[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
52 -INTERIOR AND SUPPLEMENTAL RESTRAINT SYSTEM(SRS) > 52B-SUPPLEMENTAL RESTRAINT SYSTEM (SRS) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > DTC B1438 SIDE IMPACT SENSOR (LH) COMMUNICATION ERROR
Code No.B1438 Side impact sensor (LH) communication error
Code No.B1439 Side impact sensor (LH) communication impossible
 
 
cautionIf the diagnosis code B1438 or B1439 is set to SRS-ECU, be sure to diagnose the CAN bus line.
 
 
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.
 
 
DIAGNOSIS CODE SET CONDITIONS
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. M.U.T.-IIISE CAN bus diagnostics
Use the M.U.T.-IIISE to diagnose the CAN bus lines.
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 set again.
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 set again.
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.
Is diagnosis code B1438 or B1439 set?
Replace the side impact sensor (LH) with a new one (Refer to ).
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.
Is the check result normal?
Go to Step 5.
Repair the connectors or harness wires.
 
STEP 5. Check whether the diagnosis code is set again.
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 ).