Charging System

The charging system telltale is turned On by the cluster when it receives a command from the PCM (L61) engine or the BCM (L81) engine. The ECM 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.