L411

BCM Code L411:

Battery Voltage Circuit:

CIRCUIT DESCRIPTION:
Code L411 will set when the ignition is "ON" and the BCM is seeing an Ignition-1 reference voltage of less than 10 volts for more than 5 seconds or less than 10.5 volts if Code L411 is already stored in history. When Code L411 is set, the CCDIC will display the message, "LIGHTING FAULT, SERVICE NOW" and redundant relays will be activated. All codes other than B552 will be prevented from setting.

TEST DESCRIPTION: Test numbers refer to circled numbers on the diagnostic chart.

1. If the PCM and ECM are not "seeing" the same battery voltage, then the BCM voltage supply and ground are suspect.
2. If the PCM and BCM voltage parameters are within 1 volt, refer to Charging System for generator diagnosis.

NOTES ON INTERMITTENTS:
If an intermittent Code B411 or B412 is being set observe BCM data value BD50. This battery voltage reading is monitored off of the 10A ISC IGN-1 fuse, fuel reference voltage pin "3D1."