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 Descriptor
DTC B1405: Device Voltage Reference Output 2 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5-Volt Reference | B1516 | B1516 | -- | B1516 |
Signal | B1405 | B1405 | -- | B1405 |
Low Reference | -- | B1405 | -- | B1405 |
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
The BCM detects a duty cycle of PWM input signal is less than 4 percent or more than 96 percent for more 33 seconds.
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
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the battery current sensor.
- Ignition OFF, test for less than 5.0 ohms between the low reference circuit terminal B and ground.
- Ignition ON, test for 4.8 - 5.2 volts between the supply voltage circuit terminal A and ground.
- Ignition ON, test for 4.8 - 5.2 volts between the signal circuit terminal C and ground.
- If all circuits test normal, test or replace the battery current 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 less than the specified range , test the supply voltage 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 supply voltage circuit for a short to voltage. If the circuit tests, normal replace the BCM. |
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
