GM Service Manual Online
For 1990-2009 cars only

DTC Descriptor

DTC B1516 08 : Battery Current Sensor Signal Invalid

DTC B1516 66 : Battery Current Sensor Wrong Mounting Position

Diagnostic Fault Information

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

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Battery Current Sensor Supply Voltage

B1516 08

B1516 08

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B1516 08

Battery Current Sensor Signal Circuit

B1516 08

B1516 08

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B1516 08

Battery Current Sensor Low Reference Circuit

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B1516 08

--

B1516 08

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 PWM input signal is less than 4 percent or more than 96 percent for more 33 seconds.

B1516 66

The BCM detects the battery current sensor is improperly installed.

Action Taken When the DTC Sets

The DTC sets as current , no driver indication or message is 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.

Reference Information

Schematic Reference

Starting and Charging Schematics or Body Control System Schematics

Connector End View Reference

Engine Electrical Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing

B1516 08

Battery Current Sensor Signal Invalid

  1. Ignition OFF, disconnect the harness connector at the battery current sensor.
  2. Ignition OFF, verify a test lamp illuminates between B+ and the low reference circuit terminal B.
  3. If the test lamp did not illuminate , test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition ON, test for 5 volts between the battery current sensor supply voltage circuit terminal A and ground.
  5. If less than the specified range , test the battery current sensor supply voltage circuit terminal A for a short to ground or an open/high resistance. If the circuit test normal replace the BCM.
  6. Test for 5 volts between the battery current sensor signal circuit terminal C and ground.
  7. 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 test normal replace the BCM.
  8. If all circuits test normal test or replace the battery current sensor.

B1516 66

When diagnosing B1516 66 verify that the battery current sensor is installed securely and positioned in the correct current flow direction.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming

Battery Current Sensor Replacement