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Power Transistor

  1. Remove blower case. See BLOWER CASE under REMOVAL & INSTALLATION. Remove power transistor. See Fig 1 .
  2. Set up a test circuit using a 12-volt battery, test switch, ammeter, voltmeter and blower motor.
    • Connect jumper wire between battery negative terminal and Black wire terminal of blower motor connector.
    • Connect jumper wire between terminal "B" of power transistor connector and Blue/White wire terminal of blower motor connector.
    • Connect ammeter between battery positive terminal and terminal "A" of power transistor connector.
    • Connect test switch between battery positive terminal and terminal "C" of power transistor connector.
    • Connect voltmeter between battery positive terminal and terminal "B" of power transistor connector.
  3. With test switch open, ammeter should read less than 0.01 amp. With test switch closed, voltmeter should read less than 3 volts. If ammeter and voltmeter do not read as specified, replace power transistor.
Fig 1: Testing Power Transistor
G91F04859Courtesy of MAZDA MOTORS CORP.
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