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SRS - Troubleshooting 52B-17 <RS> <Check the circuit between the SRS-ECU and clock spring> Measure at the SRS-ECU connector C-21 and the clock spring connector C-204. Disconnect the SRS-ECU connector C-21 and the clock spring connector C-204 and measure at the harness side. D Continuity check between the following terminals Connector C-204 11 – 2 12 – 1 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: Continuity (2Ω or less) NG Correct Check connector: C-21, C-204 OK Check the trouble symptoms. NG Check the harness between the clock spring and the SRS-ECU, and repair if necessary. NG Connector C-21 Connector 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.22 output? YES Check the clock spring (Refer to P.52B-59.) NO YES Replace the clock spring. Replace the driver’s air bag module (squib). NO Replace the SRS-ECU. OK Resistor harness (MB991866) Clock spring harness side connector C-204 Dummy resistor (MB991865) resistance (3Ω) |