DTC B1795: Occupant Classification ECU Malfunction: Procedure

CHECK DTC
1. Turn the ignition switch to the ON position, and wait for at least 10 seconds.
2. Check the DTCs. Refer to DTC CHECK / CLEAR .
  Result
  
  A
  
  DTCs B1771 and B1795 are output.
  
  B
  
  DTC B1795 is output.
  
  HINT:
  
  Codes other than DTC B1771 and B1795 may be output at this time, but they are not related to this check.
A → GO TO DTC B1771

B: Go to next step
CHECK FUSE
1. Measure the resistance of the ECU-B fuse.
  Standard resistance
  
  Below 1 Ω
NG → REPLACE FUSE

OK: Go to next step

CHECK WIRE HARNESS (SOURCE VOLTAGE)

Turn the ignition switch to the LOCK position.

Fig 1: Identifying O3 Occupant Classification ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the negative (-) terminal cable from the battery.
Disconnect the connector from the occupant classification ECU.
Connect the negative (-) terminal cable to the battery.
Turn the ignition switch to the ON position.

Measure the voltage according to the value(s) in the table below.

Standard voltage

Tester connection	Condition	Specified condition
O3-1 (+B) - Body ground	Always	10 to 14 V
O3-7 (IG) - Body ground	Ignition switch ON	10 to 14 V

Turn the ignition switch to the LOCK position.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester connection	Condition	Specified condition
O3-3 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE WIRE HARNESS

OK: Go to next step

REPLACE OCCUPANT CLASSIFICATION ECU
1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery.
3. Replace the occupant classification ECU. Refer to REMOVAL .
  HINT:
  
  Perform the inspection using parts from a normal vehicle if possible.
NEXT: Go to next step
PERFORM ZERO POINT CALIBRATION
1. Connect the negative (-) terminal cable to the battery.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to the ON position.
4. Using the Techstream, perform "Zero point calibration". Refer to INITIALIZATION .
  OK
  
  "Zero Point Calibration is complete." is displayed.
NEXT: Go to next step
PERFORM SENSITIVITY CHECK
1. Using the Techstream, perform "Sensitivity check". Refer to INITIALIZATION .
  Standard value
  
  27 to 33 kg (59.52 to 72.75 lb)
NEXT → END