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 ).*1
PROCEDURE
1. |
CHECK FOR DTC |
(a) Clear the DTC (See page ).
(b) Recheck for DTC (See page ).
OK:
DTC B1244 is not output.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
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 |
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT REAR AIRBAG SENSOR (for Vehicle not Involved in Collision)
(a) Perform a diagnostic system check (See page
).
2. INSPECT REAR AIRBAG SENSOR (for Vehicle Involved in Collision and Airbag has
not Deployed)
CAUTION:
For rear airbag sensor removal and ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the
table. Check each sy ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY
(a) When there is a malfunction such as noise from a speaker or no sound at all,
replace the speaker with a new one and check that the malfunction disappears.
OK:
Malfunction disappears.
HINT:
Connect the connectors to th ...