45-1x

SRS DTC Troubleshooting: 43-1x, 45-1x (x can be 0 thru 9 or A thru F)

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)

Special Tools Required

- SRS inflator simulator 07SAZ-TB4011A
- SRS simulator lead L 070AZ-SNAA300
NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures, Service and Repair General Troubleshooting Information, Initial Inspection and Diagnostic Overview and Battery Terminal Disconnection and Reconnection. Procedures

1. Clear the DTC memory. Initial Inspection and Diagnostic Overview

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

3. Read the DTC. Initial Inspection and Diagnostic Overview

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

NO - Go to step 4.


4. Read the DTC.

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

NO - Go to step 5.


5. Read the DTC.

Is DTC 43-11 indicated?
YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time.


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

7. Check for a damaged floor wire harness between SRS unit and left side impact sensor (first), left side impact sensor (first), and left side impact sensor (second).

Is the floor wire harness OK?
YES - Go to step 8.

NO - Replace the floor wire harness.


8. Disconnect the negative cable from the battery, then wait for 3 minutes.

9. Replace the left side impact sensor (first) with a known-good part. Side Impact Sensor (First) Replacement

10. Clear the DTC memory. Initial Inspection and Diagnostic Overview

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

12. Read the DTC. Initial Inspection and Diagnostic Overview

Is DTC 43-11 indicated?
YES - Go to step 13.

NO - Faulty left side impact sensor (first); replace the original left side impact sensor (first) Side Impact Sensor (First) Replacement.


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

14. Disconnect the negative cable from the battery, then wait for 3 minutes.

15. Replace the left side impact sensor (second) with a known-good part. Side Impact Sensor (Second) Replacement

16. Clear the DTC. Initial Inspection and Diagnostic Overview

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

18. Read the DTC. Initial Inspection and Diagnostic Overview

Is DTC 43-11 indicated?
YES - Go to step 19.

NO - Faulty left side impact sensor (second); replace the original left side impact sensor (second) Side Impact Sensor (Second) Replacement.


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

20. Disconnect the negative cable from the battery, then wait for 3 minutes.

21. Disconnect both seat belt tensioner 4P connectors. Service and Repair

22. Disconnect SRS unit connector B (28P) from the SRS unit. Service and Repair

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






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






25. Measure the resistance between the terminal No. 2 and No. 3 of the floor wire harness 4P connector. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Go to step 26.

NO - Short in the floor wire harness; replace the floor wire harness.






26. Measure the resistance between the terminal No.1 and No. 4 of the floor wire harness 4P connector. There should be an open circuit or at least 1MOhms.

Is the resistance as specified?
YES - Go to step 27.

NO - Short in the floor wire harness; replace the floor wire harness.






27. Measure the resistance between the terminal No. 2 of floor wire harness 4P connector and body ground, and between the terminal No. 3 and body ground. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Go to step 28.

NO - Short to ground in the floor wire harness; replace the floor wire harness.






28. Measure the resistance between the terminal No. 1 of floor wire harness 4P connector and body ground, and between the terminal No. 4 and body ground. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Go to step 29.

NO - Short to ground in the floor wire harness; replace the floor wire harness.






29. Reconnect the negative cable to the battery.

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

31. Measure the voltage between the terminal No. 2 of floor wire harness 4P connector and body ground, and between the terminal No.3 and body ground. There should be less than 0.2 V.

Is the voltage as specified?
YES - Go to step 32.

NO - Short to power in the floor wire harness; replace the floor wire harness.






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

33. Install a jumper wire between the terminal No. 25 and terminal No. 26 of the SRS unit connector B (28P).






34. Measure the resistance between the terminal No. 2 and No. 3 of the floor wire harness 4P connector. There should be less than 10 Ohms.

Is the resistance as specified?
YES - Go to step 35.

NO - Open in the floor wire harness; replace the floor wire harness.






35. Connect the SRS inflator simulator (jumper connector) and the black lead (A) of simulator lead L to the floor wire harness 2P connector (B).






36. Measure the resistance between the terminal No. 1 and No. 4 of the floor wire harness 4P connector. There should be less than 1.0 Ohms.

Is the resistance as specified?
YES - Reconnect the floor wire harness 4P connector to the left side impact sensor (first) and left side impact sensor (second). If the DTCs are still indicated, replace the SRS unit. SRS Unit Replacement

NO - Open in the floor wire harness; replace the floor wire harness.