B2-1x

SRS DTC Troubleshooting: B2-1x

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

No Signal From the Rear Safing Sensor

Special Tools Required

- SRS Inflator Simulator 07SAZ-TB4011A
- SRS Simulator Lead L 070AZ-SNAA300

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 Testing and Inspection 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 B2-1x indicated?

YES -

Go to step 4.

NO -

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

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

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

6. Check the connections between SRS unit connector B (39P) and the SRS unit, and between the floor wire harness 2P connector and the rear safing sensor Service and Repair.

Are the connections OK?

YES -

Go to step 7.

NO -

Replace the floor wire harness, then clear the DTC.

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

8. Disconnect the floor wire harness 2P connector from the rear safing sensor Service and Repair.

9. Measure the resistance between SRS unit connector B (39P) terminals No. 26 and No. 27. There should be an open circuit or at least 1 MOhms.





Is the resistance as specified?

YES -

Go to step 10.

NO -

Short another wire in the floor wire harness; replace the floor wire harness, then clear the DTC.

10. Measure the resistance between body ground and SRS unit connector B (39P) terminals No. 26 and No. 27 individually. There should be an open circuit or at least 1 MOhms.





Is the resistance as specified?

YES -

Go to step 11.

NO -

Short to ground in the floor wire harness; replace the floor wire harness, then clear the DTC.

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

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

13. Measure the voltage between body ground and SRS unit connector B (39P) terminals No. 26 and No. 27 individually. There should be less than 0.2 V.





Is the voltage as specified?

YES -

Go to step 14.

NO -

Short to power in the floor wire harness; replace the floor wire harness, then clear the DTC.

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

15. Connect the black terminals (A) of simulator lead L to the SRS inflator simulator (jumper connector), and then connect the SRS simulator lead L to the floor wire harness 2P connector (B).






16. Measure the resistance between SRS unit connector B (39P) terminals No. 26 and No. 27. There should be less than 1.0 Ohms.





Is the resistance as specified?

YES -

Faulty rear safing sensor or SRS unit; replace the rear safing sensor Service and Repair, then clear the DTC, and retest. If the DTC is still present, replace the SRS unit Service and Repair.

NO -

Open in the floor wire harness; replace the floor wire harness, then clear the DTC.