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SRS - Troubleshooting 52B-41 INSPECTION CHART FOR TROUBLE SYMPTOMS Study the trouble symptoms and check according to the inspection procedure chart. Trouble Inspection procedure No(s). Reference page Communication with MUT-II is impossible. 1 52B-41 SRS warning lamp does not illuminate. See diagnosis code No.43. 52B-33 SRS warning lamp does not go out. See diagnosis code No.43, 44. 52B-33 INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS Inspection Procedure 1 Communication with MUT-II is impossible. Probable cause When communication with all systems is impossible, diagnosis circuit is suspected as faulty. When only communication with SRS air bags is impossible, open in diagnosis output circuit or power supply circuit including earth circuit may be present. D Harness, connector malfunction D SRS-ECU malfunction D MUT ROM pack unmatching OK Replace the SRS-ECU. NG NG Check the harness between the SRS-ECU and the ignition switch IG 1 , and repair if necessary. NO Check the MUT-II diagnosis circuit, and repair if necessary. OK Check the trouble symptoms. NG Correct NG Check the harness between the SRS-ECU and earth, and repair if necessary. OK Check the trouble symptoms. NG Correct OK OK Check the trouble symptoms. Check the harness between the SRS-ECU and the diagnosis connector, and repair if necessary. YES (1) NG Check connector: C-21 (2), (3) NG Check connector: C-21, C-213, C-210 <Check the SRS-ECU power supply circuit (including earth circuit)> Measure at the C-21 SRS-ECU connector. Disconnect the SRS-ECU connector C-21 and measure at the harness side. 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. (1) Continuity between terminal 7 and body earth D Connect the negative (-) terminal of the battery D Ignition switch:ON (2) Voltage between terminal 13 and body earth (3) Voltage between terminal 16 and body earth NG Correct Check connector: C-21, C-26, C-22 Is communication by MUT-II possible when the ignition switch is ON? NG <Check the SRS-ECU MUT-II communication circuit> Measure at the SRS-ECU connector C-21 and diagnosis connector C-22 . Disconnect SRS-ECU connector C-21 and measure at the harness side and diagnosis connector C-22. D Continuity check between the following terminals C-22 connector 20 – 7 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) Connector C-21 Connector C-22 Connector C-21 Connector C-21 |