DTC Troubleshooting: 43-1x

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

Special Tools Required
SRS inflator simulator (  07SAZ-TB4011A)
 

SRS simulator lead L (  070AZ-SNA0300)
 


1.Erase the DTC memory.

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

3.Read the DTC.

Is DTC 43-11 indicated?


YES - Go to 6.


NO - Go to 4.


4.Read the DTC.

Is DTC 43-12 indicated?


YES - Go to 5.


NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures. If DTC 43-1x except DTC 43-11 and 43-12 is indicated, faulty left side impact sensor (first); replace the left side impact sensor (first).n

5.Read the DTC.

Is DTC 45-11 indicated?


YES - Faulty left side impact sensor (first); replace the left side impact sensor (first).n


NO - Go to 6.


6.Turn the ignition switch OFF.

7.Disconnect the negative cable from the battery, and wait for 3 minutes.

8.Disconnect both seat belt outer lap tensioner 4P connectors.

9.Disconnect the floor wire harness 4P connector (A) from the left side impact sensor (first).

 

10.Disconnect SRS unit connector B (28P) from the SRS unit.

11.Check resistance between the No. 25 and No. 26 terminals of SRS unit connector B (28P). There should be an open circuit or at least 1 MW.

 

Is the resistance as specified?


YES - Go to 12.


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


12.Check resistance between the No. 25 terminal of SRS unit connector B (28P) and body ground, and between the No. 26 terminal and body ground. There should be an open circuit or at least 1 MW.

 

Is the resistance as specified?


YES - Go to 13.


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

13.Reconnect the negative cable to the battery.

14.Turn the ignition switch ON (II).

15.Check for voltage between the No. 25 terminal of SRS unit connector B (28P) and body ground, and between the No. 26 terminal and body ground. There should be 1 V or less.

 

Is the voltage as specified?


YES - Go to 16.


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

16.Turn the ignition switch OFF.

17.Connect the SRS inflator simulator (jumper connector) and simulator lead L to the left side impact sensor 4P connector (A).

 

18.Check resistance between the No. 25 and No. 26 terminals of SRS unit connector B (28P). There should be 0-1.0 W.

 

Is the resistance as specified?


YES - Faulty left side impact sensor (first) or SRS unit; replace the left side impact sensor (first). If the problem is still present, replace the SRS unit.n


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