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












OPERATION



TROUBLE JUDGEMENT



PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. Check the side impact sensor (LH).
(1)Check that the negative auxiliary battery terminal is disconnected. If the negative auxiliary battery terminal is connected, disconnect it.
(2)Alternate the side impact sensor (LH) and the side impact sensor (RH), and then install the alternated sensor.
(3)Connect the negative auxiliary battery terminal.
(4)After erasing the diagnosis code memory, check the diagnosis code again.
(5)Disconnect the negative auxiliary battery terminal.

Q. Is diagnosis code B1428 or B1429 set?
Replace the side impact sensor (LH) with a new one. (Refer to ). Go to Step 3.
Go to Step 2

STEP 2. Wiring harness check between the C-19 side impact sensor connector (LH) terminal No. 1/2 and the B-113 SRS-ECU connector terminal No. 16/15.

  • Wiring harness check for open and short circuit between right side impact sensor and SRS-ECU

Q. Is the check result normal?

Go to Step 3
Repair the wiring harness.

STEP 3. Check whether the diagnosis code is reset.

Q. Is diagnosis code B1438 or B1439 set?
Replace the SRS-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).