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SRS AIR BAG DIAGNOSIS SUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-72 DTC B1412: Passenger’s (Front) Air Bag Module (1st Squib) System Fault for Power Supply Circuit CAUTION If DTC B1412 is set in the SRS-ECU, always diag- . 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 This DTC is set if there is abnormal resistance . TROUBLESHOOTING HINTS • Damaged harness wires and connectors • Short to the power supply in the passenger's air bag module (squib) harness • Malfunction of the SRS-ECU • Refer to circuit diagrams GROUP- • Refer to configuration diagrams GROUP- . DIAGNOSIS Required Special Tools: • MB991958: diagnostic 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 resistor • MB991866: Resistor harness 52DB017A C-110 (Y) FRONT DECK CONNECTOR: C-110 24DB062A CONNECTOR: C-121 C-121 (Y) SRS-ECU 42 31 38 27 21 41 28 39 22 30 25 47 36 33 44 34 45 37 48 26 29 23 40 32 43 35 46 24 B A C-121 INSTRUMENT HARNESS CONNECTOR (REAR VIEW) |