Toyota Tacoma (2015-2018) Service Manual: Light Sensor Circuit Malfunction (B1244)
DESCRIPTION
This DTC is output when a failure of the automatic light control sensor circuit is detected.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1244 |
When either condition below is met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration
(See page .gif)
).*1
- *1: w/ Smart Key System
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Clear the DTC (See page ).
(b) Recheck for DTC (See page ).
OK:
DTC B1244 is not output.
| OK | .gif) |
USE SIMULATION METHOD TO CHECK |
|
.gif)
|
2. |
READ VALUE USING TECHSTREAM (LIGHT SENSOR ILLUMINANCE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) According to the display on the Techstream, read the Data List.
Main Body|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Light Sensor Illuminance |
Light control sensor illuminance / 0 to 8191 lx |
Value is output according to ambient light level |
- |
OK:
Output illuminance is as shown in table above.
| OK | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
|
3. |
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LIGHT CONTROL SENSOR VOLTAGE) |
|
(a) Disconnect the ECU connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
19 (CLTB) - 21 (CLTE) |
Ignition switch ON |
11 to 14 V |
|
Ignition switch OFF |
Below 1 V |
|
*a |
Component without harness connected (Main Body ECU (Multiplex Network Body ECU)) |
| NG | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
|
4. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - AUTOMATIC LIGHT CONTROL SENSOR) |
(a) Disconnect the M6 main body ECU (multiplex network body ECU) connector.
(b) Disconnect the A37 automatic light control sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
M6-19 (CLTB) - A37-1 (CLTB) |
Always |
Below 1 Ω |
|
M6-20 (CLTS) - A37-4 (CLTS) |
||
|
M6-21 (CLTE) - A37-2 (CLTE) |
||
|
M6-19 (CLTB) - Body ground |
Always |
10 kΩ or higher |
|
M6-20 (CLTS) - Body ground |
||
|
M6-21 (CLTE) - Body ground |
| OK | |
REPLACE AUTOMATIC LIGHT CONTROL SENSOR |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
Text in Illustration
*1
Main Body ECU (Multiplex Network Body ECU)
-
-
(a ...
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows values or states of switches,
sensors, actuators and other items to be read without removing any parts ...
Other materials:
Evaporator Temperature Sensor Circuit (B1413/13)
DESCRIPTION
The cooler thermistor sensor (evaporator temperature sensor) is installed on
the evaporator in the air conditioner unit to detect the temperature of the cooled
air that has passed through the evaporator and is used to control the air conditioning.
It sends signals to the air condi ...
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
The ECM of this system is connected to the CAN communication system.
Therefore, before starting troubleshooting, make sure to check that there
is no trouble in the CAN and multiplex communication system.
*: Use the Techstream.
PROCEDURE
...
Output Speed Sensor Circuit Short to Battery (P072012,P072014,P072031)
DESCRIPTION
This sensor detects the rotation speed of the transmission output shaft and sends
signals to the ECM. By comparing the input turbine speed signal (NT) with the output
shaft speed sensor signal (SP2), the ECM detects the shift timing of the gears and
appropriately controls the engi ...
