Code No.B1B72 Malfunction of G-sensor inside left side impact sensor
Code No.B1B75 Malfunction of G-sensor inside right side impact sensor


caution If the diagnosis code B1B72 or B1B75 is set to SRS-ECU, be sure to diagnose the CAN bus line.

TROUBLE JUDGEMENT

  • 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 (with code No. B1B72)
  • Malfunction of right side impact sensor (with code No. B1B75)

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 {In case of code B1B72 (Regardless of "Active" or "Stored" faults)} with the new part.

  • Replace the right side impact sensor {In case of code B1B75 (Regardless of "Active" or "Stored" faults)} with the new part.
(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. B1B72 or B1B75 set?
Go to Step 3.
The procedure is complete.

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)After erasing the diagnosis code memory, check the diagnosis code again.
(5)Disconnect the negative battery terminal.

Q. Is the diagnosis code No. B1B72 or B1B75 set?
Return to Step 1.
The procedure is complete.