46-1x

SRS DTC Troubleshooting: 44-1x, 46-1x

DTC 44-1x ("x" can be 0 thru 9 or A thru F):

No Signal From the Right Side Impact Sensor (first)

DTC 46-1x ("x" can be 0 thru 9 or A thru F):

No Signal From the Right Side Impact Sensor (second)

NOTE:

- Before doing this troubleshooting procedure, find out if the vehicle was in a collision. If so, verify that all the required components were replaced with new components, of the correct part number, and that they were properly installed Service and Repair.
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures Service and Repair, General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes, and 12 Volt Battery Terminal Disconnection and Reconnection Procedures.
- Before replacing the SRS unit, check the SRS unit software version with the HDS. If the software version is not the latest, update the SRS unit software and retest.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to ON (II), then wait for 10 seconds.

3. Check for DTCs with the HDS.

Is DTC 46-1x (except 46-11) indicated?

YES -

Faulty right side impact sensor (second); replace the right side impact sensor (second) Side Impact Sensor (Second) Replacement, then clear the DTC.

NO -

Go to step 4.

4. Clear the DTCs with the HDS.

5. Turn the ignition switch to ON (II), then wait for 10 seconds.

6. Check for DTCs with the HDS.

Is DTC 44-1x (except 44-11) indicated?

YES -

Faulty right side impact sensor (first); replace the right side impact sensor (first) Side Impact Sensor (First) Replacement, then clear the DTC.

NO -

Go to step 7.

7. Clear the DTCs with the HDS.

8. Turn the ignition switch to ON (II), then wait for 10 seconds.

9. Check for DTCs with the HDS.

Is DTC 46-11 indicated?

YES -

Go to step 13.

NO -

Go to step 10.

10. Clear the DTCs with the HDS.

11. Turn the ignition switch to ON (II), then wait for 10 seconds.

12. Check for DTCs with the HDS.

Is DTC 44-11 indicated?

YES -

Go to step 46.

NO -

Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.

13. Turn the ignition switch to LOCK (0).

14. Check the connections between SRS unit connector B (39P) and the SRS unit, and between the floor wire harness 4P connector and the right side impact sensor (first) Side Impact Sensor (First) Replacement and between the floor wire harness 2P connector and the right side impact sensor (second) Side Impact Sensor (Second) Replacement.

Are the connections OK?

YES -

Go to step 15.

NO -

Replace the floor wire harness, then clear the DTC.

15. Turn the ignition switch to ON (II).

16. Confirm with the HDS that the DTC for left side impact sensor is not stored.

17. Turn the ignition switch to LOCK (0).

18. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

19. Remove the left side impact sensor (second) Side Impact Sensor (Second) Replacement, or prepare a known-good side impact sensor.

20. Exchange the right side impact sensor (second) for the impact sensor prepared in step 19.

21. Reconnect the negative cable to the 12 volt battery.

22. Clear the DTCs with the HDS.

23. Turn the ignition switch to ON (II), then wait for 10 seconds.

24. Check for DTCs with the HDS.

Is DTC 46-11 indicated?

YES -

Go to step 25.

NO -

Faulty right side impact sensor (second); replace the right side impact sensor (second) Side Impact Sensor (Second) Replacement, then clear the DTC.

25. Turn the ignition switch to LOCK (0).

26. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

27. Return the impact sensor (first) which was replaced in step 20.

28. Remove the left side impact sensor (first) Side Impact Sensor (First) Replacement, or prepare a known-good side impact sensor.

29. Exchange the right side impact sensor (first) for the impact sensor prepared in step 28.

30. Reconnect the negative cable to the 12 volt battery.

31. Clear the DTCs with the HDS.

32. Turn the ignition switch to ON (II), then wait for 10 seconds.

33. Check for DTCs with the HDS.

Is DTC 46-11 indicated?

YES -

Go to step 34.

NO -

Faulty right side impact sensor (first); replace the right side impact sensor (first) Side Impact Sensor (First) Replacement, then clear the DTC.

34. Turn the ignition switch to LOCK (0).

35. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

36. Disconnect SRS unit connector B (39P) from the SRS unit.

37. Disconnect the floor wire harness 4P connector from the right side impact sensor (first) Side Impact Sensor (First) Replacement.

38. Disconnect the floor wire harness 2P connector from the right side impact sensor (second) Side Impact Sensor (Second) Replacement.

39. Measure the resistance between the floor wire harness 2P connector (right side impact sensor (second)) terminals No. 1 and No. 2. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?

YES -

Go to step 40.

NO -

Short to another wire in the floor wire harness between the right side impact sensor (first) and the right side impact sensor (second); replace the floor wire harness, then clear the DTC.

40. Measure the resistance between body ground and the floor wire harness 2P connector (right side impact sensor (second)) terminals No. 1 and No. 2 individually. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?

YES -

Go to step 41.

NO -

Short to ground in the floor wire harness between the right side impact sensor (first) and the right side impact sensor (second); replace the floor wire harness, then clear the DTC.

41. Reconnect the negative cable to the 12 volt battery.

42. Turn the ignition switch to ON (II), then wait for 10 seconds.

43. Measure the voltage between body ground and the floor wire harness 2P connector (right side impact sensor (second)) terminals No. 1 and No. 2 individually. There should be less than 0.2 V.

Is the voltage as specified?

YES -

Go to step 44.

NO -

Short to power in the floor wire harness between the right side impact sensor (first) and the right side impact sensor (second); replace the floor wire harness, then clear the DTC.

44. Turn the ignition switch to LOCK (0).

45. Measure the resistance between the floor wire harness 4P connector (right side impact sensor (first)) terminal No. 1 and the floor wire harness 2P connector (right side impact sensor (second)) terminal No. 2, and between the floor wire harness 4P connector (right side impact sensor (first)) terminal No. 4 and the floor wire harness 2P connector (right side impact sensor (second)) terminal No. 1. There should be less than 1.0 Ohms.

Is the resistance as specified?

YES -

Disconnect and reconnect the connector, and then check DTC again. If the DTC is still present, replace the SRS unit Service and Repair.

NO -

Open in the floor wire harness between the right side impact sensor (first) and the right side impact sensor (second); replace the floor wire harness, then clear the DTC.

46. Turn the ignition switch to LOCK (0).

47. Check the connections between SRS unit connector B (39P) and the SRS unit, and between the floor wire harness 4P connector and the right side impact sensor (first) Side Impact Sensor (First) Replacement and between the floor wire harness 2P connector and right side impact sensor (second) Side Impact Sensor (Second) Replacement.

Are the connections OK?

YES -

Go to step 48.

NO -

Replace the floor wire harness, then clear the DTC.

48. Turn the ignition switch to ON (II).

49. Confirm with the HDS that the DTC for left side impact sensor is not stored.

50. Turn the ignition switch to LOCK (0).

51. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

52. Remove the left side impact sensor (first) Side Impact Sensor (First) Replacement, or prepare a known-good side impact sensor.

53. Exchange the right side impact sensor (first) for the impact sensor prepared in step 52.

54. Reconnect the negative cable to the 12 volt battery.

55. Clear the DTCs with the HDS.

56. Turn the ignition switch to ON (II), then wait for 10 seconds.

57. Check for DTCs with the HDS.

Is DTC 44-11 indicated?

YES -

Go to step 58.

NO -

Faulty right side impact sensor (first); replace the right side impact sensor (first) Side Impact Sensor (First) Replacement, then clear the DTC.

58. Turn the ignition switch to LOCK (0).

59. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

60. Disconnect SRS unit connector B (39P) from the SRS unit.

61. Disconnect the floor wire harness 4P connector from the right side impact sensor (first) Side Impact Sensor (First) Replacement.

62. Measure the resistance between the floor wire harness 4P connector (right side impact sensor (first)) terminals No. 2 and No. 3. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?

YES -

Go to step 63.

NO -

Short to another wire in the floor wire harness between the SRS unit and the right side impact sensor (first); replace the floor wire harness, then clear the DTC.

63. Measure the resistance between body ground and the floor wire harness 4P connector (right side impact sensor (first)) terminals No. 2 and No. 3 individually. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?

YES -

Go to step 64.

NO -

Short to ground in the floor wire harness between the SRS unit and the right side impact sensor (first); replace the floor wire harness, then clear the DTC.

64. Reconnect the negative cable to the 12 volt battery.

65. Turn the ignition switch to ON (II), then wait for 10 seconds.

66. Measure the voltage between body ground and the floor wire harness 4P connector (right side impact sensor (first)) terminals No. 2 and No. 3 individually. There should be less than 0.2 V.

Is the voltage as specified?

YES -

Go to step 67.

NO -

Short to power in the floor wire harness between the SRS unit and the right side impact sensor (first); replace the floor wire harness, then clear the DTC.

67. Turn the ignition switch to LOCK (0).

68. Measure the resistance between the floor wire harness 4P connector (left side impact sensor (first)) terminal No. 3 and SRS unit connector B (39P) terminal No. 38, and between the floor wire harness 4P connector (left side impact sensor (first)) terminal No. 2 and SRS unit connector B (39P) terminal No. 39. There should be less than 1.0 Ohms.