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 Battery Terminal Disconnection and Reconnection Procedures.
1. Clear the DTC memory.
2. Turn the ignition switch to ON (II), then wait for 10 seconds.
3. Read the DTC.
Is DTC B2-11 indicated?
YES -
Go to step 4.
NO -
Go to step 5.
4. Read the DTC.
Is DTC 45-11 also indicated?
YES -
Faulty rear safing sensor; replace the rear safing sensor Service and Repair, then clear the DTC.�
NO -
Go to step 7.
5. Read the DTC.
Is DTC B2-1x (except B2-11) also indicated?
YES -
Go to step 6.
NO -
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.�
6. Read the DTC.
Is DTC 45-11 also indicated?
YES -
Troubleshoot the DTC 45-1x 45-1x.�
NO -
Faulty rear safing sensor; replace the rear safing sensor Service and Repair, then clear the DTC.�
7. Turn the ignition switch to LOCK (0).
8. Disconnect the negative cable from the battery, then wait at least 3 minutes.
9. Disconnect the floor wire harness 4P connector (A) from the rear safing sensor Service and Repair.
10. Disconnect the floor wire harness 4P connector (A) from the left side impact sensor (first) Side Impact Sensor (First) Replacement.
11. Measure the resistance between floor wire harness 4P connector (rear safing sensor) 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 12.
NO -
Short to another wire in the floor wire harness; replace the floor wire harness, then clear the DTC.�
12. Measure the resistance between floor wire harness 4P connector (rear safing sensor) terminal No. 2 and body ground. There should be an open circuit or at least 1 MOhms.
Is the resistance as specified?
YES -
Go to step 13.
NO -
Short to ground in the floor wire harness; replace the floor wire harness, then clear the DTC.�
13. Measure the resistance between floor wire harness 4P connector (rear safing sensor) 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 14.
NO -
Short to ground in the floor wire harness; replace the floor wire harness, then clear the DTC.�
14. Turn the ignition switch to ON (II).
15. Measure the voltage between floor wire harness 4P connector (rear safing sensor) terminal No. 2 and body ground. There should be less than 0.2 V.
Is the voltage as specified?
YES -
Go to step 16.
NO -
Short to power in the floor wire harness; replace the floor wire harness, then clear the DTC.�
16. Measure the voltage between floor wire harness 4P connector (rear safing sensor) terminal No. 3 and body ground. There should be less than 0.2 V.
Is the voltage as specified?
YES -
Go to step 17.
NO -
Short to power in the floor wire harness; replace the floor wire harness, then clear the DTC.�
17. Turn the ignition switch to LOCK (0).
18. Connect the red terminal of SRS simulator lead L (A) to the SRS inflator simulator (jumper connector), and then connect SRS simulator lead L to the floor wire harness 4P connector (B).
19. Measure the resistance between floor wire harness 4P connector (rear safing sensor) terminals No. 2 and No. 3. There should be less than 1.0 Ohms.
Is the resistance as specified?
YES -
Faulty rear safing sensor or poor connection at the floor wire harness 4P connector and the rear safing sensor. Check the connection between the connector and the rear safing sensor. If the connection is OK, replace the rear safing sensor Service and Repair, then clear the DTC, and retest. If the DTC is still present, replace the SRS unit SRS Unit Replacement.�
NO -
Open in the floor wire harness; replace the floor wire harness, then clear the DTC.�