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 87 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1370CIRCUIT/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 2009 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
- SDM module
- SDM wiring harness connector
- Ignition OFF, remove the AIR BAG fuse from the BCM fuse center. Ignition ON, engine OFF, test for 9-16 volts between the voltage supply side of the fuse and ground.
- If not within the specific range, refer to DTC B1370 .
- Disconnect the SDM harness connector.
- Disconnect the BCM harness connector X3.
- Ignition OFF, test for less than 1 ohm between the BCM ignition 1 voltage circuit terminal D7 X3 and the SDM terminal 33.
- If greater then the specified range, test the circuit for an open/high resistance.
- Test for infinite resistance between the SDM ignition 1 voltage circuit terminal 33 and ground.
- If less than the specified range, test the circuit for short to ground.
- Ignition ON, test for less than 1 volt between the SDM ignition 1 voltage circuit terminal 33 and ground.
- If greater then the specified value, test the circuit for a short to voltage.
- If all circuits test normal then replace the SDM.
IMPORTANT:
When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
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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.