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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 25 (HVAC SYSTEMS - AUTOMATIC)SELF-DIAGNOSTIC SYSTEMDIAGNOSTIC SYSTEM CHECK
2004 Oldsmobile Bravada RWD

Diagnostic System Check

2004 Oldsmobile Bravada RWDSECTION Diagnostic System Check
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you review DESCRIPTION & OPERATION? If so, go to next step. If not, go to DESCRIPTION & OPERATION  then, go to next step.
  2. Install a scan tool. Does the scan tool power up? If so, go to step  4. If not see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
    3. NOTE: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
  3. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool. Rotate the ignition switch through all positions while observing the ignition switch power mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions? If so go to next step. If not see TEST C: POWER MODE MISMATCH under SYSTEM TESTS in BODY CONTROL MODULES - AURORA article in ACCESSORIES & EQUIPMENT.
  4. Turn ON the ignition, with the engine OFF. Attempt to establish communication with the following control modules:
    • Driver Door Module
    • Powertrain Control Module
    • Instrument Panel Module
    • Dash Integration Module
    Does the scan tool communicate with the control modules? If so, go to next step. If not, see Scan Tool does not communicate with class 2 device in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  5. Select the display DTCs function on the scan tool for the following control modules:
    • Driver Door Module
    • Powertrain Control Module
    • Instrument Panel Module
    • Dash Integration Module
    Does the scan tool display any DTCs? If so go to next step. If not, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
  6. Does the scan tool display any DTCs which begin with a "U"? If so, see Scan Tool does not communicate with class 2 device in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If not, go to next step.
  7. Does the scan tool display DTC B10XX, except B1000? If so, see DIAGNOSTIC TROUBLE CODE INDEX . If not, go to next step
  8. Does the scan tool display DTC B1327? If so, see DIAGNOSTIC TROUBLE CODE INDEX  table. If not, go to next step.
  9. Does the scan tool display any DTCs which are not associated with the HVAC system? If so, see DIAGNOSTIC TROUBLE CODE DEFINITIONS under BODY CONTROL MODULES in COMMUNICATION DEVICES. If not, see DIAGNOSTIC TROUBLE CODE DEFINITION  table.
RENDER: 1.0x

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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.