Code No.B1404: Driver’s air bag module (squib) activating circuit short-circuited
Code No.B1405: Driver’s air bag module (squib) activating circuit open-circuited
Code No.B1414: Passenger’s (front) air bag module (1st squib) activating circuit short-circuited
Code No.B1415: Passenger’s (front) air bag module (1st squib) activating circuit open-circuited
Code No.B1466: Analogue G-sensor malfunction
Code No.B1478: SRS-ECU backup capacitor circuit voltage too High
Code No.B1479: SRS-ECU backup capacitor circuit voltage too Low
Code No.B1496: SRS-ECU non-volatile memory (EEPROM)
Code No.B1498: SRS-ECU abnormal condition in ROM or RAM
Code No.B1557: SRS-ECU application specific integrated circuit
Code No.B1607: Seat belt pre-tensioner (driver’s side) activating circuit short-circuited
Code No.B1608: Seat belt pre-tensioner (driver’s side) activating circuit open-circuited
Code No.B1613: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit short-circuited
Code No.B1614: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit open-circuited
Code No.B1616: SRS-ECU safing G-sensor (for front air bag electronic safing circuit failure)
Code No.B1623: Driver’s lap pre-tensioner (squib) activating circuit short-circuited
Code No.B1624: Driver’s lap pre-tensioner (squib) system activating circuit open-circuited
Code No.B1629: Front passenger’s lap pre-tensioner (squib) activating circuit short-circuited
Code No.B1630: Front passenger’s lap pre-tensioner (squib) system activating circuit open-circuited


caution If diagnosis codes is set in the SRS-ECU, always diagnose the CAN main bus line.

TROUBLE JUDGEMENT


These diagnosis code 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-ECU
 Trouble causes
B1404
 Driver’s air bag module (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1405
  • Open circuit in the squib ignition drive circuit
B1414
 Passenger’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
B1466
 Analogue 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
B1478
 Capacitor
  • 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 diagnosis code B1476 or B1477 indicating battery positive voltage drop has been set).
B1496
 Non-volatile memory (EEPROM)
  • When EEPROM communication error occurs
B1498
 ROM or RAM
  • When the ROM or RAM are abnormal
B1557
 Application specific integrated circuit
  • When the application specific integrated circuit are abnormal
B1607
 Seat 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
B1613
 Seat 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
B1616
 SRS-ECU safing G-sensor (for front air bag electronic)
Safing circuit failure
B1623
 Lap pre-tensioner (driver side) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1624
  • Open circuit in the squib ignition drive circuit
B1629
 Lap pre-tensioner (passenger side) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
B1630
  • Open circuit in the squib ignition drive circuit

DIAGNOSIS PROCEDURE
Replace the SRS-ECU.