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Home >> Oldsmobile >> 1992 >> Toronado Base >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Alternator & Regulator >> Trouble Code Charts >> Code B410, Charging System Circuit Fault >> Test Description

Test Description

NOTE: Test numbers refer to numbers on diagnostic chart. The term "generator" in diagnostic chart is used in place of "alternator".
  1. BCM INPUT BI51 value displays generator signal voltage as HI or LO, depending on voltage state at BCM. Normally, with key on and engine off, circuit No. 25 voltage will be pulled low by generator, and BI51 will read LO.
  2. Checks to see if low reading is due to circuit No. 25 or generator. If display reading changes from LO to HI when the generator is disconnected with engine running, BCM and circuit No. 25 are okay.
  3. Checks to see if fault is due to BCM or circuit No. 25.
  4. BCM DATA BD51 value displays amount of generator field activity. Under normal conditions, a reading less than 7 percent would indicate a fault in field circuit or BCM.
  5. Removing generator connector determines if fault is due to generator or an open in circuit No. 25, including BCM and interface connector.
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