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 MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 19 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC TESTSSIR DIAGNOSTIC SYSTEM CHECKDIAGNOSTIC PROCEDURE
2001 Chevrolet Cavalier LS, 2.4 T
Diagnostic Procedure
2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2000 Pontiac Sunfire and 2000 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
- Observe AIR BAG warning light while turning ignition switch to RUN position. If AIR BAG warning light flashes 7 times and goes off, go to next step. If AIR BAG warning light does not function as described, go to AIR BAG WARNING LIGHT CIRCUIT MALFUNCTION .
- Turn ignition on. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, inspect Data Link Connector (DLC) and circuits. Scan tool should receive battery power at terminal No. 16 with a ground connection at terminal No. 4. Class 2 serial data signal should be received at terminal No. 2 and be grounded at terminal No. 5. See Figure. When scan tool powers up, go to next step.
- Using scan tool, establish communication with SDM. If scan tool communicates with SDM, go to next step. If scan tool does not communicate with SDM, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE .
- Using scan tool, request SIR DTC display. If scan tool displays DTCs go to next step. If scan tool does not display any DTCs, system is functioning normally.
- If DTCs begin with "U", go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE . If scan tool displays DTCs that do not begin with "U", go to next step.
- If scan tool displays DTC B1000, check for ECU malfunction in Body Control System. If scan tool displays other DTCs, refer to DIAGNOSTIC TROUBLE CODE (DTC) CHART table.
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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.