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 MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 31 (HVAC SYSTEMS - MANUAL)SELF-DIAGNOSTICS SYSTEMDIAGNOSTIC SYSTEM CHECK
2004 Oldsmobile Bravada AWD
Diagnostic System Check
2004 Oldsmobile Bravada AWDSECTION Diagnostic System Check
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Did you review DESCRIPTION & OPERATION? If so, go to next step. If not, go to DESCRIPTION & OPERATION .
- Install a scan tool. Does the scan tool power up? If so, go to next step. If not, see SCAN TOOL DOES NOT POWER UP in DATA LINK COMMUNICATIONS.
- Turn ignition on. Attempt to establish communication with the Powertrain Control Module (PCM). Does the scan tool communicate with the PCM? If so, go to next step. If not, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in DATA LINK COMMUNICATIONS.
- Select the PCM display DTCs function on the scan tool. Does the scan tool display any DTCs? If so, go to next step. If not, go to SYMPTOM DIAGNOSIS under TROUBLE SHOOTING.
- Does the scan tool display any DTCs which begin with a "U"? If so, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in DATA LINK COMMUNICATIONS. If not, go to next step.
- Does the scan tool display any DTCs which begin with a "P" that are associated with the HVAC system? If so, go to DIAGNOSTIC TESTS . If not, see appropriate SELF-DIAGNOSTIC article in ENGINE PERFORMANCE.
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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.