Diagnostic Instructions

DTC Descriptors

DTC B0047  02: Deployment Commanded Circuit Shorted to Ground

DTC B0047  0F: Deployment Commanded Circuit Erratic

DTC B0047  55: Deployment Commanded Circuit Expected Number of Transitions events not reached

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Air Bag Status Input	B0047 02	B0047 55	B0047 55	B0047 0F

Circuit/System Description

The VIM monitors the signal circuit from the SIR module to the VIM air bag status input circuit, and is a input to the OnStar module.

Conditions for Running the DTC

The system voltage is greater then 9 volts.

Conditions for Setting the DTC

B0047 02

This DTC is set if the VIM detects a short to ground on its airbag status input.

B0047 0F

This DTC is set if the VIM detects transitions occurring on its airbag status input, but cannot determine that these transitions correspond to the Normal signal or the Crash detected signal.

B0047 55

This DTC is set if the VIM does not detect transitions occurring on its airbag status input, indicating that the airbag module is transmitting the abnormal signal, or that the airbag status input is shorted to Battery or Open.

Action Taken When the DTC Sets

The VIM disables the output to the OnStar module until the next ignition cycle.

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Horn Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Horns System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Note: 

1. Verify that no other SIR DTCs are set.

⇒	If DTC is set, refer to Diagnostic System Check - Vehicle.

2. Ignition OFF, disconnect the harness connector of the VIM.
3. Ignition ON, test for 4-5 volts between the signal circuit terminal 9 and ground.

⇒	If less than the specified voltage, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, Replace the VIM.

⇒	If greater than the specified voltage, test the signal circuit for a short to voltage. If the circuit tests normal, Replace the VIM.

4. If all circuits test normal, replace the SIR module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for VIM replacement, setup and programming