[ 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 B1443 CURTAIN AIR BAG SQUIB (RH) DRIVE CIRCUIT (POWER SUPPLY SIDE) SHORTED
Code No.B1443 Curtain air bag module (RH) (squib) system (shorted to squib circuit power supply)
 
 
cautionIf the diagnosis code B1443 is set to SRS-ECU, be sure to diagnose the CAN bus line.
 
 
OPERATION
In case of side collision, when the impact exceeding the threshold is applied to the vehicle, and when the impact is simultaneously detected (turned ON) by the side impact sensor as well as by the analogue G-sensor in SRS-ECU, the electric current is supplied from SRS-ECU to the curtain air bag module (squib) of impacted side.
 
 
TROUBLE JUDGEMENT
The code is set when the SRS-ECU curtain air bag module (squib) is shorted to power supply.
 
 
PROBABLE CAUSES
  • Damaged wiring harness and connector
  • Curtain air bag module (squib) harness shorted to power supply
  • Malfunction of SRS-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostic.
Use 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 - Troubleshooting ).
 
STEP 2. Check whether the diagnosis code is set again.
(1) Connect the negative battery terminal.
(2) After erasing the diagnosis code memory, check the diagnosis code again.
(3) Disconnect the negative battery terminal.
Is the diagnosis code No. B1443 set?
Go to Step 3.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 3. Diagnosis check by dummy resistor connection
(1) Check that the negative battery terminal is disconnected. If connected, disconnect the negative battery terminal.
 
(2) Use the flat-tipped screwdriver to pull out the locking button of curtain air bag module (RH) connector to the direction of the arrow. After releasing the lock, disconnect the connector.
 
(3) Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884).
(4) Connect the special tool resistor harness to the curtain air bag module (RH) harness side connector.
(5) Connect the negative battery terminal.
(6) After erasing the diagnosis code memory, check the diagnosis code again.
(7) Disconnect the negative battery terminal.
Is diagnosis code No. B1443 set?
Go to step 4.
Replace the curtain air bag module (RH) (Refer to .)
 
STEP 4. Voltage measurement at the SRS-ECU connector.
(1) Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(2) Disconnect the SRS-ECU connector.
 
(3)
dangerTo release SRS-ECU wiring harness side connector short spring in the following operations, disconnect curtain air bag module connector in advance, and keep the squib circuit shorted.
Use the flat-tipped screwdriver to pull out the locking button of curtain air bag module (RH) connector to the direction of the arrow. After releasing the lock, disconnect the connector.
 
(4)
cautionThe short spring may not be released due to the insufficient insertion. Therefore, insert the insulator for 4 mm or more.
Insert an insulator (width: 3 mm, thickness: 0.5 mm) such as cable tie between the CRS-, CRS+ line and the short spring, and release the short spring.
(5) Connect the negative battery terminal.
(6) Ignition switch: ON
(7) Take the measurements below at the SRS-ECU harness side connector.
  • Voltage between CRS-, CRS+ line and body earth
OK: 1 V or less
(8) Disconnect the negative battery terminal.
Is the check result normal?
Go to Step 5.
Repair the wiring harness CRS-, CRS+ line between the SRS-ECU connector and the curtain air bag module (RH) connector.
 
STEP 5. Check whether the diagnosis code is set again.
Is the diagnosis code No. B1443 set?
Replace SRS-ECU (Refer to ).
Intermittent Malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).