B1516
DTC B1516
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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/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 of 4-96 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 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 4 percent or greater than 96 percent duty cycle for 2 minutes.
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 the normal range for 2 minutes.
* A history DTC will clear after 100 ignition cycles.
Diagnostic Aids
DTC B151 66 may set if a battery charger is used.
Reference Information
Schematic Reference
* Starting and Charging Schematics ([1][2]Electrical Diagrams)
* Body Control System Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Charging System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
1. Verify that the current sensor is mounted correctly on the negative battery cables. The sensor should be installed with the coil around the negative battery cables, with the tape tab pointing away from the battery.
2. Ignition OFF, disconnect the battery current sensor.
3. Ignition OFF and scan tool disconnected, remove the 30A IBCM 1 fuse 20 from the underhood fuse block, and wait 45 seconds. Test for less than 5 ohms between the low reference circuit terminal B and ground.
• If greater than the specified value, test the current sensor low reference circuit and the BCM ground circuits for an open/high resistance. If the circuits test normal, replace the BCM.
4. Ignition ON, test for 4.5-5.5 volts on the 5-volt reference circuit terminal A.
• 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, 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, replace the BCM.
5. Ignition ON, test for 4.5-5.5 volts on the signal circuit terminal C.
• 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.
6. If all circuits test normal, replace the battery current sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Battery Current Sensor Replacement (LAT) ()
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming.