Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC
1. Turn the ignition switch to the ON position, and wait for at least 10 seconds.
2. Check for DTCs (See DTC CHECK / CLEAR ).
  Result:
  
  A:
  
  DTCs B1771 and B1795 are output.
  
  B:
  
  DTC B1795 is output.
  
  HINT:
  
  Codes other than DTCs 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.
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.

Fig 1: Identifying O3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

STANDARD VOLTAGE SPECIFICATIONS

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

STANDARD RESISTANCE SPECIFICATIONS

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 (See REMOVAL ).
  HINT:
  
  Perform the inspection using parts from a normal vehicle if possible.
PERFORM ZERO POINT CALIBRATION
1. Connect the negative (-) terminal cable to the battery.
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to the ON position.
4. Using the intelligent tester, perform "zero point calibration" (See INITIALIZATION ).
  OK:
  
  "COMPLETED" is displayed.
PERFORM SENSITIVITY CHECK
1. Using the intelligent tester, perform "sensitivity check" (See INITIALIZATION ).
  Standard values:
  
  27 to 33 kg (59.52 to 72.75 lb)
NEXT: END