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 Descriptors

DTC B1516 08: Battery Current Sensor Performance Signal Invalid
DTC B1516 66: Battery Current Sensor Performance Wrong Mounting Position

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
5-Volt Reference | B1516 08 | B1516 08 | -- | --
Signal | B1516 08 | B1516 08 | B1516 08 | B1516 08, B1516 66
Ground | -- | B1516 08 | -- | --

### Circuit/System Description

The body control module (BCM) supplies 5 volts and ground to the battery current sensor. The battery current sensor measures the amount of current flowing to or from the battery, and supplies a pulse width modulation (PWM) signal to the BCM. The BCM monitors the battery current signal, and sets DTC B1516 08 if the signal is outside the normal range if 3-97 percent duty cycle. The BCM also monitors the current polarity, and sets DTC B1516 66 if reverse polarity is detected.

### Conditions for Running the DTC

#### B1516 08

The BCM is awake.

#### B1516 66

• | The BCM is awake.

• | The hood, doors, and rear compartment are closed.

• | The engine is not running.

• | DTC B1516 08 has run and passed.

• | DTC B1516 66 has not run and passed.

### Conditions for Setting the DTC

#### B1516 08

The battery current signal is less than 3 percent or greater than 97 percent duty cycle for 1 minute.

#### B1516 66

The battery current polarity is positive for 2 minutes.

### Action Taken When the DTC Sets

The regulated voltage control (RVC) is disabled.

### Conditions for Clearing the DTC

• | The DTC passes when the battery current signal returns to normal range for 5 seconds.

• | A history DTC will clear after 100 ignition cycles.

### Reference Information

#### Schematic Reference

• | Starting and Charging Schematics

• | Body Control System 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 Testing

#### B1516 08

1. Ignition OFF, disconnect the battery current sensor.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal B and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.

⇒ | If less than the specified range , test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, then replace the BCM.

⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, then replace the BCM.

4. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal C and ground.

⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, replace the battery current sensor.

#### B1516 66

1. Verify that the battery current sensor is installed securely around the negative battery cable, and positioned with the tape tab pointing away from the negative terminal of the battery and toward the chassis ground.

⇒ | If the battery current sensor is not installed correctly, remove and reinstall the sensor.

2. Replace the battery current sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Battery Current Sensor Replacement

• | Control Module References for BCM replacement, setup, and programming.