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Blower Motor Does Not Run In Any Mode

WARNING: This page is about a different car, the 1996 Buick Park Avenue and 1996 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect blower motor connector. Turn ignition switch to RUN position. Press defroster button. Adjust blower motor to high speed. Using voltmeter, measure voltage between blower motor connector terminal "A" (Purple wire) and ground. If less than battery voltage is present, go to step 3).
  2. If battery voltage is present, measure voltage between blower motor connector terminals. If less than battery voltage is present, check for open Black wire between blower motor and ground. Ensure ground connection is clean and tight. If battery voltage is present, check blower motor connector. If connector is okay, replace blower motor.
  3. Check for open or short to ground in Purple wire between blower motor control module, blower motor and fuse No. 11 (10-amp). If circuit No. 65 is okay, disconnect blower motor control module connectors.
  4. Using voltmeter, measure voltage between blower control module 2-pin connector terminal "B" (Red wire) and ground. If battery voltage is present, go to next step. If less than battery voltage is present, check fuse No. 3 (30-amp) in right underhood fuse block. If fuse is okay, check for open or short to ground in Red wire between fuse No. 3 and blower control module.
  5. Using voltmeter, measure voltage between blower control module 2-pin connector terminal "B" circuit No. 442 (Red wire) and 4-pin connector terminal "C" (Black wire). If less than battery voltage is present, check for open Black wire. Ensure ground connection is clean and tight. If battery voltage is present, go to next step.
  6. Using voltmeter, measure voltage between blower control module 4-pin connector terminal "B" (Gray/Black wire) and ground. If voltage is less than 6 volts, go to next step. If voltage is 6-8 volts, check for loose connection at blower control module connectors. If connections are okay, replace blower control module.
  7. Check Gray/Black wire for short to ground or open (including loose connection at programmer connector terminal E9). If Gray/Black wire and terminal are okay, replace programmer.
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