45-1x

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

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

No Signal From the Left Side Impact Sensor (first)

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

No Signal From the Left 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 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 Testing and Inspection, and retest.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then wait for 10 seconds.

3. Check for DTCs with the HDS.

Is DTC 45-1x (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. Check for DTCs with the HDS.

Is DTC 43-1x (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 5.

5. Check for DTCs with the HDS.

Is DTC 45-11 indicated?

YES -

Go to step 7.

NO -

Go to step 6.

6. Check for DTCs with the HDS.

Is DTC 43-11 indicated?

YES -

Go to step 35.

NO -

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

7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

8. Check for these connector connections and harness.

- SRS unit connector B (39P) and the SRS unit.
- Left side impact sensor (first) 4P connector on the floor wire harness Side Impact Sensor (First) Replacement.
- Left side impact sensor (second) 2P connector on the floor wire harness Side Impact Sensor (Second) Replacement.

Are the connections and harness OK?

YES -

Go to step 9.

NO -

Repair the poor connector connections or replace the harness, then clear the DTC, and retest.

- If poor connector connections are repaired, and DTC 45-11 is still present, go to step 9.
- If the harness is replaced, and DTC 45-11 is still present, replace the SRS unit Service and Repair.

9. Substitute a known-good left side impact sensor (second) Side Impact Sensor (Second) Replacement.

10. Reconnect the negative cable to the battery.

11. Clear the DTCs with the HDS.

12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then wait for 10 seconds.

13. Check for DTCs with the HDS.

Is DTC 45-11 indicated?

YES -

Go to step 14.

NO -

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

14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

15. Disconnect the negative cable from the battery, then wait at least 3 minutes.

16. Return the left side impact sensor (second) which was replaced in step 9.

17. Substitute a known-good left side impact sensor (first) Side Impact Sensor (First) Replacement.

18. Reconnect the negative cable to the battery.

19. Clear the DTCs with the HDS.

20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then wait for 10 seconds.

21. Check for DTCs with the HDS.

Is DTC 45-11 indicated?

YES -

Go to step 22.

NO -

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

22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

23. Disconnect the negative cable from the battery, then wait at least 3 minutes.

24. Return the left side impact sensor (first) which was replaced in step 17.

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

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

27. Disconnect the left side impact sensor (second) 2P connector on the floor wire harness Side Impact Sensor (Second) Replacement.

28. Measure the resistance between left side impact sensor (second) 2P connector on the floor wire harness 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 29.

NO -

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

29. Measure the resistance between body ground and left side impact sensor (second) 2P connector on the floor wire harness 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 30.

NO -

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

30. Reconnect the negative cable to the battery.

31. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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

Is the voltage as specified?

YES -

Go to step 33.

NO -

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

33. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

34. Measure the resistance between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 1 and left side impact sensor (second) 2P connector on the floor wire harness terminal No. 2, and between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 4 and left side impact sensor (second) 2P connector on the floor wire harness 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 left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.

35. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

36. Check for these connector connections and harness.

- SRS unit connector B (39P) and the SRS unit.
- Left side impact sensor (first) 4P connector on the floor wire harness Side Impact Sensor (First) Replacement.
- Left side impact sensor (second) 2P connector on the floor wire harness Side Impact Sensor (Second) Replacement.

Are the connections and harness OK?

YES -

Go to step 37.

NO -

Repair the poor connector connections or replace the harness, then clear the DTC, and retest.

- If poor connector connections are repaired, and DTC 43-11 is still present, go to step 37.
- If the harness is replaced, and DTC 43-11 is still present, replace the SRS unit Service and Repair.

37. Substitute a known-good left side impact sensor (first) Side Impact Sensor (First) Replacement.

38. Reconnect the negative cable to the battery.

39. Clear the DTCs with the HDS.

40. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then wait for 10 seconds.

41. Check for DTCs with the HDS.

Is DTC 43-11 indicated?

YES -

Go to step 42.

NO -

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

42. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

43. Disconnect the negative cable from the battery, then wait at least 3 minutes.

44. Return the left side impact sensor (first) which was replaced in step 37.

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

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

47. Measure the resistance between left side impact sensor (first) 4P connector on the floor wire harness 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 48.

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.

48. Measure the resistance between body ground and left side impact sensor (first) 4P connector on the floor wire harness 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 49.

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.

49. Reconnect the negative cable to the battery.

50. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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

Is the voltage as specified?

YES -

Go to step 52.

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.

52. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

53. Measure the resistance between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 2 and SRS unit connector B (39P) terminal No. 37, and between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 3 and SRS unit connector B (39P) terminal No. 36. There should be less than 1.0 Ohms.