Code B410, Charging System Regulator Problem (Riviera Only): Notes

If Code B409 is also set, follow Code B409 chart first. Circuit 23 runs from the generator to the BCM to provide a PWM signal to the BCM indicating the amount (duty cycle or "ON" time) of regulation. If circuit No. 23 opens or shorts, the BCM will never get the regulator PWM signal and Code B410 will set, however, in this case the generator could still be operating. Code B410 will also set if circuit No. 225 opens. If circuit No. 225 opens, the generator never gets 12-volt signal to start. If the generator never starts, there is no PWM signal to send to the BCM on circuit No. 23.

These conditions can be observed in BCM input and data displays BI51 and BD51 as readings of "HIGH" or "LOW", depending on the state of circuit No. 225 and the percentage of alternator on circuit No. 23 PWM. With the ignition on, engine off, the generator will pull circuit No. 225 low and the PWM circuit No. 23 will be at 0%.

1. BCM input B151 displays generator signal voltage as "HI" or "LO" depending on the voltage state at the BCM. Normally with the ignition on and the engine off, circuit No. 225 will be pulled "LO" by the generator and B151 will read "LO".
2. Checks to see if "LO" reading is due to circuit No. 225 or the generator. If reading changes from "LO" to "HI" when the generator is disconnected, circuit No. 225 and BCM are good.
3. Checks if the fault is due to circuit No. 225 or the BCM.
4. BCM data value B151 displays the amount of generator field activity. Normally, a reading below 7% would indicate a fault in the field circuit or the BCM.
5. Removing the generator connector will determine if the fault is due to the generator or an open in circuit No. 225 (BCM and interface connector).