Allante V8-273 4.5L (1991)
Body Control Module: Initial Inspection and Diagnostic Overview
Volts Lamp
Volts Lamp Circuit
TEST CONDITION:
None
FAILURE CONDITION:
1.
Generator charge input (terminal L) low.
2.
Code B410 set.
ACTION TAKEN:
Light "Volts" lamp on IPC.
The BCM monitors the generator L-terminal input on pin 3C13. This input indicates whether the generator is charging or not. If the generator is not
charging, it grounds the L-terminal. If the generator is charging, it leaves the L-terminal ungrounded. The BCM uses this input to determine whether the
volts lamp should be illuminated. Whenever the L-terminal input is low or BCM code B410 is set, the BCM will command the IPC to turn on the volts
telltale via the UART dataline.
NOTE: When the engine is not running, the generator will not be charging. Therefore, it is normal for the "Volts" lamp to illuminate with the ignition
on, the engine not running. This is a bulb test mode that allows the driver to verify that the "Volts" lamp is operational.
Condition Possible Causes:
^
Erroneous Lamp - short to ground on circuit 225, or failed generator.
^
No Lamp - open in circuit 225, open in circuit 250 or open in generator circuitry.
