Code B410 - Charging System Circuit (Regulator): Notes

The generator on this vehicle has fault detection capability built into the regulator. The BCM will supply 12 volts to the regulator over circuit 225, the I-terminal, and monitor the field voltage of the generator by way of a PWM signal over circuit 23, the F+ terminal.

Code B410 will set if there is an open or short to ground in either circuit 23 or circuit 225, a drive belt break or if an undervoltage to overvoltage condition exists. If there is a short to ground on circuit 225, the "NO CHARGE" telltale will light on the IPC.

1. BCM input BI51 displays generator signal voltage as HI or LO depending on the voltage state at the BCM. Normally with key on, engine off, circuit 225 will be pulled LO by the generator and BI51 will read LO.
2. This step checks to see if the LO reading is due to 225 or the generator. If the reading changes from LO to HI when the generator is disconnected, the circuit, the circuit 225 and the BCM are okay.
3. This step determines if the fault is due to the BCM or circuit 225.
4. BCM data value BD51 displays the amount of generator field activity. Under normal conditions, a reading below 7 percent would indicate a fault in the filed circuit of the BCM.
5. Removing the generator connector will determine of the fault is due to the generator or an open in circuit 225, including the BCM and interface connector.