Toyota Tacoma (2015-2018) Service Manual: Occupant Classification ECU Malfunction (B1795)
DESCRIPTION
DTC B1795 is set when a malfunction is detected in the occupant detection ECU.
Troubleshoot DTC B1771 first when both DTCs B1771 and B1795 are present.
|
DTC No. |
DTC Detections Conditions |
Trouble Areas |
|---|---|---|
|
B1795 |
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 B1795 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
.gif)
).
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:
DTC B1795 is not output.
HINT:
DTCs other than B1795 may be output at this time, but they are not related to this check.
| OK | .gif) |
USE SIMULATION METHOD TO CHECK |
|
.gif)
|
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:
Perform the inspection using parts from a normal vehicle when possible.
|
|
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:
"Zero Point Calibration is complete." is displayed on the Techstream.
|
|
4. |
PERFORM SENSITIVITY CHECK |
(a) Using the Techstream, perform the sensitivity check (See page
).
Standard :
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
| NEXT | |
END |
Open in Occupant Classification ECU Battery Positive Line (B1794)
DESCRIPTION
DTC B1794 is set when a malfunction is detected in the occupant detection ECU.
DTC No.
DTC Detections Conditions
Trouble Areas
B1794
...
Rear Occupant Classification Sensor LH Collision Detection (B1787)
DESCRIPTION
DTC B1787 is set when the occupant detection ECU receives a collision detection
signal, which is sent by the occupant classification sensor rear LH when an accident
occurs.
DTC B1787 ...
Other materials:
Reassembly
REASSEMBLY
PROCEDURE
1. INSTALL NO. 2 ANTENNA CORD SUB-ASSEMBLY
(a) Using hot-melt glue, install the No. 2 antenna cord sub-assembly as shown
in the illustration.
2. INSTALL NO. 1 ROOF WIRE (w/ Vanity Light)
(a) w/ EC Mirror:
(1) Align the aiming tape as shown in the illustration.
...
Downhill Assist Control system
The downhill assist control system helps to prevent excessive speed on steep
downhill descents.
■ System operation
The system will operate when the vehicle is traveling under 15 mph (25 km/h)
and the front-wheel drive control switch is in the L4 position.
Press the DAC switch. The ind ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If a trouble code is output during the DTC check, inspect the trouble areas listed
for that code. For details of the code, refer to "See page" in the DTC chart.
Wireless Door Lock Control System
DTC Code
Detection Item
...
