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 DTC B1771 and B1795 are output simultaneously.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) Turn the power switch ON (IG), and wait for at least 10 seconds.
(b) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:





HINT: DTCs other than DTC B1771 and B1795 may be output at this time, but they are not related to this check.

B -- GO TO DTC B1771
A -- Continue to next step.

2. CHECK FUSE (ECU-B)
(a) Check the ECU-B fuse from the instrument panel junction block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.

3. CHECK WIRE HARNESS (SOURCE VOLTAGE)




(a) Turn the power switch OFF.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect the floor wire No. 2 connector from the occupant classification ECU.
(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(e) Measure the voltage of the wire harness side connector.
Standard voltage:





(f) Turn the power switch OFF.
(g) Measure the resistance of the wire harness side connector.
Standard resistance:






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

4. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the power switch OFF.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Replace the occupant classification ECU.
NEXT -- Continue to next step.

5. PERFORM ZERO POINT CALIBRATION
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch ON (IG).
(d) Using the Techstream, perform the 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 the sensitivity check Programming and Relearning.
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END