DTC B1447 RHD

Diagnostic Instructions

DTC Descriptor

DTC B1447 03: Backup Battery Voltage Too Low

DTC B1447 04: Backup Battery Circuit Open

DTC B1447 07: Backup Battery Voltage Too High

Circuit/System Description

The Back-up Battery provides voltage to the communication interface module , to be able to successfully place a call in the event of a main battery disconnect during a collision event.

Conditions for Running the DTC

Conditions for Setting the DTC

The communication interface module detects no voltage from the back-up battery.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

Note: DTC B1447 may set if the communication interface module has been incorrectly disconnected or serviced. When disconnecting the communication interface module, disconnect the harness connector X1 at the communication interface module prior to disconnecting any other harness connectors. This will ensure the back-up battery is preserved when voltage is removed from the communication interface module.

Reference Information

Schematic Reference

Telematics Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Telematics Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X1 at the comunication interface module.
2. Test for greater than 15.5 volts between terminals 13 and 14.

⇒	If less than specified value, test the battery backup supply voltage circuit and battery backup low reference circuit for an open/high resistance, short to ground or short to voltage. If the circuits test normal, replace the back-up battery.

3. If all circuits test normal, replace the comunication interface module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.