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 00: Device Voltage Reference Output 2 Circuit - Battery Current SensorDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5-Volt Reference | B1405 00, B1516 08 | B1516 08 | B1405 00 | -- |
Signal | B1516 08 | B1516 08 | B1516 08 | B1516 08, B1516 66 |
Low Reference | -- | B1516 08 | -- | -- |
Typical Scan Tool Data
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 -10 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/System Description
The battery current sensor is a 3-wire hall effect current sensor. The battery current sensor monitors the current through the negative battery cable. It directly inputs to the body control module (BCM). It creates a 5-volt pulse width modulation (PWM) signal of 128 Hz, and varies the duty cycle. The BCM supplies a 5-volt reference to the battery current sensor. If the BCM detects that the 5-volt reference circuit is shorted, then DTC B1405 sets.
Conditions for Running the DTC
The BCM is awake.
Conditions for Setting the DTC
The BCM detects that the 5-volt reference circuit is shorted to ground or shorted to voltage.
Action Taken When the DTC Sets
The regulated voltage control (RVC) is disabled.
Conditions for Clearing the DTC
The DTC passes when the voltage on the 5-volt reference circuit returns to the normal range for 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 Verification
- Ignition ON, engine OFF, turn off the headlamps and all accessories. Do not connect a battery charger.
- Observe the scan tool BCM Battery Current parameter. The reading should be between -5 and -10 amps, and change with the amount of current draw from the battery.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the battery current sensor.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the low reference circuit terminal B and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
- Verify the scan tool BCM Battery Current is greater than 50 amps.
- Install a 3A fused jumper wire between the signal circuit terminal C and the low reference circuit terminal B. Verify the scan tool BCM Battery Current is less than -50 amps.
- If all circuits test normal, replace the battery current sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
| ⇒ | 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, then 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, then replace the BCM. |
| ⇒ | If less than the specified range, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. 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. |
