U147B

U147B-IMPLAUSIBLE BATTERY TEMPERATURE RECEIVED FROM IBS

For a complete wiring diagram, refer to the Wiring Information.





Theory of Operation

The Intelligent Battery Sensor (IBS) is an electrical shunt with a microprocessor and is located on the negative battery post. The IBS measures current flow, voltage, and temperature. The microprocessor uses this data to calculate state of charge, battery internal resistance, charge received, charge delivered, and time in service. These values are then sent on the LIN bus to the Body Control Module (BCM). The BCM communicates this information to the Powertrain Control Module (PCM) over the CAN bus.

- When Monitored:
The Body Control Module (BCM) sends configuration information (size and type of battery) to the Intelligent Battery Sensor (IBS) at every key cycle. The IBS learning process requires approximately 2 to 5 vehicle starts and 8 to 12 hours of key-OFF, non running time, and will repeat every time battery power is removed and restored. IBS learning will be achieved in approximately 2 to 4 days of normal vehicle use and operation.

- Set Conditions:
If the installed battery is different than the BCM supplied configuration data, the IBS will ignore the configuration data and report data based on the installed battery. No faults will be set, but a mismatch will be displayed on the scan tool.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1. ACTIVE DTC

NOTE: Diagnose any Communication DTCs before continuing.

1. Ignition on
2. With the scan tool, select View DTCs.

NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

Is the DTC Active or Pending at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test.

2. INTELLIGENT BATTERY SENSOR CIRCUIT DTCS SET IN THE BODY CONTROL MODULE

Are any Intelligent Battery Sensor Circuit DTCs set in the Body Control module?

Yes

- Diagnose the appropriate Intelligent Battery Sensor Circuit DTC in the Body Control module. Testing and Inspection.

No

- Go To 3

3. VERIFY CORRECT BATTERY INSTALLED
1. Verify that the correct battery is installed in the vehicle.

Is the correct battery installed?

Yes

- Replace the Intelligent Battery Sensor (IBS). Intelligent Battery Sensor (IBS) - Removal.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Replace the battery. Battery - Removal.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.