B1427

This document has been updated per Mitsubishi TSB# 06-52b-001



DTC B1427: Side Impact Sensor (RH) Power Supply Circuit System

Side Impact Sensor (RH) Circuit:

CIRCUIT OPERATION
The side impact sensor includes an analog G-sensor and CPU, etc. The CPU monitors the analog G-sensor output signal. If the CPU judges that the side-air-bags should be deployed, it sends a fire signal to the SRS-ECU to deploy the side-airbags. Besides that, the CPU diagnoses the internal components of the side impact sensor. If a malfunction occurs, it requests the SRS-ECU to set a diagnostic trouble code.

DTC SET CONDITIONS
This DTC is set if the power supply voltage of the side impact sensor (RH) drops below the rated value for a continuous period of five seconds or more.

TROUBLESHOOTING HINTS
- Damaged wiring harnesses or connectors
- Malfunction of the side-airbag module (RH) (squib)
- Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A

STEP 1. Check the side impact sensor (RH) power supply circuit at the side impact sensor D-02.

1. Disconnect the negative battery terminal.




2. Disconnect side impact sensor (RH) connector D-02, and measure at the wiring harness side.
3. Connect the negative battery terminal.
4. Turn the ignition switch to the "ON" position.

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




5. Measure the voltage between the D-02 harness connector terminal 2 and body ground.
A wave pattern of oscilloscope iterates an amplitude of 6 -12 volts.

Q: Is the check result normal?

YES: Replace the side impact sensor (RH). Then go to Step 3.

NO: Go to Step 2.










STEP 2. Check the harness wires for open circuit or short circuit between SRS-ECU connector C-27 (terminal No.63 and 64) and side impact sensor (RH) connector D-02 (terminal No.1 and 2).

NOTE: After inspecting intermediate connector C-112, inspect the wiring harness. If the intermediate connector C-112 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 3.

Q: Are the harness wires between SRS-ECU connector C-27 (terminal No.63 and 64) and side impact sensor (RH) connector D-02 (terminal No.1 and 2) in good condition?

YES: Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1427 sets, replace the SRS-ECU. Then go to Step 3.

NO: Repair the harness wires between SRS-ECU connector C-27 and side impact sensor (RH) connector D-02. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code.




Check again if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC B1427 set?

YES: Return to Step 1.

NO: The procedure is complete.