For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC B1516: Battery Current Sensor Performance

### Circuit/System Description

The generator battery control module (GBCM) monitors its internal battery current sensor for many charging system operations. If the battery current sensor signal is out of range, DTC B1516 will set.

### Conditions for Running the DTC

• | The ignition is ON.

• | This diagnostic runs 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 4 minutes.

### Action Taken When the DTC Sets

• | The charge indicator turns ON.

• | The driver information center (DIC) displays the SERVICE CHARGE SYS message.

### Conditions for Clearing the DTC

• | The DTC will pass when the duty cycle of the internal battery current sensor is between 2 percent and 98 percent duty cycle.

• | You must cycle the ignition after clearing the DTC to turn OFF the DIC message and charge indicator.

### Reference Information

#### Schematic Reference

Starting and Charging Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Charging System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, headlamps and all accessories OFF, observe the scan tool BCM Battery Current parameter. The reading should be between -30 amps and 30 amps, and change with the amount of current draw on the battery.

### Circuit/System Testing

Replace the GBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for GBCM replacement, setup, and programming.