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Blower Control Module Test

  1. Unplug electrical connectors at blower control module. See Figure. Set ignition switch to RUN position. Push DEF (defrost) button. Set blower motor on HIGH speed.
  2. Measure voltage between 2-pin connector terminal "B" (Red wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, check Red wire for open circuit.
  3. Measure voltage between 2-pin connector terminal "B" (Red wire) and 4-pin connector terminal "C" (Black wire). If battery voltage is not present, check Black wire for open circuit. If battery voltage is present, measure voltage between 4-pin connector terminal "B" (Gray/Black wire) and ground. See Fig 1.
  4. If voltage is not about 8 volts, check Gray/Black wire for open or short circuit. If wire is okay, replace programmer. If voltage is about 8 volts, but blower motor does not run, check blower motor and Purple and Black wires for short or open condition. See BLOWER MOTOR TEST under TESTING. If blower motor and wiring are okay, replace blower control module.
Fig 1: Blower Control Module Connector Terminal ID
G92B15660Courtesy of GENERAL MOTORS CORP.
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