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SRS - Troubleshooting 52B-33 Code No.43 SRS warning lamp drive circuit system (lamp does not illuminate) Possible Cause This code is output when open circuit has occurred in the SRS warning lamp drive circuit for 5 seconds or more. However, if the code is output due to open circuit faulty, code No.43 is automatically erased and the SRS warning lamp functions normally as soon as a normal operation is resumed. D Harness or connector fault D Bulb fault D SRS-ECU inoperable D Combination meter fault NG NG NG OK NG NG OK Check the trouble symptoms. NG Correct Check the harness between the SRS-ECU, the combination meter, and the ignition switch IG 1. OK Replace the SRS-ECU. Correct Correct OK Check connector: C-21, C-213, C-29, C-01, C-02 Check the SRS warning lamp. Connect the negative (-) terminal of the battery D Ignition switch: ON D Does the lamp illuminate when the SRS-ECU connector C-21 is disconnected? OK: Lamp illuminates. Check the bulb. Replace the combination meter. OK Correct Check the harness between the SRS-ECU and the ignition switch IG 1 . Code No.43 SRS warning lamp drive circuit system (Lamp does not go out) Probable cause Harness between SRS warning lamp and SRS-ECU is being shorted to earth However, once trouble is extinguished, this code will be automatically erased, and SRS warning lamp will go out. D Harnesses or connector fault D SRS-ECU inoperable D Combination meter fault NO OK NG NG NG Replace combination meter. Check the SRS warning lamp. Connect negative (–) battery terminal. D Ignition switch: ON D Does lamp go out when combination meter connector C-02 is disconnected? YES Check the following connectors: C-02, C-21 Check trouble symptoms. OK Replace the SRS-ECU. Check the wiring harness between SRS-ECU and combination meter . Repair Repair NG Code No.44 SRS warning lamp drive circuit system Probable cause Short is present in SRS warning lamp drive circuit, or output transistor in SRS-ECU is defective. However, once trouble is extinguished, this code will be automatically erased, and SRS warning lamp will go out. D Harnesses or connector fault D SRS-ECU inoperable Check the SRS warning lamp drive circuit system. (Refer to P.52B-33.) OK Replace the SRS-ECU. |