DESCRIPTION
The automatic light control sensor detects ambient light, converts it into an electrical signal, and outputs it to the main body ECU. The main body ECU turns on or off the headlights and taillights according to the signal.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1244 |
|
|
WIRING DIAGRAM
PROCEDURE
1. |
CHECK FOR DTC |
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
OK:
DTC B1244 output does not occur.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
2. |
READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR) |
(a) Using the Techstream, read the Data List (See page
).
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Illumination Rate Info |
Illumination rate information / 0 ms. to 99.99 ms. |
Value is output according to ambient light levels |
- |
OK:
Normal condition listed above is displayed.
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
3. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) |
(a) Disconnect the F9 main body ECU connector.
(b) Disconnect the G2 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 |
---|---|---|
F9-22 (CLTE) - G2-3 (CLTE) |
Always |
Below 1 Ω |
F9-21 (CLTS) - G2-5 (CLTS) |
Always |
Below 1 Ω |
F9-20 (CLTB) - G2-6 (CLTB) |
Always |
Below 1 Ω |
F9-22 (CLTE) - Body ground |
Always |
10 kΩ or higher |
F9-21 (CLTS) - Body ground |
Always |
10 kΩ or higher |
F9-20 (CLTB) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Reconnect the F9 main body ECU connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F9-20 (CLTB) - F9-22 (CLTE) |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
*a |
Component with harness connected (Main Body ECU) |
NG | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
5. |
CHECK AUTOMATIC LIGHT CONTROL SENSOR |
(a) Reconnect the G2 automatic light control sensor connector. |
|
(b) Connect an oscilloscope to the automatic light control sensor connector.
(c) Check the waveform. OK:
HINT: If the ambient light becomes brighter, width A becomes narrower. |
|
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG | ![]() |
REPLACE AUTOMATIC LIGHT CONTROL SENSOR |
ECU Power Source Circuit
DESCRIPTION
This is the power source for the tire pressure warning ECU.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the tire pressure warning ECU, read the IDs stored in
the old ECU using the Techstream and write them down ...
Dcm Operation History
DCM OPERATION HISTORY
1. DCM OPERATION HISTORY
This function shows the telematics network status when the DCM (Telematics Transceiver)
was operated. Use this function when no DTC is stored but the telematics system
is unable to connect to the call center ...