DTC 33 - Pin 7 Not Grounded at Diagnostic Monitor

Electrical Schematic:

Circuit Description
A fault code 33 may occur even though the vehicle is not equipped with a passenger side air bag due to the internal logic of the diagnostic monitor.

Normal Operation
The diagnostic monitor measures the resistance across pin 8 and pin 9 every time the ignition switch is turned to the ON position. Normal resistance across these circuits is between 0.9 ohms and 1.1 ohms. This resistance comes from the passenger air bag itself. If the vehicle is NOT equipped with a passenger air bag, the resistance across pins 8 and 9 should be infinite (open) and pin 7 of the diagnostic monitor should be connected to ground. Connecting pin 7 to ground programs the diagnostic monitor to ignore high resistance on the passenger air bag circuits. If the resistance across these two circuits exceeds 4.0 ohms and pin 7 is not grounded, the diagnostic monitor will flash a code 33 on the air bag lamp.

Possible Causes
A high resistance or open in the passenger side air bag circuit can be caused by the following:
1. Pin 7 not connected to ground.

Pinpoint Test Steps:

33-1 - 33-2: