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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBUICK2006TERRAZA CXL, 3.5 L, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 246 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0021CIRCUIT/SYSTEM TESTING
2006 Buick Terraza CXL, 3.5 L, AWD
Circuit/System Testing
2006 Buick Terraza CXL, 3.5 L, AWDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Chevrolet Monte Carlo and 2007 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- The side impact module - RF
- The side impact module wiring harness
- The SDM module
- The side impact module - RF wiring harness connector
- The side impact module wiring harness connector
- The SDM wiring harness connector
- Ignition OFF, disconnect the side impact module - RF wiring harness connector located under the driver front seat.
- Connect the J 38715-A to the harness side of the side impact module - RF wiring harness connector. See Special Tools . Use the PASSENGER INFLATOR connector located on the load tool.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0021 is set history.
- If DTC B0021 is current turn OFF the ignition and remove the SDM connector. Refer to Control Module References for SDM replacement in Repair Instructions for connector location.
- Test and repair both side impact module - RF high and low circuits for a short to voltage, short to ground, or open/low resistance. If all circuits test normal then replace the SDM.
- Ignition OFF, disconnect and remove the J 38715-A . See Special Tools . Then connect the side impact module - RF wiring harness connector. Remove the side impact module - RF connector. Use J 38715-30A to connect the J 38715-A to the harness side of the side impact module - RF connector. See Special Tools . Use the PASSENGER INFLATOR connector located on the load tool.
- Ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0021 is set history.
- If DTC B0021 is current the replace the side impact module - RF wiring harness.
- If DTC B0021 is history replace the side impact module - RF.
IMPORTANT:
When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.