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SRS - Troubleshooting 52B-21 OK <Check the circuit between the SRS-ECU and the front passenger’s air bag module> Measure at the C-21 SRS-ECU connector. Disconnect the SRS-ECU connector C-21. D Disconnect the front passenger’s air bag module connector C-109. Caution Disconnect the connector and short-circuit the squib circuit before releasing the short bar of the SRS-ECU connector in the following operation. D Cable bands between terminals 9, 10 and the short bar (width:3 mm, thickness:0.5 mm) between terminals 11 and 12 and the short bar, and release the short bar. (See Figure A.) Caution As the short bar may not be releasable if inserted insufficiently, insert more than 4 mm. D Measure at the harness side D Continuity check between terminals 9 and 10 Caution Do not directly insert a probe or other devices at the front of the connector to avoid a possible decrease in the contact pressure. OK: No continuity YES NO Replace the front passenger’s seat air bag module (squib). Resistor harness (MB991866) Dummy resistor (MB991865) resistance (3Ω) Instrumental panel wiring harness Front passenger’s air bag module connector <Check the front passenger’s air bag module (squib)> Connect the dummy resistor (MB991865) to the resistor harness (MB991866). D Disconnect the front passenger’s air bag module connector C-109 and insert the resistor harness (MB991866) behind the harness side connector. Caution Do not directly insert a probe or other devices at the front of the connector to avoid a possible decrease in the contact pressure. D Connect the negative (-) terminal of the battery D Check the diagnosis code again after erasing the memory. Is code No.24 output? Check the trouble symptoms. NG Check the harness between the front passenger’s air bag module and the SRS-ECU, and repair if necessary. NG YES NG Correct Check connector: C-21, C-109 Connector C-21 Figure A Terminal Short bar Front view of C-21 SRS-ECU connector (harness side). Cable band and etc. Section A - A 4 mm or more A A Replace the SRS-ECU. |