CODE NO. B1BC7 SRS-ECU (record data full) system

caution If the diagnosis code B1BC7 is set to SRS-ECU, be sure to diagnose the CAN bus line.


If SRS-ECU determines that a collision has occurred, it sends the ignition current to deploy the air bag. It stores the deployment status. If this code is set, SRS-ECU determines that the air bag has been deployed.


This code is set after the air bag deployment. If this code is set before the air bag is deployed, an internal failure may have occurred in SRS-ECU.


  • Malfunction of SRS-ECU


STEP 1. M.U.T.-III CAN bus diagnostics.

Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. Check whether the diagnosis code is reset.

(1)Connect the negative battery terminal.
(2)Check the diagnosis code again.
(3)Disconnect the negative battery terminal.

Q. Are any "Stored" or "Active" diagnosis code output?

Replace SRS-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).