Code No.B1438 Side impact sensor (LH) communication error
Code No.B1439 Side impact sensor (LH) communication impossible


caution If the diagnosis code B1438 or B1439 is set to SRS-ECU, be sure to diagnose the CAN bus line.

OPERATION



DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Damaged wiring harnesses or connectors
  • Malfunction of the side impact sensor (LH)
  • 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 54C, 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 side impact sensor (LH).
(1)Disconnect the negative battery terminal.
(2)Alternate the side impact sensor (LH) and the side impact sensor (RH), and then install the alternated sensor.
(3)Connect the negative battery terminal.
(4)Erase diagnosis code from memory, and check the diagnosis code.

Q. Is diagnosis code B1438 or B1439 set?
Replace the side impact sensor (LH) with a new one (Refer to ). Go to Step 5.
Go to Step 4.

STEP 4. Check of short to power supply, short to earth, and open circuit in SSL+, SSL- line in between SRS-ECU connector and side impact sensor (LH) connector.

Q. Is the check result normal?
Go to Step 5.
Repair the connectors or harness wires.

STEP 5. Check whether the diagnosis code is reset.

Q. Is diagnosis code B1438 or B1439 set?
Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).