DTC 43-1x

DTC 43-1x (43-10 to 43-19, 43-1A to 43-1F): No Signal from Left Side Impact Sensor (1ST)

Special Tools Required
- SRS inflator simulator 07SAZ-TB4011A
- SRS simulator lead H 07YAZ-S3M100

1. Erase the DTC memory.
2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay an, and is DTC 43-1x indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC troubleshooting index.

3. Turn the ignition switch OFF. Disconnect the battery negative cable, and wait for 3 minutes.
4. Check the connection between the SRS left side subharness 2P connector and the driver's side impact sensor.

Is the connection OK?

YES - Go to step 5.

NO - Poor contact between the SRS left side subharness 2P connector and the left side impact sensor (1st); replace the left side impact sensor (1st) and/or the SRS left side subharness, as needed.




5. Disconnect both seat belt tensioner 2P connectors (A).




6. Disconnect the left side impact sensor (1st) 2P connector (A).
7. Disconnect SRS unit connector B (28P) from the SRS unit.




8. Check resistance between the No.19 and No.20 terminals of SRS unit connector B (28P). Then check resistance between the No.19 terminal and body ground and the No.20 terminal and body ground. There should be an open circuit, or at least 1 MOhm.

Is the resistance as specified?

YES - Go to step 9.

NO - Go to step 15.

9. Reconnect the battery negative cable.
10. Turn the ignition switch ON (II).




11. Check for voltage between the No.19 terminal of SRS unit connector B (28P) and body ground, and the 20 terminal and body ground. There should be 1 V or less.

Is the voltage as specified?

YES - Go to step 12.

NO - Go to step 17.

12. Turn the ignition switch OFF.




13. Connect the SRS inflator simulator (jumper connector) and simulator lead H to the SRS left side subharness 2P connector (A).




14. Check resistance between the No.19 and No.20 terminals of SRS unit connector B (28P). There should be 1 Ohm or less.

Is the resistance as specified?

YES - Faulty left side impact sensor (1st) or SRS unit. Replace the left side impact sensor (1st) if the problem is still present, replace the SRS unit.

NO - Go to step 21.




15. Disconnect the SRS main subharness 28P connector C803 (A) from SRS left side subharness connector C803 (B).




16. Check resistance between the No.19 and No.20 terminals of SRS unit connector B (28P). Then check resistance between the No.19 terminal and body ground and the No.20 terminal and body ground. There should be an open circuit, or at least 1 MOhm.

Is the resistance as specified?

YES - Short in or to ground the SRS main subharness; replace the SRS main subharness.

NO - Short in or to ground the SRS left side subharness; replace the SRS left side subharness.

17. Turn the ignition switch OFF.




18. Disconnect the SRS main subharness 28P connector C803 (A) from SRS left side subharness connector C803 (B).
19. Turn the ignition switch ON (II).




20. Check for voltage between the No.20 terminal of SRS unit connector B (28P) and body ground. There should be 1 V or less.

Is the resistance as specified?

YES - Short to power in the SRS left side subharness; replace the SRS left side subharness.

NO - Short to power in the SRS main subharness; replace the SRS main subharness.




21. Disconnect the SRS main subharness 28P connector C803 (A) from SRS left side subharness connector C803 (B).




22. Check resistance between the No.20 and No.21 terminals of the SRS left side subharness 28P connector C803. There should be 1 MOhm or less.

Is the resistance as specified?

YES - Faulty SRS main subharness; replace the SRS main subharness.

NO - Faulty SRS left side subharness; replace the SRS left side subharness.