Code No.3C, 3D,4C, 4D, 14, 15, 16, 31, 32, 45, 51, 52, 54, 55, 56, 57, 58, 59, 73, 74, 83, 84 system inside SRS-ECU


DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes 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:
Code No.
 Part/Circuit integral to SRS-ECU
 Trouble causes
3C
 Curtain air bag module (squib) (RH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
3D
  • Open circuit in the squib ignition drive circuit
4C
 Curtain air bag module (squib) (LH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
4D
  • Open circuit in the squib ignition drive circuit
14
 Analog G-sensor
  • 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
15
 Safing G-sensor (for frontal collision)
  • Short circuit in the safing G-sensor
16
  • Open circuit in the safing G-sensor
31
 Capacitor circuit
  • Voltage at the capacitor terminal is higher than the specified value for five seconds or more
32
  • Voltage at the capacitor terminal is lower than the specified value for five seconds or more (This is not detected if diagnosis code No.41 or 42 indicating battery positive voltage drop has been output).
45
 Non-volatile memory (EEPROM) and A/D converter
  • When the non-volatile memory (EEPROM) and A/D converter system are abnormal
51
 Driver’s air bag module (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
52
  • Open circuit in the squib ignition drive circuit
54
 Front passenger’s air bag module (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
55
  • Open circuit in the squib ignition drive circuit
56
 Driver’s seat belt pre-tensioner (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
57
  • Open circuit in the squib ignition drive circuit
58
 Passenger’s seat belt pre-tensioner (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
59
  • Open circuit in the squib ignition drive circuit
73
 Side air bag module (RH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
74
  • Open circuit in the squib ignition drive circuit
83
 Side air bag module (LH) (squib ignition drive circuit)
  • Short circuit in the squib ignition drive circuit
84
  • Open circuit in the squib ignition drive circuit

PROBABLE CAUSE

  • Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE
Replace the SRS-ECU (Refer to ).