Seat Belt System Cadillac Escalade GMT900

Fastener Tightening Specifications

Scheme 1

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»(/cadillac/escalade/gmt900-2006-2014/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.

For information on removal of the rear seats cushions, refer to Rear Seat Cushion Cover and Pad Replacement (Tahoe/Yukon/Escalade with Split Bench) or Rear Seat Cushion Cover and Pad Replacement (Avalanche/Escalade EXT) or Rear Seat Cushion Cover and Pad Replacement (Tahoe/Yukon/Escalade with Bucket) .

Emergency Locking Retractors

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»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) «Seat Belt Retractor Replacement - No. 1 Rear (Avalanche/Escalade EXT)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) or «Seat Belt Retractor Replacement - No. 1 Rear (Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) or «Seat Belt Retractor Replacement - No. 1 Rear (Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) «Rear Seat Center Retractor Side Belt Replacement (Split Bench)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) «Seat Belt Retractor Replacement - No. 2 Rear»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)

Symptoms - Seat Belts

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the seat belt system. Refer to «Checking Aftermarket Accessories»(/cadillac/escalade/gmt900-2006-2014/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 Circuit Malfunction - Driver»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) in order to diagnose the symptom.
2. Refer to «Seat Belt Indicator Circuit Malfunction - Passenger»(/cadillac/escalade/gmt900-2006-2014/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»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

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»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)
2. «SIR Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)

Connector End View Reference

Component Connector End Views

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__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

1. Ignition OFF, disconnect the harness connector at the seat belt switch.
2. Test the resistance between the low reference circuit terminal B and signal circuit terminal A of the switch (buckle side) while connecting and disconnecting the seat belt. The resistance should switch between infinity and less than 2 ohms.
3. Ignition ON, using a scan tool, verify the SDM Driver Seat Belt Switch parameter display is Buckled. If the parameter is Unbuckled, test the seat belt switch signal circuit for a short to ground. If the circuit tests normal replace the SDM.
4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the SDM Driver Seat Belt Switch parameter display is Unbuckled. If the parameter is Buckled, test the signal and the low reference circuits for open/high resistance or a short to voltage. If the circuits test normal, replace the SDM.
5. If all circuits test normal, test or replace the seat belt switch.

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 (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) or «Driver or Passenger Seat Belt Buckle Replacement (without HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/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»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The seat belt buckle 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. When the passenger presence system (PPS) indicates that the seat is occupied, the SDM sends the status of the passenger seat belt via serial data to the instrument panel cluster (IPC). After receiving the message, the IPC controls the illumination of the passenger seat belt indicator by grounding the indicator control circuit. If an occupant is seated in the front passenger seat and the seat belt is unfastened, the SDM will send a message to the IPC to illuminate the fasten seat belt indicator for approximately 72 seconds or until the seat belt is fastened.

Schematic Reference

1. «Seat Belt Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)
2. «SIR Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)

Connector End View Reference

Component Connector End Views

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

1. With no weight in the passenger seat observe the passenger seat belt status indicator. Turn ON the ignition, the indicator should illuminate for 5 seconds. If the indicator is always ON or always OFF, refer to Indicator Circuit Test.
2. Ignition ON, monitor the Passenger Seat Belt Switch parameter while connecting and disconnecting the seat belt. The parameter should display Buckled and Unbuckled when changing seat belt states. If the parameter displays incorrectly, refer to Switch Circuit Test.

Indicator Circuit Test

1. Ignition OFF, disconnect the harness connector at the inflatable restraint passenger air bag ON/OFF indicator.
2. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 4 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the inflatable restraint passenger air bag ON/OFF indicator.
3. Connect a test lamp between the control circuit terminal 5 and the ignition circuit terminal 4.
4. With the passenger seat occupied the test lamp should turn ON with the seat belt disconnected, and turn OFF with the seat belt connected. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the IPC. If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the IPC.
5. If the circuits test normal, replace the inflatable restraint passenger air bag ON/OFF indicator.

Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the seat belt switch.
2. Test the resistance between the low reference circuit terminal B X1 and signal circuit terminal A X1 of the switch (buckle side) while connecting and disconnecting the seat belt. The resistance should switch between infinity and less than 2 ohms. If not as specified, replace the seat belt buckle.
3. Ignition ON, using a scan tool, verify the Passenger Seat Belt Switch parameter display is Buckled. If the parameter is Unbuckled, test the seat belt switch signal circuit for a short to ground. If the circuit tests normal replace the SDM.
4. Install a 3-amp 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 display is Unbuckled. If the parameter is Buckled, test the signal and the low reference circuits for open/high resistance. If the circuits test normal, replace the SDM.

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 X1 and the low reference terminal B X1. If not the specified range, replace the seat belt switch.
3. With the seat belt unbuckled, test for less than 2 ohms between the signal circuit terminal A X1 and the low reference terminal B X1. If greater than the specified range, replace the seat belt switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Driver or Passenger Seat Belt Buckle Replacement (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) or «Driver or Passenger Seat Belt Buckle Replacement (without HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)
2. «Inflatable Restraint Instrument Panel Module Indicator Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
3. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM or IPC replacement, setup, and programming

Seat Belt Service Precautions

1. Do not bleach or dye the seat belt webbing. Use only the following items in order to clean the seat belt webbing: A mild soap and water solution A soft brush or cloth
2. Keep sharp edges and damaging objects away from the seat belts. Do not bend or damage any part of the seat belt buckle or the latch plate. Replace any seat belts that are cut or damaged in any manner.
3. Use only the correct seat belt anchor nuts/bolts. Tighten the correct seat belt anchor nut/bolt/screw to the correct torque value. Refer to «Fastener Tightening Specifications»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system__fastener-tightening-specifications) .
4. Some seat belts and retractors require service as a set with service replacement components only. Do not repair individual components that must require service as a set.
5. 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

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 4

Scheme 5

Scheme 6

Rear Seat Buckle Side Belt Replacement (Split Bench)

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

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.

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 (Tahoe/Yukon/Escalade with Split Bench)
• Seat Belt Retractor Pretensioner Replacement - Front
• 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
• Front Side Door Sill Trim Plate Replacement
• SIR Disabling and Enabling
• Rear Seat Number 2 Hinge Finish Cover Replacement
• Repairs and Inspections Required After a Collision
• Seat Belt Does Not Retract
• Seat Belt Retractor Replacement - No. 1 Rear (Avalanche/Escalade EXT)
• Fastener Tightening Specifications
• Symptoms - Seat Belts