DTC B1446. Chevrolet Caprice WM 2009

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2009 🢒 Caprice WM 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC B1446

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 Expired

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

•	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.

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

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

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 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.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Communication Interface Module Battery Replacement

•	Control Module References for communication interface module replacement, setup and programming.