DESCRIPTION
The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Note |
---|---|---|---|---|
B1244 |
Light Sensor Circuit Malfunction |
Any of the following conditions is met:
|
|
- |
Vehicle Condition |
||||
---|---|---|---|---|
Pattern 1 |
Pattern 2 |
Pattern 3 |
||
Diagnosis Condition |
Ignition switch ON |
○ |
○ |
○ |
Malfunction Status |
Malfunction in automatic light control sensor |
○ |
- |
- |
Open in automatic light control sensor circuit |
- |
○ |
- |
|
Short in automatic light control sensor circuit |
- |
- |
○ |
|
Detection Time |
- |
- |
- |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
Click here
PROCEDURE
1. |
READ VALUE USING TECHSTREAM |
(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) Read the Data List according to the display on the Techstream.
Body Electrical > Main Body > Data List
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 |
- |
Tester Display |
---|
Light Sensor Illuminance |
OK:
Normal condition listed above is displayed.
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
|
2. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - AUTOMATIC LIGHT CONTROL SENSOR) |
(a) Disconnect the G1 automatic light control sensor connector.
(b) Disconnect the F15 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F15-21 (CLTE) - G1-2 (CLTE) |
Always |
Below 1 Ω |
F15-20 (CLTS) - G1-4 (CLTS) |
Always |
Below 1 Ω |
F15-19 (CLTB) - G1-1 (CLTB) |
Always |
Below 1 Ω |
F15-21 (CLTE) or G1-2 (CLTE) - Body ground |
Always |
10 kΩ or higher |
F15-20 (CLTS) or G1-4 (CLTS) - Body ground |
Always |
10 kΩ or higher |
F15-19 (CLTB) or G1-1 (CLTB) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Reconnect the F15 main body ECU (multiplex network body ECU) connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F15-19 (CLTB) - F15-21 (CLTE) |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
NG | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
|
4. |
INSPECT AUTOMATIC LIGHT CONTROL SENSOR |
(a) Reconnect the G1 automatic light control sensor connector. |
|
(b) Connect an oscilloscope to the automatic light control sensor connector.
(c) Check the waveform. OK:
HINT: The communication waveform changes according to the surrounding brightness. |
|
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
NG | ![]() |
REPLACE AUTOMATIC LIGHT CONTROL SENSOR |
Toyota CH-R Service Manual > Automatic Headlight Beam Level Control System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the automatic headlight
beam level control system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
...
Toyota CH-R Service Manual > Airbag System: Short in Rear Side Squib RH Circuit (B1850/62-B1853/62)
DESCRIPTION
The rear side squib RH circuit consists of the airbag sensor assembly and rear
seat airbag RH
The airbag sensor assembly uses this circuit to deploy the airbag when deployment
conditions are met.
These DTCs are stored when a malfunction is detected in the rear side squib RH
circ ...