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Test C: Blower Motor Inoperative

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. Set blower motor switch in each speed position. If blower motor does not operate in any speed position, go to next step. If blower motor operates in any speed position, go to TEST D: BLOWER MOTOR MALFUNCTION .
  3. Turn ignition off. Disconnect blower motor harness connector. Turn ignition on. Using test light connected to ground, probe blower motor harness connector terminal "A". See WIRING DIAGRAMS . If test light illuminates, go to next step. If test light does not illuminate, go to step  6.
  4. Connect test light between blower motor harness connector terminals. If test light illuminates, go to step  8. If test light does not illuminate, go to next step.
  5. Check Black wire between ground and blower motor harness connector terminal "B" for open or high resistance. Repair Black wire as necessary. After repair, go to step  16. If wire is okay, go to step  9.
  6. Turn ignition off. Disconnect blower motor resistor harness connector. Turn ignition on. Set blower motor switch to minimum speed position. Using test light connected to ground, probe blower motor resistor harness connector terminal "B" (Yellow wire). If test light illuminates, go to step  9. If test light does not illuminate, go to next step.
  7. Turn ignition off. Disconnect HVAC control panel harness connectors. Turn ignition on. Using test light connected to ground, probe ignition voltage circuit of blower motor switch. If test light illuminates, go to step  11. If test light does not illuminate, go to step  12.
  8. 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.
  9. Visually inspect wiring harness between blower motor and blower motor resistor for open or damage. Repair wiring harness as necessary. After repair, go to step  16. If wiring harness is okay, go to next step.
  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 open or high resistance in ignition voltage circuit of blower motor switch. 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.
Fig 1: Identifying A/C-Heater Control Panel Black 12-Pin Harness Connector C2 Terminals
G98C03052Courtesy of GENERAL MOTORS CORP.
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