Charging System

The charging system telltale is turned ON by the cluster when it receives a command from the powertrain control module (PCM) (L61) engine or the body control module (BCM) (L81) engine. The engine control module (ECM) (L81) sends a message to the BCM over the CAN serial data link. This indicates to the operator of the vehicle that there is a possible problem in the charging circuit.

The charging system telltale will turn ON, for approximately 3 seconds, during engine start-up until the PCM or ECM senses voltage output by the generator for a system check.