- Malfunction of the light sensor.
- Open or short of the light sensor circuit.
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Vehicle Exterior | Section: Lighting (ext) | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002R6J007X |
| Title: LIGHTING (EXT): LIGHTING SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1244 |
Light Sensor Circuit Malfunction |
DESCRIPTION
This DTC is stored 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
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Clear the DTCs
.
(b) Check for DTCs
.
OK:
DTC B1244 output does not occur.
|
|
2. |
READ VALUE USING TECHSTREAM (AUTOMATIC LIGHT CONTROL SENSOR) |
(a) Using the Techstream, read the Data List.
Main Body
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Illumination Rate Info |
Illuminance detected by automatic light control sensor/0 to 235600 lx |
Illuminance value displayed |
- |
OK:
Output illuminance is as shown in table above.
|
|
3. |
CHECK MAIN BODY ECU (CLTB - CLTE VOLTAGE) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
E2-20 (CLTB) - E2-18 (CLTE) |
Engine switch on (IG) |
11 to 14 V |
|
|
4. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) |
(a) Disconnect the E2 ECU connector.
(b) Disconnect the F9 sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E2-20 (CLTB) - F9-6 (CLTB) |
Always |
Below 1 Ω |
|
E2-19 (CLTS) - F9-5 (CLTS) |
||
|
E2-18 (CLTE) - F9-3 (CLTE) |
||
|
E2-20 (CLTB) - Body ground |
Always |
10 kΩ or higher |
|
E2-19 (CLTS) - Body ground |
||
|
E2-18 (CLTE) - Body ground |
|
|
|