Test C: The Charging System Warning Indicator Is On With The Engine Running and No Charging System DTCs Present

PINPOINT TEST C: THE CHARGING SYSTEM WARNING INDICATOR IS ON WITH THE ENGINE RUNNING AND NO CHARGING SYSTEM DTCS PRESENT

C1-C2:

C3-C6:

C7-C9:

C10-C12:

Normal Operation
With the engine running, the charging system warning indicator is off. The A circuit 35 (OG/LB) from the battery B+ to the generator regulator is 13-15 volts. This voltage feedback is used by the regulator to maintain the battery voltage at the desired setpoint. The S (stator) circuit (internal to the generator) is used to monitor generator operation. This circuit and other regulator internal conditions are checked by the regulator to allow the PCM to turn off the charging system warning indicator by sending a message over the controller area network (CAN) bus to the instrument cluster (IC). The positive battery output (B+) circuit 38 (BK/OG) is the generator output supplied to the battery and electrical system.

This pinpoint test is intended to diagnose the following:
- Generator
- Circuitry
- IC
- PCM