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Seat Belt System Chevrolet Express G3500

Restraints Control Systems 7 illustrations ~4689 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Center Seat Belt Retractor Bolts52 N.m38 lb ft
Center Seat Belt Retractor Trim Cover Bolt1.5 N.m13 lb in
Seat Belts and Buckles to the Seat Frame Bolts40 N.m30 lb ft
Seat Belt Guide to the Vehicle Bolt52 N.m38 lb ft
Seat Belt Height Adjuster to the Vehicle Bolts26 N.m19 lb ft
Shoulder/Seat Belt Retractor to the Vehicle Lower Bolt (8mm bolt)10 N.m89 lb in
Shoulder/Seat Belt Retractor to the Vehicle Upper Bolt (12mm bolt)52 N.m38 lb ft

Fastener Tightening Specifications

Scheme 1

Scheme 1: Seat Belt System (without C99 without YF7)
Scheme 1: Seat Belt System (without C99 without YF7)

Scheme 2

Scheme 2: Seat Belt System (C99)
Scheme 2: Seat Belt System (C99)

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. The seat belt webbing is seated flat 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/express-g3500/2013-2013/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.

Perform the following inspection procedure from the passenger seat.

  1. Verify the automatic locking retractor (ALR) feature operates properly by performing the following checks: Pull the seat belt all the way out of the retractor until it stops. Slowly allow the belt to retract partially, while listening for a ratcheting sound. Sharply tug on the belt ensuring that the retractor lock sets and does not allow the belt to be pulled from the retractor. After performing steps 1.1 through 1.3 ensure the belt fully retracts.
  2. Repeat the inspection procedure steps 2 through 10 from the passengers seat.

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.

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 3

Scheme 3
Scheme 3
  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 forward or less, from the retractors mounted position. Ensure the retractor cannot be pulled from the retractor at an inclination of 45 degrees forward or more. If a seat belt retractor does not operate as described, replace the retractor assembly.

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/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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 Malfunction - Driver»(/chevrolet/express-g3500/2013-2013/remont/restraints-control-systems/#seat-belt-system) in order to diagnose the symptom.
  2. Refer to «Seat Belt Indicator Malfunction - Passenger»(/chevrolet/express-g3500/2013-2013/remont/restraints-control-systems/#seat-belt-system) in order to diagnose the symptom.

Seat Belt Does Not Retract

  1. Grasp the seat belt and pull it out slowly and evenly from the retractor, do that in 15-25mm (5/8-1in) increments, continuing until the seat belts entire length has been pulled out.
  2. Release the seat belt, and allow the retractor to slowly retract the full length of the seat belt. The seat belt must retract without any additional help.
  3. Additionally, make sure, that the seat belt can be stopped any time while retracting and then resumed while being released again. This must also be possible in all retracting positions.
  4. Should problems be observed in step 3, perform the first two steps 2 more times.
  5. Should the retractor, after performing these steps, not function freely and properly, it is to be replaced with a new part.

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Low Reference2
Seat Belt Switch Signal12
Ignition 1 Voltage33
Driver Seat Belt Indicator Control45
1. The driver seat belt indicator will remain ON with seat occupied and the seat belt buckled. 2. The driver seat belt indicator will not illuminate with the seat occupied and the seat belt disconnected, but will illuminate for the bulb test. 3. No indicator on the inflatable restraint driver air bag ON/OFF indicator will illuminate at any time. 4. The driver seat belt indicator will illuminate at all times. 5. The driver seat belt indicator will never illuminate but the PPS ON/OFF indicator does.

Circuit/System Description

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 clutch (IPC) to illuminate the seat belt warning indicator. If the SDM determines that a driver is sitting in the driver 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 driver seat belt warning indicator.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  3. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  4. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

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

Circuit/System Testing

Note. When 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

Driver Seat Belt Switch Circuit Malfunction.

  1. Ignition OFF, disconnect the harness connector at the driver seat belt switch.
  2. Ignition ON, test for less than 10 ohms between the low reference circuit terminal A (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 Driver Seat Belt Switch parameter is Unbuckled. If not the specified value, test the signal circuit terminal B (X1) for a short to ground. If the circuit tests normal, replace the SDM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal B (X1) and the low reference circuit terminal A (X1). 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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Seat Belt Buckle Pretensioner Replacement»(/chevrolet/express-g3500/2013-2013/remont/airbag/#supplemental-inflatable-restraint-system)
  2. «Control Module References»(/chevrolet/express-g3500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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
1. The passenger seat belt indicator will remain ON with seat occupied and the seat belt buckled. 2. The passenger seat belt indicator will not illuminate with the seat occupied and the seat belt disconnected, but will illuminate for the bulb test. 3. No indicator on the inflatable restraint passenger air bag ON/OFF indicator will illuminate at any time. 4. The passenger seat belt indicator will illuminate at all times. 5. 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 clutch (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.

Diagnostic Aids

Objects on the passenger seat can cause the passenger seat belt reminder to be commanded on. Depending on the sensing technology used, a conductive object (computers, MP3 players, cell phones, diagnostic scan tool, wires, a hand, etc.) placed on the passenger seat may cause the Passenger Presence Detection Module to command the passenger air bag indicator ON and/or command the passenger seat belt indicator ON. The fasten seat belt chime will also sound.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  3. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  4. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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.

Note. When 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

Passenger Seat Belt Switch Circuit Malfunction.

  1. Ignition OFF, disconnect the harness connector at the passenger seat belt switch.
  2. Ignition ON, test for less than 10 ohms between the low reference circuit terminal A (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 B (X1) for a short to ground. If the circuit tests normal, replace the SDM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal B (X1) and the low reference circuit terminal A (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 repair

  1. «Seat Belt Buckle Pretensioner Replacement»(/chevrolet/express-g3500/2013-2013/remont/airbag/#supplemental-inflatable-restraint-system)
  2. «Control Module References»(/chevrolet/express-g3500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, programming and setup

Seat Belt Service Precautions

  1. Do not bleach or dye the seat belt webbing. Clean the seat belt webbing only with a mild soap and water solution and a soft brush or cloth.
  2. Keep sharp edges and damaging objects away from the seat belts. Avoid bending or damaging any part of the seat belt buckle or latch plate.
  3. Replace any seat belts which are cut or damaged in any way.
  4. Use only correct seat belt anchor bolts and screws. Tighten the bolts and the screws to the correct torque value. Refer to «Fastener Tightening Specifications»(/chevrolet/express-g3500/2013-2013/remont/restraints-control-systems/#seat-belt-system__fastener-tightening-specifications) . When installing the seat belt anchor bolts, start the bolt by hand in order to ensure that the bolt is threaded straight.
  5. Some seat belts and retractors must be serviced as a set with service replacement parts only. Do not attempt to make repairs to the individual components which are only serviced as a set.
  6. Verify that the replacement part number is correct for the vehicle at that seating position. Do not substitute a seat belt from a different seating position.

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 4

Scheme 4: Seat Belt Latch Stop Installation
Scheme 4: 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.

Seat Belt Latch Stop Installation

Removal Procedure

  1. Remove seat belt bolt cover.
  2. Remove the seat belt buckle retaining bolt from the seat.
  3. Disconnect the electrical connector from the seat belt buckle, if equipped.
  4. Remove the seat belt buckle from the seat.

Installation Procedure

  1. Install the seat belt buckle to the seat.
  2. Connect the electrical connector to the seat belt buckle, if equipped.
  3. Install the seat belt buckle retaining bolt to the seat and tighten to 52 N.m (38 lb ft).
  4. Install seat belt bolt cover.
  1. Partially remove the seat cushion cover in order to gain access to the seat belt buckle retaining bolt.
  2. Remove the seat belt buckle retaining bolt from the seat frame.
  3. Remove the seat belt buckle from the seat frame.
  1. Install the seat belt buckle to the seat frame.
  2. Install the seat belt buckle retaining bolt to the seat frame and tighten to 40 N.m (30 lb ft).
  3. Install the seat cushion cover to the seat frame.

Scheme 5

Scheme 5: Rear Seat Center Buckle Side Belt Replacement (with Split Bench Seat)
Scheme 5: Rear Seat Center Buckle Side Belt Replacement (with Split Bench Seat)
CalloutComponent Name
1Rear Seat Belt Buckle Bolt CAUTION: Refer to Fastener Caution . Procedure Disengage the bottom of the rear seat back cover to access the bolt. Tighten 40 N.m (30 lb ft)
2Rear Seat Belt Buckle
CAUTION
Refer to Fastener Caution .

Rear Seat Center Buckle Side Belt Replacement (with Split Bench Seat)

Scheme 6

Scheme 6: Seat Belt Side Buckle Replacement - Rear (with Split Bench Seat)
Scheme 6: Seat Belt Side Buckle Replacement - Rear (with Split Bench Seat)
CalloutComponent Name
Preliminary Procedure Remove the rear seat cushion cover and pad. Refer to Rear Seat Cushion Cover and Pad Replacement .
1Rear Seat Belt Buckle Bolt CAUTION: Refer to Fastener Caution . Tighten 40 N.m (30 lb ft)
2Rear Seat Belt Buckle
CAUTION
Refer to Fastener Caution .

Seat Belt Side Buckle Replacement - Rear (with Split Bench Seat)

  1. Partially remove the seat cushion cover in order to gain access to the seat belt/buckle retaining bolt.
  2. Remove the seat belt/buckle retaining bolt from the seat frame.
  3. Remove the seat belt/buckle from the seat frame.
  1. Install the seat belt/buckle to the seat frame.
  2. Install the seat belt/buckle retaining bolt to the seat frame and tighten to 52 N.m (38 lb ft).
  3. Install the seat cushion cover to the seat frame.

Scheme 7

Scheme 7: Seat Belt Replacement - Center Rear (with Split Bench)
Scheme 7: Seat Belt Replacement - Center Rear (with Split Bench)
CalloutComponent Name
Preliminary Procedures Remove the rear seat. Refer to Rear Bench Seat Removal and Installation . Remove the rear back cushion cover and pad. Refer to Rear Seat Back Cushion Cover and Pad Replacement . Remove the rear cushion cover and pad. Refer to Rear Seat Cushion Cover and Pad Replacement .
1Rear Seat Shoulder Belt Retainer (Qty: 2)
2Rear Seat Should Belt Cover Bolt (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
3Rear Seat Should Belt Cover
4Rear Seat Shoulder Belt Nut Tighten 52 N.m (48 lb ft)
5Rear Seat Shoulder Belt Anchor Bolt Tighten 52 N.m (48 lb ft)
6Rear Seat Shoulder Belt Assembly
CAUTION
Refer to Fastener Caution .

Seat Belt Replacement - Center Rear (with Split Bench)

  1. Using a flat bladed tool, remove the shoulder/seat belt guide to the guide trim cover (1).
  2. Remove the bolt retaining the shoulder/seat belt guide to the guide adjuster.
  3. Remove the shoulder/seat belt guide from the guide adjuster.
  4. Remove the front door upper pillar garnish molding. Refer to «Upper Pillar Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  5. Remove the shoulder/seat belt guide adjuster retaining bolts from the pillar.
  6. Remove the shoulder/seat belt guide adjuster from the vehicle.
  1. Install the shoulder/seat belt guide adjuster to the vehicle.
  2. Install the shoulder/seat belt guide adjuster retaining bolts to the pillar and tighten to 26 N.m (19 lb ft).
  3. Install the shoulder/seat belt guide to the guide adjuster.
  4. Install the shoulder/seat belt guide retaining bolt to the guide adjuster and tighten to 52 N.m (38 lb ft).
  5. Install the front door upper pillar garnish molding. Refer to «Upper Pillar Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Install the shoulder/seat belt guide to the guide adjuster cover (1).
  1. Using a flat bladed tool, remove the shoulder/seat belt guide adjuster cover (1).
  2. Remove the shoulder/seat belt guide retaining bolt from the shoulder belt guide adjuster.
  3. Remove the shoulder/seat belt guide from the shoulder belt guide adjuster.
  4. Remove the front door upper pillar garnish molding. Refer to «Upper Pillar Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  5. Remove the front door lower pillar garnish molding. Refer to «Lower Pillar Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Disengage the front seat belt retractor guide (4) from the pillar.
  7. Remove the shoulder/seat belt retractor bolt (2) from the lower pillar.
  8. Remove the shoulder/seat belt retractor (1) assembly from the vehicle.
  1. Install the shoulder/seat belt retractor assembly to the vehicle.
  2. Install the shoulder/seat belt retractor retaining bolt to the lower pillar and tighten to 52 N.m (38 lb ft).
  3. Install the front door lower pillar garnish molding. Refer to «Lower Pillar Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  4. Install the front door upper pillar garnish molding. Refer to «Upper Pillar Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  5. Install the shoulder/seat belt guide to the shoulder belt guide adjuster.
  6. Install the upper shoulder/seat belt guide retaining bolt to the vehicle and tighten to 10 N.m (89 lb in).
  7. Install the shoulder/seat belt guide to the guide adjuster cover (1).
  1. Remove the center seat belt retractor seat belt opening trim (1).
  2. Remove the center seat belt retractor trim cover bolt (1).
  3. Remove the center seat belt retractor trim cover (2).
  4. Carefully pull the rear seat back trim down enough to expose the center seat belt retractor bolt.
  5. Remove the seat belt center retractor bolt.
  6. Slide the center seat belt retractor up and out of the key hole slots on the seat back frame.
  7. Partially remove the seat cushion cover (1) in order to gain access to the center seat belt retractor lower bolt (2).
  8. Remove the center seat belt retractor lower bolt (2).
  9. Remove the center seat belt retractor assembly from the vehicle.
  1. Install the center seat belt lower belt (3) to the seat cushion frame.
  2. Install the center seat belt retractor lower bolt (2) and tighten to 52 N.m (38 lb ft).
  3. Install the seat cushion cover (1).
  4. Slide the center seat belt retractor into key hole slots in the seat back frame.
  5. Carefully pull the rear seat back trim down enough to expose the center seat belt retractor bolt hole.
  6. Install the center seat belt retractor bolt and tighten to 52 N.m (38 lb ft).
  7. Install the center seat belt retractor trim cover (2).
  8. Install the center seat belt retractor trim cover bolt (1) and tighten to 1.5 N.m (13 lb in).
  9. Install the center seat belt retractor seat belt opening trim (1).
  1. Remove the seat belt upper trim cover retainers (2).
  2. Remove the seat belt upper trim cover (1)
  3. Remove the upper seat belt guide retaining bolt from the seat belt guide.
  4. Remove the upper seat belt guide from the vehicle.
  5. Remove the body side trim panel. Refer to «Body Side Trim Panel Replacement - Left Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Remove the seat belt retractor retaining bolt from the vehicle.
  7. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  3. Install the seat belt guide to the vehicle.
  4. Install the seat belt guide retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  5. Install the body side trim panel. Refer to «Body Side Trim Panel Replacement - Left Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Install the seat belt upper trim cover retainers (2).
  7. Install the seat belt upper trim cover (1)
  1. Remove the upper seat belt trim cover.
  2. Remove the body side trim panel. Refer to «Body Side Trim Panel Replacement - Right Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  3. Remove the upper seat belt guide retaining bolt from the seat belt guide.
  4. Remove the upper seat belt guide from the vehicle.
  5. Remove the seat belt retractor retaining bolt from the vehicle.
  6. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  3. Install the seat belt guide to the vehicle.
  4. Install the seat belt guide retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  5. Install the body side trim panel. Refer to «Body Side Trim Panel Replacement - Right Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Install the upper seat belt trim cover.
  1. Remove the seat belt upper trim cover retainers (2).
  2. Remove the seat belt upper trim cover (1).
  3. Remove the upper seat belt guide retaining bolt from the seat belt guide.
  4. Remove the upper seat belt guide from the vehicle.
  5. Remove the body side trim panel. Refer to «Body Side Trim Panel Replacement - Left Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Remove the seat belt retractor retaining bolt from the vehicle.
  7. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  3. Install the seat belt guide to the vehicle.
  4. Install the seat belt guide retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  5. Install the body side trim panel. Refer to «Body Side Trim Panel Replacement - Left Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Install the seat belt upper trim cover retainers (2).
  7. Install the seat belt upper trim cover (1).
  1. Remove the upper seat belt trim cover retainers (2).
  2. Remove the seat belt trim cover (1)
  3. Remove the upper seat belt guide retaining bolt from the seat belt guide.
  4. Remove the upper seat belt guide from the vehicle.
  5. Remove the body side trim panel. Refer to «Body Side Trim Panel Replacement - Right Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Remove the seat belt retractor retaining bolt from the vehicle.
  7. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  3. Install the seat belt guide to the vehicle.
  4. Install the seat belt guide retaining bolt to the vehicle and tighten to 52 N.m (38 lb ft).
  5. Install the body side trim panel. Refer to «Body Side Trim Panel Replacement - Right Side»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  6. Install the upper seat belt trim cover (1).
  7. Install the upper seat belt trim cover retainers (2).
  1. Remove the seat belt escutcheon from the rear corner garnish molding.
  2. Remove the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  3. Remove the seat belt retractor retaining bolts from the seat belt retractor.
  4. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor retaining bolts to the vehicle. Tighten the seat belt retractor upper retaining bolt to 52 N.m (38 lb ft). Tighten the seat belt retractor lower retaining bolt to 10 N.m (89 lb in).
  3. Install the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  4. Secure the seat belt escutcheon to the rear corner garnish molding.
  1. Remove the seat belt escutcheon from the rear corner garnish molding.
  2. Remove the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  3. Remove the seat belt retractor retaining bolts from the seat belt retractor.
  4. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor retaining bolts to the vehicle. Tighten the seat belt retractor upper retaining bolt to 52 N.m (38 lb ft). Tighten the seat belt retractor lower retaining bolt to 10 N.m (89 lb in).
  3. Install the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  4. Secure the seat belt escutcheon to the rear corner garnish molding.
  1. Remove the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  2. Remove the seat belt retractor bolts (1) from the seat belt retractor.
  3. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor bolts (1) to the vehicle and tighten to 52 N.m (38 lb ft).
  3. Install the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  1. Remove the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  2. Remove the seat belt retractor bolts (1).
  3. Remove the seat belt retractor from the vehicle.
  1. Install the seat belt retractor to the vehicle.
  2. Install the seat belt retractor bolts (1) and tighten to 52 N.m (38 lb ft).
  3. Install the rear corner garnish molding. Refer to «Body Rear Corner Garnish Molding Replacement»(/chevrolet/express-g3500/2013-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .

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 Supplemental Inflatable Restraint System Description and Operation for a description of the seat belt retractor pretensioner.

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 retractor 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 in the passenger ON/OFF indicator. Both indicators are controlled by the IPC at the request of the inflatable restraint sensing and diagnostic module (SDM). The driver indicator, 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.