Mitsubishi Motors Service Manual

2018 / ECLIPSE CROSS / EC - Workshop Manual

52 -INTERIOR AND SUPPLEMENTAL RESTRAINT SYSTEM(SRS) > 52B-SUPPLEMENTAL RESTRAINT SYSTEM (SRS) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > DTC B1433 SIDE-AIRBAG SQUIB (LH) DRIVE CIRCUIT (POWER SUPPLY SIDE) SHORTED

Code No.B1433 Side-airbag module (LH) (squib) system (shorted to squib circuit power supply)

caution

If the diagnosis code B1433 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 side-airbag module (squib) of impacted side.

TROUBLE JUDGEMENT

The code is set when the input terminal of SRS-ECU side-airbag module (squib) is shorted to power supply.

PROBABLE CAUSES

Damaged wiring harness and connectors
Side-airbag module (squib) harness shorted to power supply
Malfunction of SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-IIISE CAN bus diagnostics.

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. B1433 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 the negative battery terminal is connected, disconnect it.

(2) Disconnect the side-airbag module (LH) connector, unlock the connector by sliding the locking button to the direction of the arrow as shown in the figure, and then disconnect the connector.

(3) Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991866).

(4)

caution

Do not insert a probe directly into the terminal from the connector front side as the connector contact pressure may be weakened.

Insert the resistor harness probe from the back of side-airbag module (LH) 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 the diagnosis code No. B1433 set?

Go to Step 4.

Replace the front seat assembly (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)

danger

To release the connector short spring in the following operations, disconnect this side-airbag module connector, and keep the squib circuit shorted.

Disconnect the side-airbag module (LH) connector, unlock the connector by sliding the locking button to the direction of the arrow as shown in the figure, and then disconnect the connector.

(4)

caution

The 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 SLS-, SLS+ line and the short spring, and then 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 SLS-, SLS+ 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 SLS-, SLS+ line between the SRS-ECU connector and the side-airbag module (LH) connector.

STEP 5. Check whether the diagnosis code is set again.

Is the diagnosis code No. B1433 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