints, and booster seats. Do NOT replace single seat belt system components in vehicles that have been in a collision as described above. Always replace the entire seat belt system with the buckle, guide and retractor assembly, which includes the latch and webbing material.

After a minor collision where no automatic restraint device was deployed, seat belt system replacement may not be necessary, unless some of the parts are torn, worn, or damaged.

Scheme 3

Scheme 3: Seat Belt Latch Stop Installation
Scheme 3: Seat Belt Latch Stop Installation
CalloutComponent Name
Preliminary Procedure Locate the hole in the seat belt webbing where the original seat belt stop button was located. If the original hole in the seat belt webbing is not visible, perform the following: If either the right or left stop button is missing use the opposing seat belt as a reference. With the opposing seat belt fully stowed, measure the distance between the seat belt lower anchor and the stop button. Using the measurement obtained above, measure and mark the location of the missing stop button on the center of the seat belt webbing. Ensure the seat belt latch plate is located above the mark or original hole.
1Seat Belt Stop Button Procedure Work the male half of the stop button through the hole in the webbing or at the marked location. Align the female half of the stop button with the male half of the stop button. Snap the two halves together. Trim off any access of the male half of the stop button flush with the female half of the stop button. Tip: Ensure the male half of the stop button is facing forward in the vehicle in order to ensure the stop button will not snag customers clothing.

Scheme 4

Scheme 4: Driver or Passenger Seat Belt Buckle Replacement
Scheme 4: Driver or Passenger Seat Belt Buckle Replacement
CalloutComponent Name
Preliminary Procedures: Remove front bucket seat. Refer to Front Seat Replacement - Bucket .
1Front Seat (Buckle Side) Belt Cover
2Front Seat (Buckle Side) Belt Cover Retainer (Qty: 2)
3Front Seat (Buckle Side) Belt Nut CAUTION: Refer to Fastener Caution . Tighten: 52 N.m (38 lb ft)
4Front Seat (Buckle Side) Belt Assembly Tip: Disconnect electrical connector.
CAUTION
Refer to Fastener Caution .

Scheme 5

Scheme 5: Rear Seat Center Belt Buckle Replacement (Crew Cab)
Scheme 5: Rear Seat Center Belt Buckle Replacement (Crew Cab)
CalloutComponent Name
1Rear Seat Buckle Bolt CAUTION: Refer to Fastener Caution . Tip: Fold the rear seat cushion up to access the buckle assembly and bolt. Tighten: 53 N.m (39 lb ft)
2Rear Seat Buckle Assembly
CAUTION
Refer to Fastener Caution .

Scheme 6

Scheme 6: Rear Seat Center Belt Buckle Replacement (Ext Cab w/AM7)
Scheme 6: Rear Seat Center Belt Buckle Replacement (Ext Cab w/AM7)
CalloutComponent Name
Preliminary Procedure: Remove rear bench seat. Refer to Rear Seat Replacement (Crew Cab with A68) , Rear Seat Replacement (Extended Cab with AM7) or Rear Seat Replacement (Extended Cab with A68) .
1Rear Seat Buckle Nut CAUTION: Refer to Fastener Caution . Tighten: 53 N.m (39 lb ft)
2Rear Seat Buckle Assembly
CAUTION
Refer to Fastener Caution .

Scheme 7

Scheme 7: Rear Seat Center Belt Buckle Replacement (Ext Cab w/A68)
Scheme 7: Rear Seat Center Belt Buckle Replacement (Ext Cab w/A68)
CalloutComponent Name
1Rear Seat Buckle Bolt CAUTION: Refer to Fastener Caution . Tip: Fold the rear seat cushion up to access the buckle assembly and bolt. Tighten: 53 N.m (39 lb ft)
2Rear Seat Buckle Assembly
CAUTION
Refer to Fastener Caution .

Scheme 8

Scheme 8: Front Seat Center Buckle Side Belt Replacement
Scheme 8: Front Seat Center Buckle Side Belt Replacement
CalloutComponent Name
WARNING: Refer to SIR Warning . WARNING: In order to prevent accidental deployment and the risk of personal injury, do not dispose of an undeployed inflatable restraint seat belt pretensioner as normal shop waste. Undeployed seat belt pretensioners contain substances that could cause severe illness or personal injury if their sealed containers are damaged during disposal. Use the following deployment procedures to safely dispose of an undeployed seat belt pretensioner. Failure to observe the following disposal methods may be a violation of federal, state, or local laws. Preliminary Procedure Remove the driver seat. Refer to Front Seat Replacement - Bucket . Remove the jack stowage cover. Refer to Jack Stowage Cover Replacement . Remove the rear window lower trim. Refer to Rear Window Lower Garnish Molding Replacement (Ext Cab/Crew Cab w/A48) , Rear Window Lower Garnish Molding Replacement (Ext Cab/Crew Cab w/o A48) or Rear Window Lower Garnish Molding Replacement (Regular Cab) . Remove the rear inner panel carpet. Refer to Body Rear Inner Panel Carpet Replacement .
1Front Center Seat Belt Anchor Plate Bolt CAUTION: Refer to Fastener Caution . Tighten: 43 N.m (32 lb ft)
2Front Center Seat Shoulder Belt Guide
3Front Center Seat Belt Retractor Nut (Qty: 2) Tip: Position carpet in order to access nuts. Tighten: 43 N.m (32 lb ft)
4Front Center Seat Shoulder Belt Retractor Assembly Tip: Disconnect electrical connector.
WARNING
Refer to SIR Warning .
WARNING
In order to prevent accidental deployment and the risk of personal injury, do not dispose of an undeployed inflatable restraint seat belt pretensioner as normal shop waste. Undeployed seat belt pretensioners contain substances that could cause severe illness or personal injury if their sealed containers are damaged during disposal. Use the following deployment procedures to safely dispose of an undeployed seat belt pretensioner. Failure to observe the following disposal methods may be a violation of federal, state, or local laws.
CAUTION
Refer to Fastener Caution .

Scheme 9

Scheme 9: Seat Belt Replacement - Center Rear (Crew Cab)
Scheme 9: Seat Belt Replacement - Center Rear (Crew Cab)
CalloutComponent Name
Preliminary Procedure: Remove rear bench seat. Refer to Rear Seat Replacement (Crew Cab with A68) , Rear Seat Replacement (Extended Cab with AM7) or Rear Seat Replacement (Extended Cab with A68) .
1Rear Center Seat Belt Anchor Plate Nut CAUTION: Refer to Fastener Caution . Tighten: 45 N.m (33 lb ft)
2Rear Center Seat Belt Guide
3Rear Center Seat Belt Retractor Bolt Tighten: 45 N.m (33 lb ft)
4Rear Center Seat Belt Assembly Procedure Use a pry bar or flat-bladed tool to separate the seat belt buckle from the seat belt anchor plate. Route the seat belt through guide on the body rear inner panel.
5Rear Seat Center Bracket Nut Tighten: 45 N.m (33 lb ft)
6Rear Seat Center Bracket
CAUTION
Refer to Fastener Caution .

Scheme 10

Scheme 10: Seat Belt Replacement - Center Rear (Extended Cab)
Scheme 10: Seat Belt Replacement - Center Rear (Extended Cab)
CalloutComponent Name
Preliminary Procedure: Remove rear bench seat. Refer to Rear Seat Replacement (Crew Cab with A68) , Rear Seat Replacement (Extended Cab with AM7) or Rear Seat Replacement (Extended Cab with A68) .
1Rear Center Seat Belt Anchor Plate Nut CAUTION: Refer to Fastener Caution . Tighten: 45 N.m (33 lb ft)
2Rear Center Seat Belt Guide
3Rear Center Seat Belt Assembly Tip: Route seat belt through guide on body rear inner panel.
CAUTION
Refer to Fastener Caution .

Scheme 11

Scheme 11: Seat Belt Height Adjuster Knob Replacement - Front
Scheme 11: Seat Belt Height Adjuster Knob Replacement - Front
CalloutComponent Name
1Front Seat Belt Height Adjuster Knob

Scheme 12

Scheme 12: Seat Belt Height Adjuster Replacement - Front
Scheme 12: Seat Belt Height Adjuster Replacement - Front
CalloutComponent Name
Preliminary Procedure Remove front door sill plate. Refer to Front Side Door Sill Trim Plate Replacement (Extended Cab) or Front Side Door Sill Trim Plate Replacement (Regular Cab/Crew Cab) . Remove rear door sill plate. Refer to Rear Side Door Sill Trim Plate Replacement (Crew Cab) or Rear Side Door Sill Trim Plate Replacement (Extended Cab) . Remove front seat shoulder belt adjuster cover. Refer to Seat Belt Height Adjuster Knob Replacement - Front . Remove center pillar lower garnish molding. Refer to Center Pillar Lower Garnish Molding Replacement . Remover center pillar upper garnish molding. Refer to Center Pillar Upper Garnish Molding Replacement . Remove front seat belt. Refer to Seat Belt Retractor Pretensioner Replacement - Front (Regular Cab) , Seat Belt Retractor Pretensioner Replacement - Front (Extended Cab) or Seat Belt Retractor Pretensioner Replacement - Front (Crew Cab) .
1Front Seat Shoulder Belt Guide Adjuster Bolt (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 50 N.m (37 lb ft)
2Front Seat Shoulder Belt Guide Adjuster Assembly
CAUTION
Refer to Fastener Caution .

Scheme 13

Scheme 13: Rear Seat Belt Retractor Replacement (Crew Cab)
Scheme 13: Rear Seat Belt Retractor Replacement (Crew Cab)
CalloutComponent Name
Preliminary Procedure Disable the SIR. Refer to SIR Disabling and Enabling . Remove rear bench seat. Refer to Rear Seat Replacement (Crew Cab with A68) , Rear Seat Replacement (Extended Cab with AM7) or Rear Seat Replacement (Extended Cab with A68) . Remove the rear window lower molding. Refer to Rear Window Lower Garnish Molding Replacement (Ext Cab/Crew Cab w/A48) , Rear Window Lower Garnish Molding Replacement (Ext Cab/Crew Cab w/o A48) or Rear Window Lower Garnish Molding Replacement (Regular Cab) . Remove rear door sill plate. Refer to Rear Side Door Sill Trim Plate Replacement (Crew Cab) or Rear Side Door Sill Trim Plate Replacement (Extended Cab) . Remove the body lock pillar trim panel. Refer to Body Lock Pillar Trim Replacement (Crew Cab) , Body Lock Pillar Trim Replacement (Extended Cab) or Body Lock Pillar Trim Replacement (Regular Cab) .
1Rear Seat Belt Anchor Plate Nut CAUTION: Refer to Fastener Caution . Tighten: 45 N.m (33 lb ft)
2Tighten: 45 N.m (33 lb ft)
3Rear Seat Belt Guide
4Rear Seat Belt Retractor Bolt Tighten: 45 N.m (33 lb ft)
5Rear Seat Belt Assembly Tip: Route seat belt through slot in body lock pillar trim panel.
CAUTION
Refer to Fastener Caution .

Scheme 14

Scheme 14: Rear Seat Belt Retractor Replacement (Extended Cab)
Scheme 14: Rear Seat Belt Retractor Replacement (Extended Cab)
CalloutComponent Name
Preliminary Procedure Disable the SIR. Refer to SIR Disabling and Enabling . Remove rear bench seat. Refer to Rear Seat Replacement (Crew Cab with A68) , Rear Seat Replacement (Extended Cab with AM7) or Rear Seat Replacement (Extended Cab with A68) . Remove the rear window lower molding. Refer to Rear Window Lower Garnish Molding Replacement (Ext Cab/Crew Cab w/A48) , Rear Window Lower Garnish Molding Replacement (Ext Cab/Crew Cab w/o A48) or Rear Window Lower Garnish Molding Replacement (Regular Cab) . Remove rear door sill plate. Refer to Rear Side Door Sill Trim Plate Replacement (Crew Cab) or Rear Side Door Sill Trim Plate Replacement (Extended Cab) . Remove the body lock pillar trim panel. Refer to Body Lock Pillar Trim Replacement (Crew Cab) , Body Lock Pillar Trim Replacement (Extended Cab) or Body Lock Pillar Trim Replacement (Regular Cab) .
1Rear Seat Belt Anchor Plate Nut CAUTION: Refer to Fastener Caution . Tighten: 45 N.m (33 lb ft)
2Rear Seat Belt Upper Guide Bolt Tighten: 45 N.m (33 lb ft)
3Rear Seat Belt Guide
4Rear Seat Belt Retractor Bolt Tighten: 45 N.m (33 lb ft)
5Rear Seat Belt Assembly Tip: Route seat belt through slot in body lock pillar trim panel.
CAUTION
Refer to Fastener Caution .

Scheme 15

Scheme 15: Child Seat Restraint System Belt Bracket Replacement (Ext Cab/Crew Cab)
Scheme 15: Child Seat Restraint System Belt Bracket Replacement (Ext Cab/Crew Cab)
CalloutComponent Name
Preliminary Procedure: Remove the rear seat. Refer to Rear Seat Replacement (Crew Cab with A68) , Rear Seat Replacement (Extended Cab with AM7) or Rear Seat Replacement (Extended Cab with A68) .
1Child Seat Restraint System Belt Bracket Bolt (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 35 N.m (26 lb ft)
2Child Seat Restraint System Belt Bracket Assembly (Qty: 3)
CAUTION
Refer to Fastener Caution .

Restraint System

Seat belts are the primary means of occupant restraint.

Seat belts help to keep occupants inside the passenger compartment and to gradually reduce the impact forces.

All seat belt retractors have emergency locks. The retractors remain unlocked during normal operation and under normal driving conditions. The retractors remain unlocked during normal conditions in order to allow free movement of the upper body of each occupant.

A pendulum locks the seat belt webbing into position. The pendulum causes a locking bar to engage a cog on the spool of the retractor mechanism when the following conditions occur

  1. A rapid extraction of the seat belt webbing from the retractor
  2. An abrupt change in the vehicle speed
  3. An abrupt change in the vehicle direction
  4. Operation of the vehicle on a steep upgrade
  5. Operation of the vehicle on a steep downgrade

The seat belts, except for the driver seat belt, have an automatic locking feature, or a cinch feature. The cinch feature is recommended for securing a child seat. The cinch feature is engaged by fully extending the seat belt from the retractor. Once engaged, the seat belt can retract, but cannot be extended again until the cinch feature is cancelled. The cinch feature is cancelled when the seat belt has fully retracted.

This vehicle is also equipped with a supplemental inflatable restraint (SIR) system. Refer to SIR System Description and Operation for a description of the seat belt pretensioner system.

The front seat belt system includes the following components

  1. The driver and passenger seat belt buckles, attached to the inboard side of the seat frame
  2. The driver and passenger seat belt pretensioners
  3. The driver and passenger seat belt switch located in the seat belt buckles

There are two fasten safety belt indicators for this vehicle. The driver fasten safety belt indicator is located on the instrument panel cluster (IPC) and the passenger fasten safety belt indicator is located near the center of the instrument panel (I/P). Both indicators are controlled by the IPC at the request of the inflatable restraint sensing and diagnostic module (SDM). The driver and passenger indicators when initiated will illuminate for 20 seconds followed by 55 seconds of flashing. Audible warnings will initiate simultaneously with visual warnings and last for 8 seconds. Subsequently, similar events will occur until the seat belts are buckled or the ignition is returned to the OFF position.

The driver fasten safety belt indicator will illuminate when any of the following occur

  1. The driver seat belt is unbuckled while the ignition is ON.
  2. The driver seat belt remains unbuckled and vehicle speed is greater than 8 km/h (5 mph).
  3. Three minutes after previous seat belt status reminder event
  4. The IPC performs the displays test at the start of each ignition cycle.
IMPORTANTThe front passenger seat is equipped with a passenger presence system (PPS), which detects an occupant. If the PPS detects an empty front passenger seat, then the passenger fasten safety belt indicator will be disabled.

The passenger fasten safety belt indicator will illuminate when any of the following occur

  1. Twenty-five seconds after the ignition is ON and the front passenger seat belt remains unbuckled with passenger present
  2. The front passenger seat belt remains unbuckled with passenger present and vehicle speed is greater than 5 mph (8 km/h).
  3. Three minutes after previous seat belt status reminder event
  4. The IPC performs the displays test at the start of each ignition cycle.

Refer to Symptoms - Seat Belts in order to diagnose faults of the fasten safety belt indicators.

See also:
• Rear Seat Cushion Cover and Pad Replacement (Extended Cab with A68)
• Seat Belt Retractor Pretensioner Replacement - Front (Regular Cab)
• Checking Aftermarket Accessories
• Testing for Intermittent Conditions and Poor Connections
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Fastener Caution
• SIR Warning
• Jack Stowage Cover Replacement
• Body Rear Inner Panel Carpet Replacement
• SIR Disabling and Enabling
• Seat Belt System Description and Operation
• Symptoms - Seat Belts
• Repairs and Inspections Required After a Collision
• Seat Belt Does Not Retract