Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Sleep Operation Failure of Occupant Classification ECU (B1796)

Toyota Tacoma 2015-2018 Service Manual / Supplemental Restraint Systems / Occupant Classification System / Sleep Operation Failure of Occupant Classification ECU (B1796)

DESCRIPTION

During sleep mode, the occupant detection ECU monitors the condition of each sensor while the ignition switch is off. In this mode, if the occupant detection ECU detects an internal malfunction, DTC B1796 is set.

DTC No.

DTC Detections Conditions

Trouble Areas

B1796

Occupant detection ECU malfunction

Occupant detection ECU

HINT:

  • When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, perform troubleshooting for DTC B1796 of the occupant classification system.
  • Use the Techstream to check for DTCs of the occupant detection ECU, otherwise the DTCs cannot be read.

PROCEDURE

1.

CHECK DTC

(a) Turn the ignition switch to the ON position.

(b) Clear any DTCs stored in the memory (See page ).

HINT:

  • First clear DTCs stored in the occupant detection ECU and then in the airbag sensor assembly.
  • Use the Techstream to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.

(c) Turn the ignition switch to the LOCK position, and wait for at least 10 seconds.

(d) Turn the ignition switch to the ON position.

(e) Using the Techstream, check for DTCs of the occupant detection ECU (See page OK: ).

OK:

DTC B1796 is not output.

HINT:

DTCs other than B1796 may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

REPLACE OCCUPANT DETECTION ECU

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Replace the occupant detection ECU (See page HINT: HINT: ).

HINT:

Perform the inspection using parts from a normal vehicle when possible.

NEXT

3.

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 the zero point calibration (See page OK: ).

OK:

"Zero Point Calibration is complete." is displayed on the Techstream.

NEXT

4.

PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform the sensitivity check (See page Standard : ).

Standard :

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

NEXT

END

Terminals Of Ecu
TERMINALS OF ECU 1. OCCUPANT DETECTION ECU Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification ...

Data List / Active Test
DATA LIST / ACTIVE TEST HINT: By accessing the Data List displayed by the Techstream, you can check values of switches and sensors without removing any parts. Reading the Data List as the first ...

Other materials:

Reassembly
REASSEMBLY PROCEDURE 1. INSTALL FRONT LOWER ARM BUSH NO. 1 (a) Install a new lower arm bush using SST, a press and steel plate. SST: 09631-12090 SST: 09631-32020 NOTICE: Push the lower arm bush in until the bush positioning protrusions come to the positions shown in the illustration. 2. ...

Removal
REMOVAL PROCEDURE 1. PRECAUTION NOTICE: After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before pr ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

В© 2011-2021 Copyright www.ttguide.net