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SRS - Troubleshooting 52B-13 <RS> NG <Check the circuit between the SRS-ECU and clock spring> Measure at the SRS-ECU connector C-21. Disconnect the SRS-ECU connector C-21. D Release the the clock spring connector C-204. 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 11, 12 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 11 and 12 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 Check connector: C-21, C-204 <Clock spring check> Release the clock spring connector (2-pin) C-204. D Connect the dummy resistor (MB991865) to the resistor harness (MB991866). D Insert the resistor harness (MB991866) behind the harness side connector C-204. 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.21 output? Resistor harness (MB991866) C-204 clock spring harness side connector YES Dummy resistor (MB991865) resistance (3Ω) Check the clock spring (Refer to P.52B-59.) NO YES Replace the clock spring. Replace the driver’s air bag module (squib). NO Check the harness between the clock spring and the SRS-ECU, and repair if necessary. Check the trouble symptoms. Correct OK NG NG Replace the SRS-ECU. OK Figure A Terminal Short bar Front view of SRS-ECU connector C-21 (harness side) Cable band and etc. Section A - A 4 mm or more A A Connector C-21 |