Generator Battery Control Module Scan Tool Information
WARNING: This page is about a different car, the 2009 GMC Envoy and 2009 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Generator Battery Control Module (GBCM)
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions: Ignition ON/Engine OFF | |||
| Battery Voltage Signal | - | 12.3 V | The scan tool displays 0-20 volts. The scan tool displays the voltage as received by the module. |
| Generator L Terminal Signal Command | - | 0 Percent | The scan tool displays On/Off. The scan tool displays Off until the engine is running, at which time it will display On. |
| Regulated Voltage Control Current Sensor | - | Varies | The scan tool displays Amps. This controls how much current is going to or from the negative battery cable. |
| Running State of Charge | - | Varies | The scan tool displays percent. This calculates the battery's state of charge based on current and voltage over a long period of time. |
Generator Battery Control Module Output Controls
| Output Control | Description |
|---|---|
| GEN L-Terminal | The engine control module (ECM) commands the generator OFF by removing the 5-volt reference signal from the L terminal of the voltage regulator when you select OFF. The generator will then stop generating an output voltage. |