LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (HVAC Systems - Automatic) >> Symptom Tests >> Test D: Blower Motor Always On

Test D: Blower Motor Always On

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. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing system check, go to next step.
  2. Turn ignition on, engine off. Turn off all HVAC controls. If Blower Motor operates, go to next step. If Blower Motor does not operate, inspect for intermittent loose wires or poor connectors to blower. See INTERMITTENTS  under TROUBLE SHOOTING. Repair any damage or loose connections found.
  3. Connect scan tool. Observe COMMAND BLOWER parameter in INSTRUMENT PANEL MODULE data list. If scan tool indicates COMMAND BLOWER parameter is near zero percent, go to step  5. If scan tool indicates COMMAND BLOWER parameter is not near zero percent, go to next step.
  4. Use scan tool to perform, COMMAND BLOWER MOTOR OFF. Observe COMMANDED BLOWER parameter. If scan tool indicates COMMAND BLOWER parameter is near zero percent, go to step  7. If scan tool indicates COMMAND BLOWER parameter is not near zero percent, go to step  8.
  5. Disconnect IPM. If Blower Motor continues to operate, go to next step. If Blower Motor does not continue to operate, go to step  8.
  6. Inspect Blower Motor Control Processor harness connectors for loose wires and/or poor connections. If poor connection is found, repair as necessary. Go to step  12. If poor connection is not found, go to step  9.
  7. Inspect HVAC Control Module harness connectors for loose wires and/or poor connections. If poor connection is found, repair as necessary. Go to step  12. If poor connection is found, go to step  10.
  8. Check for loose wires and/or poor connections to Instrument Panel Module (IPM) harness connector. If poor connection is found, repair as necessary. Go to step  12. If poor connection is not found, go to step  11.
  9. Replace Blower Motor Control Processor. See BLOWER MOTOR CONTROL PROCESSOR  under REMOVAL & INSTALLATION. Go to step  12.
  10. Replace HVAC Control Module. See HVAC CONTROL MODULE  under REMOVAL & INSTALLATION. Go to step  12.
  11. Replace IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. Go to step  12.
  12. Operate system to verify repair. If condition is corrected, system is okay. If condition is not corrected, go to step  2.
scientia non olet · About LEMON Manuals