Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1677 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0074CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban C2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The passenger presence sensor is not serviced separately. The PPS replacement with the passenger presence sensor must be serviced as a complete unit.
- When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:
- Passenger presence sensor
- PPS module
- Passenger presence sensor wiring harness connector
- PPS module wiring harness connector
- Ignition OFF, disconnect the harness connector at the passenger presence module and inspect the component and harness sides for damage or corrosion.
- If damage or corrosion is found, repair or replace as necessary.
- Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal 1 and ground.
- If less that the specified range, test the voltage reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the PPS module.
- If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the PPS module.
- Ignition OFF, remove the AIR BAG BATT Fuse. Test for less than 2.0 ohms between low reference terminal 4 and ground.
- If greater than the specified range, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the PPS module.
- Ignition OFF, disconnect the harness connector at the PPS module.
- Test for infinite resistance between the signal circuit terminal 6 and ground.
- If less than the specified value, test the signal circuit for a short to ground.
- Ignition ON, test for less than 1 volt between the signal circuit terminal 2 and ground.
- If greater than the specified range, test the signal circuit for a short to voltage.
- If all circuits test normal, replace the PPS module which includes the pressure sensor.
IMPORTANT:
IMPORTANT:
The AIR BAG BATT Fuse that supplies B+ voltage must be removed to ensure the PPS module is inactive. An active PPS module may cause inaccurate resistance readings.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.