Test Notes

NORMAL OPERATION
The air bag diagnostic monitor measures the voltage at Pins C1-2, C1-3, C1-4 and C1-5 of the air bag diagnostic monitor connector. The voltage at these pins is set by the air bag diagnostic monitor and varies with charging system voltage (the expected voltages are shown in the following table). If the air bag diagnostic monitor detects low voltage on any of these pins, the air bag diagnostic monitor will store in memory DTC B1913 and flash lamp fault code 13 on the air bag indicator to indicate a possible short to ground on these circuits.

At the same time the air bag diagnostic monitor begins flashing lamp fault code 13, it attempts to disarm the air bag system to prevent inadvertent deployment of the air bag(s) by blowing the power distribution box fuse 16 (10A) feeding air bag diagnostic monitor Pins C1-13 and C1-14. It attempts to blow the fuse by activating a solid state switch which shorts the battery feed at Pin C1-13, Circuit 609 (O/Y) to sheet metal ground at the air bag diagnostic monitor's bracket.

The Air Bag Diagnostic Monitor Will Make Up To Three Attempts To Blow This Fuse, Spaced One Minute Apart.

1. If the air bag diagnostic monitor has blown the fuse and thus removed battery positive voltage (B+) at Pin C1-14, a DTC B1867 will be stored.

2. If the air bag diagnostic monitor attempts to blow the 10A airbag fuse three times and fails each time, a DTC B1924 will be stored.

3. After the 10A fuse is blown or three attempts to blow it fail, the air bag diagnostic monitor will not attempt to disarm again until the DTC B1913 has been serviced and cleared by performing Pinpoint Test B1913.

4. Should the short on Pins C1-2, C1-3, C1-4 and C1-5 be intermittent or repaired, the air bag diagnostic monitor will flash a lamp fault code 53 (or a higher priority DTC such as lamp fault code 12 if one exists) on the next ignition switch cycle.