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DTC B1404: Driver's air bag module (1st squib ignition drive circuit) system detected short circuit
DTC B1405: Driver's air bag module (1st squib ignition drive circuit) system detected open circuit DTC B1414: Passenger’s (front) air bag module (1st squib ignition drive circuit) system detected short circuit
DTC B1415: Passenger’s (front) air bag module (1st squib ignition drive circuit) system detected open circuit
DTC B1424: Side-airbag module (RH) (squib) activating circuit short-circuited
DTC B1425: Side-airbag module (RH) (squib) activating circuit open-circuited
DTC B1434: Side-airbag module (LH) (squib) activating circuit short-circuited
DTC B1435: Side-airbag module (LH) (squib) activating circuit open-circuited
DTC B1444: Curtain air bag module (RH) (squib) activating circuit short-circuited
DTC B1445: Curtain air bag module (RH) (squib) activating circuit open-circuited
DTC B1454: Curtain air bag module (LH) (squib) activating circuit short-circuited
DTC B1455: Curtain air bag module (LH) (squib) activating circuit open-circuited
DTC B1466: Analog G-sensor malfunction
DTC B1478: SRS-ECU backup capacitor circuit voltage too High
DTC B1479: SRS-ECU backup capacitor circuit voltage too Low
DTC B1484: Driver's air bag module (2nd squib ignition drive circuit) system detected short circuit
DTC B1485: Driver's air bag module (2nd squib ignition drive circuit) system detected open circuit
DTC B1494: Passenger’s (front) air bag module (2nd squib ignition drive circuit) system detected short circuit
DTC B1495: Passenger’s (front) air bag module (2nd squib ignition drive circuit) system detected open circuit
DTC B1496: SRS-ECU non-volatile memory (EEPROM)
DTC B1497: SRS-ECU application specific integrated circuit (for frontal activation)
DTC B1498: SRS-ECU abnormal condition in ROM or RAM
DTC B1547: Passenger’s air bag cut off activating circuit
DTC B1557: SRS-ECU application specific integrated circuit
DTC B1588: SRS-ECU backup capacitor system (Up converter unit)
DTC B1589: SRS-ECU backup capacitor system (Down converter unit)
DTC B1590: SRS-ECU backup capacitor system (capacitance big)
DTC B1591: SRS-ECU backup capacitor system (capacitance small)
DTC B1594: SRS-ECU application specific integrated circuit (for side activation)
DTC B1607: Seat belt pre-tensioner (driver’s side) (squib) activating circuit short-circuited
DTC B1608: Seat belt pre-tensioner (driver’s side) (squib) activating circuit open-circuited
DTC B1618: SRS-ECU safing G-sensor (Z axis low G-sensor failure)
DTC B1623: Lap pre-tensioner (LH) (squib) activating circuit short-circuited
DTC B1624: Lap pre-tensioner (LH) (squib) system activating circuit open-circuited
DTC B1629: Lap pre-tensioner (RH) (squib) activating circuit short-circuited
DTC B1630: Lap pre-tensioner (RH) (squib) system activating circuit open-circuited
DTC B1635: Knee air bag (squib) activating circuit short-circuited
DTC B1636: Knee air bag module (squib) activating circuit open-circuited
DTC B1674: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit short-circuited
DTC B1675: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit open-circuited
 
 
DTC SET CONDITIONS
  • These DTC are set when a fault is detected in the SRS-ECU. The most likely causes for this code to be set are shown in the table below:
PROBABLE CAUSE
  • Malfunction of the SRS-ECU
Code No.Part/Circuit integral to SRS-ECUTrouble causes
B1404Driver's air bag module (1st squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1405
  • Open circuit in the squib ignition drive circuit
B1414Passenger's (front) air bag module (1st squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1415
  • Open circuit in the squib ignition drive circuit
B1424Side-airbag module (RH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1425
  • Open circuit in the squib ignition drive circuit
B1434Side-airbag module (LH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1435
  • Open circuit in the squib ignition drive circuit
B1444Curtain air bag module (RH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1445
  • Open circuit in the squib ignition drive circuit
B1454Curtain air bag module (LH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1455
  • Open circuit in the squib ignition drive circuit
B1466Analog G-sensor (front air bag)
  • When the analog G-sensor is not operating
  • When the characteristics of the analog G-sensor are abnormal
  • When the output from the analog G-sensor is abnormal
B1478Capacitor
  • Voltage at the capacitor terminal is higher than the specified value for five seconds or more
B1479
  • Voltage at the capacitor terminal is lower than the specified value for five seconds or more (This is not detected if DTC B1476 indicating battery positive voltage drop has been set).
B1484Driver's air bag module (2nd squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1485
  • Open circuit in the squib ignition drive circuit
B1494Passenger's (front) air bag module (2nd squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1495
  • Open circuit in the squib ignition drive circuit
B1496Non-volatile memory (EEPROM)
  • When EEPROM communication error occurs
B1497Application specific integrated circuit (for frontal activation)
  • When the application specific integrated circuit (frontal activation) are abnormal
B1498ROM or RAM
  • When the ROM or RAM are abnormal
B1547Passenger’s air bag cut off activating circuit (squib ignition drive circuit)
  • Cut OFF (squib ignition drive circuit)
B1557Application specific integrated circuit
  • When the application specific integrated circuit are abnormal
B1588Backup capacitor systemBackup capacitor up converter
B1589Backup capacitor down converter
B1590Backup capacitor capacitance big
B1591Backup capacitor capacitance small
B1594Application specific integrated circuit (for side activation)
  • When the application specific integrated circuit (side activation) are abnormal
B1607Seat belt pre-tensioner (driver side) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1608
  • Open circuit in the squib ignition drive circuit
B1618SRS-ECU Safing G-sensor (Z axis low G-sensor)Z axis and Y axis low G-sensor failure
B1623Lap pre-tensioner (LH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B16324
  • Open circuit in the squib ignition drive circuit
B1629Lap pre-tensioner (RH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1630
  • Open circuit in the squib ignition drive circuit
B1635Knee air bag module (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1636
  • Open circuit in the squib ignition drive circuit
B1674Seat belt pre-tensioner (passenger side) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1675
  • Open circuit in the squib ignition drive circuit
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the scan tool ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Are the DTCs set?
Replace the SRS-ECU (Refer to ).
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).