Test Notes

Normal Operation
The air bag indicator is designed to light for six (± two) seconds when the ignition switch is turned to the RUN position. This initial six seconds of air bag indicator illumination is considered normal operation and is called prove out of the air bag indicator. If there is an open in the air bag indicator circuit at Pin C233-11, Circuit 608 (BK/Y), a no air bag indicator fault will occur and this prove out will not be seen.

If the air bag diagnostic monitor detects an open in the air bag indicator circuit and another system fault exists, the air bag diagnostic monitor will turn on its internal tone generator (beeper). The beep pattern is five sets of five beeps The pattern is repeated every 30 minutes while the ignition switch is in the RUN position. The five beeps do not indicate a Lamp Fault Code (LFC) 55 or any other LFC. The indicator circuitry must be repaired before the Diagnostic Trouble Code (DTC) can be read.

The air bag diagnostic monitor requires power at Pin C232-6, Circuit 364 (BK/LO) to energize the air bag indicator circuit properly. Loss of ignition voltage at Pin C232-6, Circuit 364 (BK/LG) due to an open circuit or short to ground will result in a continuous air bag indicator, due to the ignition voltage applied to Pin C233-19, Circuit 584(Y); refer to Pinpoint Test R, Normal Operation.R: Air Bag Indicator Lamp on at All Times

If the air bag diagnostic monitor is disconnected or not firmly plugged in, a shorting bar in the black air bag diagnostic monitor harness connector C233 shorts Pin C233-10, Circuit 570 (BK/W) to Pin C233-11, Circuit 608 (BK/Y), turning the air bag indicator lamp on continuously; refer to Pinpoint Test R. Normal Operation.R: Air Bag Indicator Lamp on at All Times

Possible Causes
An inoperative air bag indicator circuit can be caused by:
- a burned-out bulb or open wiring in the air bag indicator circuit.