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 C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1677 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0091CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C1500, 5.3 Z
Circuit/System Testing
2006 Chevrolet Suburban C1500, 5.3 ZSECTION 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.
- Front end sensor
- SDM module
- Front end sensor wiring harness connector
- SDM wiring harness connector
- Ignition OFF, disconnect the harness connector at the front end sensor and the SDM X2.
- Ignition ON, test for less than 1 V between the front end sensor signal circuit terminal 1 and ground.
- If greater than the specified range, test the signal circuit for a short to voltage.
- Ignition ON, test for less than 1 V between the front end sensor low reference circuit terminal 2 and ground.
- If greater than the specified range, test the low reference circuit for a short to voltage.
- Test for infinite resistance between the front end sensor signal circuit terminal 1 and ground.
- If less than the specified value, test the signal circuit for a short to ground.
- Test for infinite resistance between the front end sensor low reference circuit terminal 2 and ground.
- If less than the specified value, test the low reference circuit for a short to ground.
- Test for less than 1 Ξ© between the SDM signal circuit terminal 23 X2 and the front end sensor circuit terminal 1 harness connector.
- If greater than the specified range, test the signal circuit for an open/high resistance.
- Test for less than 1 Ξ© between the SDM low reference circuit terminal 24 X2 and the front end sensor circuit terminal 2 harness connector.
- If greater than the specified range, test the low reference circuit for an open/high resistance.
- If all circuits test normal, test or replace the front end sensor.
- Reconnect all SIR components. Ignition ON, verify the DTC is not set as current.
- If the DTC resets as current, replace the SDM.
NOTE:
When removing the connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.