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 MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 610 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0090CIRCUIT/SYSTEM TESTING
2008 Chevrolet HHR LT, 2.4 P, Automatic
Circuit/System Testing
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2011 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
Refer to SIR Service PrecautionsΒ .
NOTE:
When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
- Vehicle rollover sensor
- SDM
- Vehicle rollover sensor wiring harness connector
- SDM wiring harness connector
- Ignition OFF, disconnect the harness connector at the rollover sensor and the SDM.
- Test for less than 5 Ξ© between the rollover sensor ground circuit terminal 6 and ground.
- If greater then the specified range, test the ground circuit for an open/high resistance.
- Test for greater then 5 Ξ© between the rollover sensor serial data circuit terminal 5 and ground.
- If less than the specified range, test the serial data circuit for a short to ground.
- Ignition ON, test for less than 1 V between the rollover sensor serial data circuit terminal 5 and ground.
- If greater then the specified range, test the serial data circuit for a short to voltage.
- Test for less than 5 Ξ© between the rollover sensor serial data circuit terminal 5 and the SDM occupant sensor serial data circuit terminal 60.
- If greater then the specified range, test the serial data circuit for an open/high resistance.
- Verify that a test lamp illuminates between the ignition 1 circuit terminal 1 and ground.
- If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit fuse is open, test the circuit for a short to ground, if the circuit tests normal, replace the rollover sensor.
- With a scan tool, clear DTCs. Verify DTC B0090 is not set.
- If the DTC is set, replace the SDM.
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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.