Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the B1148 GMC code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
When the ignition switch is turned to RUN position, Side Impact Sensing Module (SISM) will perform tests to diagnose critical internal malfunctions. The SISM then tests the deployment loop for an open, short to ground or ignition, high or low resistance, or reserve energy failure condition. SISM transmits a 300-millisecond, 50 percent duty cycle, pulse width modulated signal to Sensing and Diagnostic Module (SDM) over-circuit 2108 to indicate normal operation and no malfunctions. SISM communicates that it is turning off (ignition OFF) by sending a 20 millisecond, 50 percent duty cycle, pulse width modulated signal. The Diagnostic Trouble Code (DTC) sets when SDM receives a pulse width signal other than specified for normal operation, or no signal. SISM performs tests during POWER-ON, CONTINUOUS MONITORING, and asynchronously.
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