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TROUBLESHOOTING SUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-56 Code No.B1413 Passenger’s (Front) Air Bag Module (1st Squib) System Fault for Power Supply CAUTION If diagnosis code B1413 <1st squib> or B1493 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. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set if there is abnormal PROBABLE CAUSES • Damaged harness wires and connectors • Short to the power supply in the passenger's air bag module (squib) harness • Malfunction of the SRS-ECU DIAGNOSIS PROCEDURE STEP 1. MUT-III CAN bus diagnostics Use the MUT-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus line (Refer to GROUP STEP 2. Recheck for diagnosis code. Check again if the diagnosis code is set. not reset. AIR BAG MODULE SRS-ECU CONNECTOR Wire colour code : CONNECTOR NOTE Passenger's (Front) Air Bag Module (1st Squib and 2nd Squib) Circuit |