Silverado 3500 2WD V8-6.0L VIN U (2004)
Seat Belt Reminder Lamp: Description and Operation
FASTEN SAFETY BELT INDICATOR
The fasten safety belt indicator may only be illuminated during RUN. The instrument panel cluster (IPC) illuminates the fasten safety belt indicator under
the following conditions:
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During bulb check.
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The inflatable restraint sensing and diagnostic module (SDM) sends the status of the driver's seat belt switch to the IPC via a class 2 message. If
the driver's seat belt is unfastened, the IPC will illuminate the fasten safety belt indicator for 72 seconds or until the driver's seat belt is fastened. If
the driver's seat belt is unfastened within 8 seconds following the bulb check, the IPC will send a class 2 serial message requesting 5 chimes to
sound.
