Code No.B1406 Malfunction of G-sensor inside right front impact sensor
Code No.B1416 Malfunction of G-sensor inside left front impact sensor


caution If the diagnosis code B1406 or B1416 is set to SRS-ECU, be sure to diagnose the CAN bus line.

TROUBLE JUDGEMENT



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

PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of right front impact sensor (with code No. B1406)
  • Malfunction of left front impact sensor (with code No. B1416)

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

  • Replace the front impact sensor with 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 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 set?
Return to Step 1.
The procedure is complete.