Code B410, Charging System Circuit Fault: Notes

The generator on this vehicle has fault detection capability built into the regulator. The BCM supplies 12 volts on circuit No. 25 (terminal "I") and monitors the field voltage on circuit No. 23 (terminal "F+"). Code B410 will set if the following conditions exist:

• Engine running
• Generator enable line is low

OR IF THE FOLLOWING CONDITIONS EXIST:

• Engine running
• Generator enable line high
• Generator field input is less than 2 percent

OR IF THE FOLLOWING CONDITIONS EXIST:

• Ignition on, engine not running
• Generator enable line is high

OR IF THE FOLLOWING CONDITIONS EXIST

• Ignition on, engine not running
• Generator enable line is low
• Generator field input is less than 2 percent

Code B140 will cause the ELECTRICAL PROBLEM warning light to illuminate.

1. BI51 displays generator signal voltage as HI or LO, depending on the voltage state at BCM. Normally, with key on and engine off, circuit No. 25 voltage will be pulled low by the generator and BI51 will read LO.
2. Checks to see if LO reading is due to circuit No. 25 or the 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. BD51 displays the 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 will determine if fault is due to generator or an open in circuit No. 25, including BCM and interface connector.