For 1990-2009 cars

# Supplemental Inflatable Restraint (SIR) Light Operation

Subject: | Supplemental Inflatable Restraint (SIR) Light Operation (Additional Diagnostic and Repair Information)

Models: | 1999 Passenger Cars and Light Duty Trucks

When diagnosing a vehicle with an illuminated "AIR BAG" warning light, or an "AIR BAG" warning light that does not illuminate when the ignition key is first turned to the "ON" position, begin by checking for diagnostic codes using a scan tool. If no diagnostic codes are present, inspect the Sensing and Diagnostic Module (SDM) wiring harness electrical connector for the presence of a "shorting clip" (shorting bar). If the connector has a shorting clip, verify proper operation using the following information:

Important: Some vehicles control the illumination of the "AIR BAG" warning light via serial data communications from the SDM. On those vehicles, use a scan tool to determine if the SDM is controlling the warning light.

### Shorting Clip Operation

When the SDM is DISCONNECTED from the wiring harness connector, the shorting clip inside the wiring harness connector closes which completes the circuit and turns the "AIR BAG" warning light "ON". When CONNECTED to the SDM and with the Connector Position Assurance (CPA) installed, the shorting clip inside the connector opens and the diagnostic circuitry inside the SDM controls the illumination of the light.

See the appropriate Service Manual for additional "AIR BAG" warning lamp diagnostic information.

### Shorting Clip Replacement

At the present time, the 1999 Pontiac Grand Prix uses a shorting clip that requires a special tool for replacement. If a shorting clip requires replacement on this vehicle, order shorting clip service kit P/N 12167318. This shorting clip service kit includes the necessary tool and instructions required for replacement.

Important: The contents of service kit P/N 12167318 will repair up to ten (10) SDM shorting clips.

On all other models equipped with replaceable shorting clips, a special tool is not required. See Group 14.865 of the appropriate GMSPO part catalog for replacement shorting clip availability.

### Parts Information

Part Number | Description
--- | ---
12167318 | Service Kit - SDM Wiring Harness Connector

Parts are currently available from GMSPO.

### Warranty Information

For vehicles repaired under warranty, use:

Labor Operation | Description | Labor Time
--- | --- | ---
N6473 | Wiring and/or Connector - Repair SIR (Supplemental Inflatable Restraint) | Use Published Labor Operation Time