DTC B1446 RHD
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 B1446: Backup Battery Timer ExpiredCircuit/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
| • | Ignition is in the RUN or ACC position. |
| • | System voltage is between 9.5 and 15.5 volts. |
| • | DTC B1447 is not set. |
Conditions for Setting the DTC
The communication interface module detects that the back-up battery voltage has dropped below the minimum threshold value.
Action Taken When the DTC Sets
The communication interface module commands the red LED ON.
Conditions for Clearing the DTC
| • | When the CIM detects the voltage of the back-up battery is above the minimum threshold value. |
| • | The history DTC will clear after 50 fault-free ignition cycles. |
Diagnostic Aids
Note: Shorting the back-up battery positive voltage circuit to the back-up battery ground circuit or chassis ground will activate the internal circuit protection of the back-up battery , rendering the back-up battery inoperable.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Telematics 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 X1 at the comunication interface module.
- Test for greater than 15.5 volts between terminals 13 and 14.
- If all circuits test normal, replace the comunication interface module.
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for communication interface module replacement, setup and programming. |
