Code No.B1B70 Malfunction of G-sensor inside left front impact sensor
Code No.B1B71 Malfunction of G-sensor inside right front impact sensor


caution If the diagnosis code B1B70 or B1B71 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 left front impact sensor (with code No. B1B70)
  • Malfunction of right front impact sensor (with code No. B1B71)

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 (LH) {In case of code B1B70 (Regardless of "Active" or "Stored" faults)} with new part.

  • Replace the front impact sensor (RH) {In case of code B1B71 (Regardless of "Active" or "Stored" faults)} 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 No. B1B70 or B1B71 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. B1B70 or B1B71 set?
Return to Step 1.
The procedure is complete.