Lexus NX: Occupant Classification ECU Malfunction (B1795)
DESCRIPTION
DTC B1795 is stored when a malfunction is detected in the occupant detection ECU.
Troubleshoot DTC B1771 first when both DTCs B1771 and B1795 are present.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1795 | Occupant Classification ECU Malfunction | Occupant detection ECU malfunction. | Occupant detection ECU |
HINT:
- When DTC B1650/32 is stored as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1795 of the occupant classification system.
- Use the Techstream to check for DTCs of the occupant detection ECU, otherwise the DTCs cannot be read.
CAUTION / NOTICE / HINT
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.
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PROCEDURE
| 1. | CHECK DTC |
(a) Turn the power switch on (IG), and wait for at least 60 seconds.
(b) Clear the DTCs.
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HINT:
- First clear the DTCs stored in the occupant detection ECU, and then clear the DTCs stored in the airbag ECU assembly.
- Use the Techstream to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.
(c) Turn the power switch off.
(d) Turn the power switch on (IG), and wait for at least 60 seconds.
(e) Check for DTCs.
Click here
HINT:
DTCs other than DTC B1795 may be output at this time, but they are not related to this check.
| DTC B1795 is not output | .gif) | USE SIMULATION METHOD TO CHECK |
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| 2. | REPLACE OCCUPANT DETECTION ECU |
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
(c) Replace the occupant detection ECU.
Click here
HINT:
Perform the inspection using parts from a normal vehicle when possible.
|
| 3. | PERFORM ZERO POINT CALIBRATION |
(a) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
(b) Turn the power switch on (IG).
(c) Perform the zero point calibration.
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|
| 4. | PERFORM SENSITIVITY CHECK |
(a) Perform the sensitivity check.
Click here
Standard:
27 to 33 kg (59.5 to 72.8 lb)
| NEXT | | END (OCCUPANT DETECTION ECU WAS DEFECTIVE) |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the automatic high beam system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage wit
