Test Notes

Normal Operation

NOTE: Circuit 618 (P/LG) is riveted to the side of the RH air bag sensor case, and the case of the sensor is grounded to the vehicle at its mounting point.

The air bag diagnostic monitor measures the resistance between C233-21, circuit 618 (P/LG), and the reference ground at C232-18, circuit 570 (BK/W). If the air bag diagnostic monitor measures a difference of more than 3.0 ohms between the ground at C232-18, circuit 570 (BK/W), and the ground at C233-21, circuit 618 (P/LG), the air bag diagnostic monitor will store in memory the Diagnostic Trouble Code (DTC) B1944 and flash Lamp Fault Code (LFC) 44 on the air bag indicator. Should the difference in resistance between C232-18 and C233-21 be repaired or otherwise reduced to less than 3.0 ohms, the DTC B1944 will be stored in memory.

Possible Causes
A high resistance reading on C233-21, circuit 618 (P/LG), to ground can be caused by:
- A poor attachment of RH air bag sensor and bracket due to loose mounting, dirt or corrosion at its mounting location.
- An open or damaged wire in circuit 618 (P/LG).
- An open wire or loose rivet inside RH air bag sensor and bracket.
- A poor reference ground at C233-10, circuit 570 (BK/W), and C232-18, circuit 570 (BK/W), of the air bag diagnostic monitor.