Code No.3E: Curtain air bag module (squib) (RH) system (short-circuited to the power supply)

OPERATION

The SRS-ECU judges how severe a collision is by detecting signals from the side impact sensors and the side air bag safing G-sensor. If the impact is over a predetermined level, the SRS-ECU outputs an ignition signal. At this time, if the side air bag safing G-sensor is on, the curtain air bag module will deploy.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the curtain air bag module squib (RH) wire(s) are short-circuited to the power supply.

PROBABLE CAUSES

Damaged wiring harnesses or connectors
Short to the power supply in the curtain air bag module (squib) (RH) harness
Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the diagnosis code by connecting a dummy resistor (M.U.T.-III diagnosis code).

(1)Disconnect the negative battery terminal.

(2)Disconnect curtain air bag module connector G-04. Use a flat-tipped screwdriver to pull out the locking button at the harness side connector, and then disconnect the connector.

(3)Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884).
(4)Connect special tool (MB991884) to the G-04 harness side connector.
(5)Connect the negative battery terminal.
(6)Erase diagnosis code memory, and check the diagnosis code.

Q. Is diagnosis code 3E set?

Go to Step 2.

Replace the curtain air bag module (Refer to

STEP 2. Voltage measurement at the SRS-ECU connector C-146 (M.U.T.-III diagnosis code).

(1)Disconnect the negative battery terminal.

(2)Disconnect SRS-ECU connector C-146.

(3)Disconnect curtain air bag module connector G-04. Use a flat-tipped screwdriver to pull out the locking button at the harness side connector, and then disconnect the connector.
(4)Turn the ignition switch to the "ON" position.

(5)

caution

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

Voltage measurement between C-146 harness side connector terminals 29, 30 and body earth.
OK: 0 V

Q. Is the check result normal?

Go to Step 3.

Repair the harness wire between SRS-ECU connector C-146 (terminal No.29 and 30) and curtain air bag module connector G-04 (terminal No.1and 2).

STEP 3. Check whether the diagnosis code is reset.

Q. Is diagnosis code 3E set?

	Replace the SRS-ECU (Refer to ).

	An intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points ).