Code B410 - Charging System Circuit Fault: Notes

Fig 1: Trouble Code B410 Wiring Diagram (1 of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Trouble Code B410 Flow Chart (2 of 2)

Courtesy of GENERAL MOTORS CORP.

Generator on this vehicle has fault detection capability built into regulator. BCM supplies 12 volts on circuit No. 25, and monitors field voltage on circuit No. 23.

Code B410 sets if following conditions exist:

• Engine running
• Generator enable line is low Or if following conditions exist:
• Engine running
• Generator enable line high
• Generator field input is less than 2 percent Or if following conditions exist:
• Ignition on, engine not running
• Generator enable line is high Or if following conditions exist:
• Ignition on, engine not running
• Generator enable line is low
• Generator field input is less than 2 percent

Code B410 causes GENERATOR PROBLEM message to be displayed on DIC and NO CHARGE telltale to light on IPC.

1. BI51 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. BD51 displays amount of generator field activity. Under normal conditions, a reading less than 7 percent would indicate a fault in field circuit at BCM.
5. Removing generator connector determines if fault is due to generator or an open in circuit No. 25, including BCM and interface connector.