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Test D: Blower Motor Malfunction

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.
  1. If diagnostic system check was not performed, go to DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTICS SYSTEM. If diagnostic system check was performed, go to next step.
  2. Turn ignition on. Place blower motor switch in each speed position. If blower motor operates at selected speeds, Check wiring harness and connectors for poor connections. If problem is found, repair as necessary. If poor connection is not found, go to next step.
  3. Turn ignition off. Disconnect blower motor harness connector. Turn ignition on. Using test light connected to ground, probe blower harness connector terminal "A". See WIRING DIAGRAMS . Set blower motor speed control in each speed position. If test light illuminates in each speed position, go to step  7. If test light does not illuminate at each speed position, go to next step.
  4. Turn ignition off. Disconnect blower motor resistor harness connector. Turn ignition on. Using test light connected to ground, probe blower motor resistor harness connector terminal "G" (Orange wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  12.
    5. NOTE: Ensure blower motor control processor and HVAC control module connectors are connected before performing next step.
  5. Using test light connected to ground, probe A/C-heater control panel harness connector terminals "E" (Purple wire), "F" (Light Blue wire), "G" (Tan wire) and "H" (Yellow wire) while moving blower motor speed selector switch to each speed position. See WIRING DIAGRAMS . If test light illuminates at each corresponding speed position, go to step  10. If test light does not illuminate at each corresponding speed position, go to next step.
  6. Check suspect blower motor control circuit wire, causing test light to not illuminate, for open or high resistance. Repair wire as necessary. After repair, go to step  16. If suspect wire is okay, go to step  11.
  7. Connect test light between blower motor harness connector terminals. Set blower motor speed control in each speed position. If test light illuminates in each speed position, go to step  9. If test light does not illuminate in each speed position, go to next step.
  8. Check Black wire between blower motor resistor harness connector terminal "E" and ground for high resistance. Repair Black wire as necessary. After repair, go to step  16. If connections are okay, go to step  10.
  9. Check for poor connections or connector damage at blower motor harness connector. Repair or replace as necessary. After repair, go to step  16. If connections are okay, go to step  13.
  10. Check for poor connections or connector damage at blower motor resistor harness connector. Repair or replace as necessary. After repair, go to step  16. If connections are okay, go to step  14.
  11. Check for poor connections or connector damage at A/C-heater control panel harness connector. Repair or replace as necessary. After repair, go to step  16. If connections are okay, go to step  15.
  12. Repair Orange wire between blower motor resistor harness connector terminal "G" and HIGH BLOWER fuse (30-amp) located in instrument panel fuse block. After repair, go to step  16.
  13. Replace blower motor. See BLOWER MOTOR  under REMOVAL & INSTALLATION. After repair, go to step  16.
  14. Replace blower motor resistor. See BLOWER MOTOR RESISTOR  under REMOVAL & INSTALLATION. After repair, go to step  16.
  15. Replace HVAC control module. See HVAC CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, go to next step.
  16. Operate system to verify repair. If system operates normally, repair is complete. If system does not operate normally, return to step  2.
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