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SRS AIR BAG DIAGNOSIS TSB Revision SUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-93 CAUTION If DTC B1411 <1st squib> or B1491 <2nd squib> . CIRCUIT OPERATION • The SRS-ECU judges how severe a collision is by detecting signals from the front impact sensors • The ignition signal is input to the air bag module via the clock spring to inflate the air bag. . DTC SET CONDITIONS . TROUBLESHOOTING HINTS • Open circuit in the passenger's air bag module (squib) circuit • Improper connector contact • Malfunction of the SRS-ECU . DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A (Vehicles with CAN Communication System) • MB991865: Dummy resister • MB991866: Resister harness AC305362 CONNECTOR: C-121 C-121 (Y) AD SRS-ECU |