No Airbag Indicator - Inoperative Indicator Circuit

Electrical Schematic:

Normal Operation
The air bag indicator is designed to light for 6 (± 2) seconds when the ignition switch is turned to the RUN position. This initial 6 seconds of air bag indicator illumination (continuous lamp) is considered normal operation and is called proveout of the air bag indicator.

The diagnostic monitor requires power at Pin 1 or Pin 6 in order to energize the air bag indicator circuit. If the air bag indicator circuit is open or the diagnostic monitor does not have ignition voltage at Pins 1 and 6, the air bag indicator will not light.

If the air bag indicator circuit is open and if another system fault exists, an audible tone will be heard indicating the need for service. The tone is a series of five sets of five beeps. This DOES NOT indicate any diagnostic trouble code. It means that the indicator circuit is malfunctioning and must be serviced before the diagnostic trouble code can be read.

Possible Causes
A No Air Bag Indicator condition can be caused by:
1. A burned out bulb or open wiring in the air bag indicator circuit.
2. Loss of ignition voltage at Pins 1 and 6 of the diagnostic monitor.

Pinpoint Test Steps:

NAB1 - NAB2: