B2-1x

SRS DTC Troubleshooting: 43-1x, 45-1x, B2-1x

DTC 43-1x ("x" can be 0 thru 9 or A thru F):

No Signal From the Left Side Impact Sensor (first) ('10 model)

DTC 45-1x ("x" can be 0 thru 9 or A thru F):

No Signal From the Left Side Impact Sensor (second) ('10 model)

DTC B2-1x ("x" can be 0 thru 9 or A thru F):

No Signal From the Rear Safing Sensor ('10 model)

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 SRS Unit Update 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 45-xx (except 45-11) indicated?

YES -

Faulty left side impact sensor (second); replace the left 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 B2-xx (except B2-11) indicated?

YES -

Faulty rear safing sensor; replace the rear safing sensor Service and Repair, 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 43-xx (except 43-11) indicated?

YES -

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

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 43-11 indicated?

YES -

Go to step 19.

NO -

Go to step 13.

13. Clear the DTCs with the HDS.

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

15. Check for DTCs with the HDS.

Is DTC B2-11 indicated?

YES -

Go to step 48.

NO -

Go to step 16.

16. Clear the DTCs with the HDS.

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

18. Check for DTCs with the HDS.

Is DTC 45-11 indicated?

YES -

Go to step 69.

NO -

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

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

20. Check the connections between SRS unit connector B (39P) and the SRS unit, and between the floor wire harness 4P connector and the left side impact sensor (first) Side Impact Sensor (First) Replacement, and between the floor wire harness 4P connector and rear safing sensor Service and Repair, and between the driver's side wire harness 2P connector and the left side impact sensor (second) Side Impact Sensor (Second) Replacement.

Are the connections OK?

YES -

Go to step 21.

NO -

Replace the faulty wire harness, then clear the DTC.�

21. Confirm that the DTC for right side impact sensor is not stored.

22. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes, and remove the right impact sensor, or prepare a known-good side impact sensor.

23. Exchange the left side impact sensor (first) for the impact sensor prepared in step 22.

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

25. Clear the DTCs with the HDS.

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

27. Check for DTCs with the HDS.

Is DTC 43-11 indicated?

YES -

Go to step 28.

NO -

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

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

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

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

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

32. Disconnect the floor wire harness 4P connector from the rear safing sensor Service and Repair.

33. Measure the resistance between the floor wire harness 4P connector (left 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 34.

NO -

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

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

Is the resistance as specified?

YES -

Go to step 35.

NO -

Short to another wire in the floor wire harness between the left side impact sensor (first) and the rear safing sensor; replace the floor wire harness, then clear the DTC.�

35. Measure the resistance between body ground and the floor wire harness 4P connector (left 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 36.

NO -

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

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

Is the resistance as specified?

YES -

Go to step 37.

NO -

Short to ground in the floor wire harness between the left side impact sensor (first) and the rear safing sensor; replace the floor wire harness, then clear the DTC.�

37. Disconnect the driver's side wire harness 2P connector from the left side impact sensor (second) Side Impact Sensor (Second) Replacement.

38. Measure the resistance between body ground and the driver's side wire harness 2P connector (left 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 39.

NO -

Short to ground in the floor wire harness or the driver's side wire harness between the rear safing sensor and the left side impact sensor (second); replace the floor wire harness or the driver's side wire harness, then clear the DTC.�

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

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

41. Measure the voltage between body ground and the floor wire harness 4P connector (left 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 42.

NO -

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

42. Measure the voltage between body ground and the floor wire harness 4P connector (left side impact sensor (first)) terminals No. 1 and No. 4, individually. There should be less than 0.2 V.

Is the voltage as specified?

YES -

Go to step 43.

NO -

Short to power in the floor wire harness between the left side impact sensor (first) and the rear safing sensor; replace the floor wire harness, then clear the DTC.�

43. Measure the voltage between body ground and the floor wire harness 4P connector (rear safing sensor) terminals No. 1 and No. 4, 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 or the driver's side wire harness between the rear safing sensor and the left side impact sensor (second); replace the floor wire harness or the driver's side wire harness, then clear the DTC.�

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

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

46. Install a jumper wire between SRS unit connector B (39P) terminals No. 36 and No. 37.

47. Measure the resistance between the floor wire harness 4P connector (left side impact sensor (first)) terminals No. 2 and No. 3. 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 SRS Unit Replacement.�

NO -

Open in the floor wire harness between the SRS unit and the left side impact sensor (first); replace the floor wire harness, then clear the DTC.�

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

49. Check the connections between SRS unit connector B (39P) and the SRS unit, and between the floor wire harness 4P connector and the left side impact sensor (first) Side Impact Sensor (First) Replacement, and between the floor wire harness 4P connector and rear safing sensor Service and Repair, and between the driver's side wire harness 2P connector and the left side impact sensor (second) Side Impact Sensor (Second) Replacement.

Are the connections OK?

YES -

Go to step 50.

NO -

Replace the faulty wire harness, then clear the DTC.�

50. Confirm that the DTC for right side impact sensor is not stored.

51. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes, and remove the right impact sensor, or prepare a known-good side impact sensor.

52. Exchange the left side impact sensor (first) for the impact sensor prepared in step 51.

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

54. Clear the DTCs with the HDS.

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

56. Check for DTCs with the HDS.

Is DTC B2-11 indicated?

YES -

Go to step 57.

NO -

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

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

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

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

60. Disconnect the floor wire harness 4P connector from the rear safing sensor Service and Repair.

61. Disconnect the driver's side wire harness 2P connector from the left side impact sensor (second) Side Impact Sensor (Second) Replacement.

62. Measure the resistance between the driver's side wire harness 2P connector (left 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 63.

NO -

Short to another wire in the floor wire harness or the driver's side wire harness between the rear safing sensor and the left side impact sensor (second); replace the floor wire harness or the driver's side wire harness, then clear the DTC.�

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

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

65. Measure the voltage between body ground and the driver's side wire harness 2P connector (left side impact sensor (second)) terminals No. 1 and No. 2. There should be less than 0.2 V.

Is the voltage as specified?

YES -

Go to step 66.

NO -

Short to power in the floor wire harness or the driver's side wire harness between the rear safing sensor and the left side impact sensor (second); replace the floor wire harness or the driver's side wire harness, then clear the DTC.�

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

67. Install a jumper wire between floor wire harness 4P connector (left side impact sensor (first)) terminals No. 1 and No. 4.

68. Measure the resistance between floor wire harness 4P connector (rear safing sensor) terminals No. 2 and No. 3. There should be less than 1.0 Ohms.

Is the resistance as specified?

YES -

Faulty rear safing sensor; replace the rear safing sensor Service and Repair, then clear the DTC. If the problem is still present, replace the SRS unit SRS Unit Replacement.�

NO -

Open in the floor wire harness between the left side impact sensor (first) and the rear safing sensor; replace the floor wire harness, then clear the DTC.�

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

70. Check the connections between SRS unit connector B (39P) and the SRS unit, and between the floor wire harness 4P connector and the left side impact sensor (first) Side Impact Sensor (First) Replacement, and between the floor wire harness 4P connector and rear safing sensor Service and Repair, and between the driver's side wire harness 2P connector and the left side impact sensor (second) Side Impact Sensor (Second) Replacement.

Are the connections OK?

YES -

Go to step 71.

NO -

Replace the faulty wire harness, then clear the DTC.�

71. Confirm that the DTC for right side impact sensor is not stored.

72. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes, and remove the right impact sensor, or prepare a known-good side impact sensor.

73. Exchange the left side impact sensor (second) for the impact sensor prepared in step 72.

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

75. Clear the DTCs with the HDS.

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

77. Check for DTCs with the HDS.

Is DTC 45-11 indicated?

YES -

Go to step 78.

NO -

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

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

79. Substitute a known-good left side impact sensor (first) and recheck.

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

81. Clear the DTCs with the HDS.

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

83. Check for DTCs with the HDS.

Is DTC 45-11 indicated?

YES -

Go to step 84.

NO -

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

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

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

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

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

88. Disconnect the floor wire harness 4P connector from the rear safing sensor Service and Repair.

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

Is the resistance as specified?

YES -

Go to step 90.

NO -

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

90. Disconnect the driver's side wire harness 2P connector from the left side impact sensor (second) Side Impact Sensor (Second) Replacement.

91. Measure the resistance between the floor wire harness 4P connector (rear safing sensor) terminals No. 2 and No. 4. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?

YES -

Go to step 92.

NO -

Short to another wire in the floor wire harness or the driver's side wire harness between the rear safing sensor and the left side impact sensor (second); replace the floor wire harness or the driver's side wire harness, then clear the DTC.�

92. Install a jumper wire between the floor wire harness 4P connector (rear safing sensor) terminals No. 1 and No. 4.

93. Measure the resistance between the driver's side wire harness 2P connector (left side impact sensor (second)) terminals No. 1 and No. 2. There should be less than 1.0 Ohms.