• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
BCM B+ | B1516 08 | B1516 08 | -- | -- |
5-Volt Reference | B1516 08 | B1516 08 | -- | -- |
Signal | B1516 08 | B1516 08 | B1516 08 | B1516 08, B1516 66 |
Low Reference | -- | B1516 08 | -- | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Headlamps and all accessories Off. Parameter Normal Range: -5 amps to -25 amps | |||
BCM B+ | -59.9 amps | -59.9 amps | -- |
5-Volt Reference | -59.9 amps | -59.9 amps | -- |
Signal | -59.9 amps | 59.9 amps | 59.9 amps |
Low Reference | -- | 59.9 amps | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.60 Volts | |||
BCM B+ | 25.60 Volts | 26.10 Volts | -- |
The battery current sensor is a 3 wire hall effect current sensor. The battery current sensor monitors the battery current. The signal circuit is an input to the body control module (BCM). The sensor 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 4-96 percent. The signal circuit is an input to the body control module (BCM). If the duty cycle is outside of the normal range, DTC B1516 08 sets. The BCM also tests for correct polarity of the sensor. If the BCM detects positive current flow with the engine OFF, DTC B1516 66 sets.
The BCM is awake.
• | The BCM is awake. |
• | The engine is OFF. |
• | The hood and doors are closed. |
• | DTC B1516 08 has run and passed during this ignition cycle. |
• | DTC B1516 66 has not already run and passed during this ignition cycle. |
The BCM detects the sensor signal duty cycle is less than 4 percent or greater than 96 percent for 2 minutes.
The BCM detects positive battery current when the engine is OFF.
Regulated voltage control (RVC) is disabled.
• | The DTC passes when the battery sensed current returns to the normal range for 15 seconds. |
• | A history DTC will clear after 100 ignition cycles. |
Charging System Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Ignition ON, headlamps and all accessories OFF, observe the scan tool BCM Battery Current parameter. The reading should be between -5 amps and -25 amps, and change with the amount of current draw on the battery.
⇒ | If not the specified value, test the following BCM circuits for an open/high resistance. If the circuits test normal, replace the BCM. |
• | B+ circuit terminal 3 X3 |
• | Ground circuit terminal 1 X3 |
• | Ground circuit terminal 5 X3 |
• | Ground circuit terminal 9 X4 |
⇒ | If the sensor is not installed correctly, remove and reinstall the sensor. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If not within 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 not within 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming. |