Code No.B1408: Front impact sensor (RH) communication error
Code No.B1409: Front impact sensor (RH) communication impossible












caution If diagnosis code B1408 or B1409 is set in the SRS-ECU, always diagnose the CAN main bus line.

OPERATION



DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Damaged wiring harnesses or connectors
  • Malfunction of the front impact sensor (RH)
  • Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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 54D, Diagnosis ).

STEP 2. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Ignition: "LOCK" (OFF) position to "ON"
(3)On completion, check that the diagnosis code is not reset.

Q. Is the diagnosis code set?
Go to Step 3.
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

STEP 3. Check the front impact sensor (RH).
(1)Disconnect the negative battery terminal.
(2)Alternate the front impact sensor (RH) and the front impact sensor (LH), and then install the alternated sensor.
(3)Connect the negative battery terminal.
(4)Erase the diagnosis code from memory, and check the diagnosis code.

Q. Is diagnosis code B1418 or B1419 set?
Replace the front impact sensor (RH) with a new one. (Refer to ). Go to Step 5.
Go to Step 4.

STEP 4. Check the harness wires for open circuit and short circuit between SRS-ECU connector D-24 (terminal No.47 and 48) and front impact sensor (RH) connector A-37 (terminal No.2 and 1).
note After inspecting intermediate connector D-231 inspect the wiring harness. If the intermediate connector D-231 is damaged, repair or replace it.

Q. Is the check result normal?

Go to Step 5.
Repair the harness wires between SRS-ECU connector D-24 (terminal No.47 and 48) and front impact sensor (RH) connector A-37 (terminal No.2 and 1).

STEP 5. Check whether the diagnosis code is reset.

Q. Is diagnosis code B1408 or B1409 set?
Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).