B1516

DTC B1516

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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 Signal Invalid

DTC B1516 66
- Battery Current Sensor Wrong Mounting Position

Circuit/System Description

The battery current sensor is a 3-wire hall effect current sensor. The battery current sensor monitors the battery current. It directly inputs to the body control module (BCM). It creates a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 5-95 percent. Between 0-5 percent and 95-100 percent are for diagnostic purposes.

Conditions for Running the DTC

* The ignition is ON.
* The engine is running.

Conditions for Setting the DTC

B1516 08

The BCM detects a duty cycle of the PWM input signal is less than 3 percent or more than 97 percent for more than 60 seconds.

B1516 66

The BCM detects the battery current sensor is improperly installed.

Action Taken When the DTC Sets

There is no battery telltale illuminated or driver information center (DIC) message displayed.

Conditions for Clearing the DTC

The DTC clears as current status when the battery sensed current returns to normal range for more than 5 seconds.


Circuit/System Testing

B1516 08
1. Ignition OFF, disconnect the harness connector at the battery current sensor.
2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal B and ground.

* If greater than the specified range, test the low reference circuit for an open/high. If the circuit tests normal, replace the BCM.

3. Ignition ON, test for 5 volts between the battery current sensor supply voltage circuit terminal A and ground.

* If less than the specified range, test the battery current sensor supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Test for 5 volts between the battery current sensor signal circuit and ground.

* If less than 5 volts, test the battery current sensor signal circuit terminal C for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

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

B1516 66

Verify that the battery current sensor is installed securely and positioned with the tape tab pointing away from the negative terminal and toward the positive terminal on the battery.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Refer to Programming and Relearning for BCM setup and programming. Programming and Relearning
* Battery Current Sensor Replacement (4.3L) Battery Current Sensor Replacement (4.8L, 5.3L, 6.0L, and 6.2L)