For 1990-2009 cars

### Circuit Description

The generator battery control module monitors its internal battery current sensor for many charging system operations. When the values of the battery current sensor go out of range, DTC B1516 will set.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1516 Battery Current Sensor Performance

### Conditions for Running the DTC

• | Vehicle in RUN mode and Engine Run Flag is True.

• | This diagnostic shall be run every 50 ms.

### Conditions for Setting the DTC

The duty cycle of the internal battery current sensor is less than 2 percent duty cycle or greater than 98 percent duty cycle for greater than 240 seconds.

### Action Taken When the DTC Sets

• | The filtered battery current is set to 0.1 amp.

• | The generator field control circuit duty cycle is set to 100 percent, battery voltage defaults to 13.8 volts.

• | The generator battery control module will request the driver information center (DIC) message of Service Charging System. The battery indicator remains OFF.

### Conditions for Clearing the DTC

The duty cycle of the internal battery current sensor is greater than 2 percent duty cycle or less than 98 percent duty cycle.

### Diagnostic Aids

Important: You must cycle the ignition after clearing the DTC to turn OFF the DIC message of Service Charging System.

Recommended Action:

• | Clear the codes.

• | Cycle the ignition.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Starting and Charging Schematics Connector End View Reference: Engine Electrical Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Install a scan tool.
2. Clear DTC.
3. Cycle ignition.

Does DTC B1516 reset?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections

3 | Replace the generator battery control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 4 | --
4 |

1. Use the scan tool in order to clear the DTC.
2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK