Code No.B1438:
Side impact sensor (LH) communication error Code No.B1439: Side impact sensor (LH)
communication impossible
OPERATION
The side impact sensor transmits acceleration data to the SRS-ECU. The SRS-ECU then determines.
if the side and/or curtain air bags should be inflated, and then sends an ignition
signal. The side impact sensor also diagnoses itself, and sends a diagnosis code to the SRS-ECU
if a problem occurs.
TROUBLE JUDGEMENT
The diagnosis code is set if the communication between the left side impact sensor and
SRS-ECU is abnormal (No. B1438), or impossible (No. B1439).
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 ).
)
)
)
)
)
Replace the side impact sensor (LH) with a new one. (Refer to 
).
Go to Step 3.
Go to Step 2