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8A-8 Seat Belts:
Static Test Seat Belts with Child Hold-Out
Mechanism (CHOM) Feature
Front Passenger Seat, Rear Outboard Seats
1. Pull the seat belts all the way out of the retractor.
2. Feed a few inches of belt back into the retractor and
listen for the audible clicking of the child hold-out
mechanism (CHOM) system.
3. Verify that the belt cannot be pulled out of the
retractor.
4. Feed the seat belt all of the way into the retractor
and verify that the belt returns to normal operating
conditions.
If the seat belt webbing will not retract, refer to "Seat
Belt Does Not Retract".
Safety Belt Operational Checks
Front and Rear Restraints
The front seats and rear seats have a three-point seat
belt system with a seat belt retractor. The rear seat latch
plate should move up and down easily on the belt. An
audible click should be heard when the front or rear latch
plate is inserted into the buckle. Inspect the attachment
of the latch plate to the buckle by grasping the belt and
pulling firmly. The belt should disconnect easily when the
button on the buckle is pushed in.
Symptoms - Seat Belts
NOTE
Review 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
• Inspect for aftermarket devices which could affect the
operation of the seat belt system. Refer to "Checking
Aftermarket Accessories: ".
• 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
• Refer to "Seat Belt Indicator Circuit Malfunction -
Driver" in order to diagnose the symptom.
• Refer to "Seat Belt Indicator Circuit Malfunction -
Passenger: " 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.
Seat Belt Indicator Circuit Malfunction -
Driver
Diagnostic Fault Information
Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
Circuit/System Description
The inflatable restraint sensing and diagnostic module
(SDM) sends the status of the driver seat belt switch to
the instrument panel cluster (IPC) via a GMLAN serial
data message. If the seat belt is unfastened, the SDM
will send a message to the IPC to illuminate the fasten
safety belt indicator for 72 seconds or until the seat belt
is fastened.
Reference Information
Schematic Reference
• "Seat Belt Schematics"
• "SIR Schematics: "
Connector End View Reference
"Seat Belt Connector End Views"
Description and Operation
"Seat Belt System Description and Operation"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Data List - SIR: "
• "Scan Tool Data Definitions - SIR: "
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Troubleshooting
