B1795

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1795: Occupant Classification ECU Malfunction

DTC B1795 - Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.
Troubleshoot DTC B1771 first when the DTCs B1771 and B1795 are output simultaneously.





HINT: When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system, perform troubleshooting for DTC B1795 of the occupant classification system.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC
(a) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(b) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.
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 -- Continue to next step.

2. CHECK FUSE
(a) Measure the resistance of the ECU-B fuse.
Resistance:
Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

3. CHECK WIRE HARNESS (SOURCE VOLTAGE)




(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery.
(c) Disconnect the connector from the occupant classification ECU.
(d) Connect the negative (-) terminal cable to the battery.
(e) Turn the ignition switch to the ON position.
(f) Measure the voltage according to the value(s) in the table below.
Voltage:





(g) Turn the ignition switch to the LOCK position.
(h) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

4. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery.
(c) Replace the occupant classification ECU Removal.

HINT: Perform the inspection using parts from a normal vehicle if possible.

NEXT -- Continue to next step.

5. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the Techstream, perform "Zero point calibration" Programming and Relearning.
OK:
"Zero Point Calibration is Complete." is displayed.
NEXT -- Continue to next step.

6. PERFORM SENSITIVITY CHECK
(a) Using the Techstream, perform "Sensitivity check" Programming and Relearning.
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END