LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (HVAC Systems - Manual) >> Symptom Tests >> Test E: Blower Motor Malfunction

Test E: Blower Motor Malfunction

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit reference, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS  .
NOTE: Definition: The blower motor operates in at least one, but not all, speed positions.
  1. If diagnostic system test has been performed, go to next step. If diagnostic system check has not been performed, go to DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on. Place mode switch in VENT position. Turn blower switch to each speed position. If blower motor operates at correct speed in each speed position, go to next step. If blower motor does not operate at correct speed in each speed position, go to step  4.
  3. Place blower motor switch at maximum speed position. Place mode switch in each position. If blower operates in each mode switch position, problem is intermittent. Check for faulty wiring, poor connections or damaged components, and repair as necessary. If repair is complete, go to step  24. If an intermittent condition was not found, go to step  18.
  4. Turn ignition off. Disconnect blower motor harness connector. Turn ignition on. Using a test light connected to ground, probe blower motor harness connector terminal No. "B" (Purple wire). Place blower motor switch in each speed position. If test light illuminates in all speed positions, go to step  16. If test light does not illuminate in each speed position, go to next step.
  5. If test light illuminates in maximum speed position, go to step  10. If test light does not illuminate in maximum speed position, go to next step.
  6. Turn ignition off. Disconnect blower motor relay. Turn ignition on. Using a test light connected to ground, probe blower motor relay harness connector terminal No. A2 (Red wire). See WIRING DIAGRAMS . If test light illuminates, go to next step. If test light does not illuminate, go to step  19.
  7. Place blower motor switch in maximum speed position. Using a test light connected to ground, probe blower motor relay harness connector terminal No. A1 (Orange wire). If test light illuminates, go to step  9. If test light does not illuminate, go to next step.
  8. Check high speed blower circuit (Orange wire) between blower motor relay harness connector terminal No. A1 and HVAC control assembly harness connector C1, terminal "B" for an open or high resistance. See Figure. If an open or high resistance was found, repair as necessary and go to step  24. If wire is okay, go to step  14.
  9. Check blower motor relay ground circuit (Black wire) for an open or high resistance between blower motor relay harness connector terminal No. C2 and ground. If an open or high resistance was found, repair as necessary and go to step  24. If wire is okay, go to step  15.
  10. Turn ignition off. Disconnect blower motor relay. Turn ignition on. Using a test light connected to ground, probe blower motor resistor harness connector terminal No. "C" (Dark Blue wire). See Figure. Alternately place blower motor switch in LOW, M1 (medium-low) and M2 (medium-high) speed positions. If test light illuminates in each speed position, go to step  15. If test light does not illuminate in each speed position, go to next step.
  11. Check blower motor voltage supply circuit (Dark Blue wire) between blower motor relay harness connector terminal No. B2 and blower motor resistor harness connector terminal No. "C" for a short to ground, an open or high resistance. See WIRING DIAGRAMS . If a short to ground, an open or high resistance was found, repair as necessary and go to step  24. If circuit is okay, go to next step.
  12. Turn ignition off. Disconnect blower motor resistor harness connector. Turn ignition on. Place mode switch in VENT position. Using a test light connected to ground, individually probe blower motor resistor harness connector terminals "A" (Tan wire), "B" (Yellow wire) and "D" (Light Blue wire). See WIRING DIAGRAMS . Place blower motor switch in appropriate speed position corresponding to wire being tested. If test light illuminates in each switch position, go to step  17. If test light does not illuminate in each switch position, go to next step.
  13. Check suspect blower motor control circuit identified in previous step for an open or high resistance. If an open or high resistance was found, repair suspect wire as necessary and go to step  24. If wire is okay, go to step  18.
  14. Check Light Green wire between HVAC control assembly harness connector C2 terminal "B" and HVAC control assembly connector C1 terminal "E" for an open or high resistance. See Figure and WIRING DIAGRAMS  . If an open or high resistance was found, repair as necessary and go to step  24. If wire is okay, go to step  18.
  15. Check for poor connections or connector damage at blower motor relay. If a poor connection was found, repair as necessary and go to step  24. If connections are okay, go to step  20.
  16. Check for poor connections or connector damage at blower motor. If a poor connection was found, repair as necessary and go to step  24. If connections are okay, go to step  21.
  17. Check for poor connections or connector damage at blower motor resistor. If a poor connection was found, repair as necessary and go to step  24. If connections are okay, go to step  22.
  18. Check for poor connections or connector damage at HVAC control assembly harness connectors. If a poor connection was found, repair as necessary and go to step  24. If connections are okay, go to step  23.
  19. Repair open in Red wire between blower motor relay harness connector and I/P-1 fuse (40-amp) in underhood fuse block. If repair is complete, go to step  24.
  20. Replace blower motor relay. See BLOWER MOTOR RELAY  under REMOVAL & INSTALLATION. After repairs are complete, go to step  24.
  21. Replace blower motor. See BLOWER MOTOR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  24.
  22. Replace blower motor resistor. See BLOWER MOTOR RESISTOR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  24.
  23. Replace HVAC control assembly. See HVAC CONTROL ASSEMBLY  under REMOVAL & INSTALLATION. If replacement is complete, go to next step.
  24. Operate blower system to verify repair. If blower motor operates normally, repair is complete. If blower motor still malfunctions, return to step  3.
scientia non olet · About LEMON Manuals