CODE NO. B1B73 Malfunction of G-sensor inside left side impact sensor (rear)
CODE NO. B1B76 Malfunction of G-sensor inside right side impact sensor (rear)


caution If the diagnosis code B1B73 or B1B76 is set to SRS-ECU, be sure to diagnose the CAN bus line.

TROUBLE JUDGMENT

  • Analogue G-sensor for side impact does not operate.
  • Characteristics of analogue G-sensor for side impact are abnormal.
  • Output of analogue G-sensor for side impact is abnormal.

PROBABLE CAUSES

  • Malfunction of left side impact sensor (rear) (with code No. B1B73)
  • Malfunction of right side impact sensor (rear) (with code No. B1B76)

DIAGNOSIS PROCEDURE

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. Side impact sensor check.
(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(2)A side impact sensor is checked in the following way.

  • Replace the left side impact sensor (rear) {In case of code B1B73 (Regardless of "Active" or "Stored" faults)} with the new parts.

  • Replace the right side impact sensor (rear) {In case of code B1B76 (Regardless of "Active" or "Stored" faults)} with the new parts.
(3)Connect the negative battery terminal.
(4)After erasing the diagnosis code memory, check the diagnosis code again.
(5)Disconnect the negative battery terminal.

Q. Is the diagnosis code No. B1B73 or B1B76 set?
Go to Step 3.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

STEP 3. SRS-ECU check.
(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(2)Replace the SRS-ECU with a new one (Refer to ).
(3)Connect the negative battery terminal.
(4)Check the diagnosis code again.
(5)Disconnect the negative battery terminal.

Q. Is the diagnosis code No. B1B73 or B1B76 set?
Return to Step 1.
The procedure is complete.