B0947

DTC B0047

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

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/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

* The current DTC will become history when the request for the output is removed.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Reference Information
Schematic Reference

Horn Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Horns System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) 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 (Initial Inspection and Diagnostic Overview).

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 (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for VIM replacement, setup and programming