From 03-2006 to 10-2006

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 the DTC B1771 first when the DTC B1771 and B1795 are output simultaneously.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK 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:
A
DTC 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) Check 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 power switch off.
(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 power switch on (IG).
(f) Measure the voltage according to the value(s) in the table below.
Standard voltage:
for Power seat
for Manual seat









(g) Turn the power switch off.
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:
for Power seat
for Manual seat









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 negative (-) terminal cable from the battery.
(c) Replace the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

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 intelligent tester to the DLC3.
(c) Turn the power switch on (IG).
(d) Using the intelligent tester, perform "zero point calibration" Programming and Relearning.
OK:
"COMPLETED" is displayed.
NEXT -- Continue to next step.
6. PERFORM SENSITIVITY CHECK
(a) Using the intelligent tester, perform "sensitivity check" Programming and Relearning.
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END