Airbag DM Fault Code 44

Airbag DM Fault Code 44

Right hand crash sensor incorrectly mounted.

Normal Operation

The diagnostic module constantly measures the resistance between pins 2-8 (RH crash sensor ground) and 1-3 (airbag DM system ground). If the resistance rises above 2Ω, fault code 44 is declared and the airbag warning lamp is illuminated.

Possible Causes

• Loose sensor mounting or an accumulation of dirt or corrosion at the sensor mountings.
• An open circuit or loose wire from DM pin 2-8 to the sensor.
• An open circuit wire or loose rivet within the sensor.

Fault Analysis

1. Disarm the airbag system and fit airbag simulators (6.4.21.4).
2. Disconnect the diagnostic module and check continuity between pins 1-3 and 2-8.

   If the resistance is significantly greater than 0Ω, go to step 3.

   If the circuit resistance is 0Ω, the fault is intermittent. Manipulate the harness, particularly in the area of the sensor connector and the crash sensor harness to bulkhead harness connector, to identify the location of the open circuit. Service the circuit as necessary.

3. Check the right hand crash sensor mounting for security and corrosion.

   If neither problem is evident, go to step 4.

   If either problem is evident, remove, clean and resecure the sensor. Reconnect the diagnostic module. Switch on and clear the code 44. Switch off and then on again to check that the airbag warning lamp comes on at 'ignition on' and extinguishes after approximately six seconds.

4. Check the right hand crash sensor connector for security and service the connector if necessary.

   If the connector is secure, disconnect and check continuity from pin 1 to pin 2 of the sensor.

   If the resistance is high or an open circuit is detected, replace the crash sensor. Go to step 5

   If the sensor continuity is good (0Ω), service the crash sensor harness or bulkhead harness as necessary to remove the high resistance or open circuit. Go to step 5.

5. With the airbag simulators in circuit and all connectors in place, clear the code 44. Switch off and then on again to check that the airbag warning lamp comes on at 'ignition on' and extinguishes after approximately six seconds.
6. Switch off and rearm the airbags (6.4.21.4)