Test Notes

NORMAL OPERATIONS
Diagnostic Trouble Code 85 refer to Diagnostic Trouble Code 45 The air bag diagnostic monitor measures the resistance between Pin 20 and the reference ground at Pin 18. If the air bag diagnostic monitor measures a difference of more than 2.0 ohms between the ground at Pin 18 and the ground at Pin 20, the air bag diagnostic monitor will store in memory and flash out on the air bag indicator a DTC 45. Should the difference in resistance between Pin 18 and Pin 20 be serviced or otherwise reduced to less than 2.0 ohms, the air bag diagnostic monitor will flash out a DTC 85 (or a higher priority DTC if one exists) on the next ignition switch cycle.

NOTE: Circuit 620 (P/LB) is riveted to the side of the LH radiator primary crash sensor case and the case of the sensor is grounded to the vehicle at its mounting point.

POSSIBLE CAUSES

High Resistance On Pin 20 To Ground Can Be Caused By:

- A poor attachment of LH radiator primary crash front air bag sensor and bracket due to loose mounting, dirt, or corrosion at its mounting location.

- An open or damaged wire in Circuit 620 (P/LB).

- An open wire or loose rivet inside LH radiator primary crash front air bag sensor and bracket.

- A poor reference ground at Pins 10 and 18 of the air bag diagnostic monitor Circuit 57 (BK)