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DTC B1404: Driver's air bag module (1st squib) activating circuit short-circuited
DTC B1405: Driver's air bag module (1st squib) activating circuit open-circuited
DTC B1414: Passenger's (front) air bag module (1st squib) activating circuit short-circuited
DTC B1415: Passenger's (front) air bag module (1st squib) activating circuit open-circuited
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: Analogue G-sensor system in the SRS-ECU (front air bag)
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 B1498: SRS-ECU abnormal condition in ROM or RAM
DTC B1557: SRS-ECU application specific integrated circuit
DTC B1607: Seat belt pre-tensioner (driver’s side) activating circuit short-circuited
DTC B1608: Seat belt pre-tensioner (driver’s side) activating circuit open-circuited
DTC B1613: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit short-circuited
DTC B1614: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit open-circuited
DTC B1616: SRS-ECU safing G-sensor (for front air bag electronic safing circuit failure)
DTC B1618: SRS-ECU safing G-sensor (Z axis low G-sensor failure)
DTC B1635: Driver's knee air bag module (squib) activating circuit short-circuited
DTC B1636: Driver's knee air bag module (squib) activating circuit short-circuited
 
 
cautionIf diagnostic trouble code is stored in the SRS-ECU, always diagnose the CAN main bus line.
 
 
DTC SET CONDITIONS
These DTC are stored when a fault is detected in the SRS-ECU. The most likely causes for this code to be stored are shown in the table below:
 
 
TROUBLESHOOTING HINTS
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
B1466Analogue G-sensor (front air bag)
  • When the analogue G-sensor is not operating
  • When the characteristics of the analogue G-sensor are abnormal
  • When the output from the analogue 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 diagnostic trouble code B1476 or B1477 indicating battery positive voltage drop has been stored).
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
B1498ROM or RAM
  • When the ROM or RAM are abnormal
B1557Application specific integrated circuit
  • When the application specific integrated circuit 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
B1613Seat belt pre-tensioner (passenger side) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1614
  • Open circuit in the squib ignition drive circuit
B1616SRS-ECU safing G-sensor (for front air bag electronic)
  • Safing circuit failure
B1618SRS-ECU safing G-sensor (Z axis low G-sensor)
  • Z axis low G-sensor failure
B1635Driver's knee air bag module (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1636
  • Open circuit in the squib ignition drive circuit
 
 
 
DIAGNOSIS
 
 
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). 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 ). Then go to Step 2.
 
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Are the DTCs stored?
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 ).