General

This vehicle is equipped with a Powertrain Control Module (PCM) controlled charging system. The PCM-controlled charging system is a system whereby the PCM determines the optimal voltage set point for the charging system and communicates this information to the voltage regulator. The PCM-controlled charging system is unique in that it has two unidirectional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated. The Generator Communication (GEN COM) line communicates the desired set point from the PCM to the voltage regulator and the Generator Monitor (GEN MON) line communicates the generator load and error conditions to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.

CIRCUIT DESCRIPTION
B+ Output Terminal Circuit 30-BA6 (RD)
Generator output voltage is supplied through the battery positive (B+) output terminal on the rear of the generator to the battery and the electrical system.

Circuit 30-BA25 (RD)
This is the A terminal battery voltage sense circuit and is used to sense battery voltage. The circuit is used to supply current to the generator field (rotor) and to turn on the voltage regulator which determines generator output. This circuit is also used to turn the charging system warning indicator on if there is a fault in the charging system operation.

Circuit 10-BA25 (GY/RD)
This is the Generator Communication (GEN COM) circuit. The PCM determines the optimal voltage set point for the charging system and communicates this information to the voltage regulator via the GEN COM circuit.

Circuit 8-BA25 (WH/RD)
The Generator Monitor (GEN MON) circuit communicates the generator load and error conditions to the PCM.