B1244

LIGHTING: LIGHTING SYSTEM: B1244: Light Sensor Circuit Malfunction

DTC B1244 - Light Sensor Circuit Malfunction

DESCRIPTION

This DTC is output when failure in the light sensor circuit is detected.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK LIGHTS
(a) Check that the headlight and the taillight come on.

NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH)
(a) Using the Techstream, read the Data List.

Body





OK:
Tester display changes according to the switch operation.

NG -- CHECK HARNESS AND CONNECTOR (BETWEEN HEADLIGHT DIMMER SWITCH ASSEMBLY AND BODY ECU)
OK -- Continue to next step.

3. INSPECT AUTOMATIC LIGHT CONTROL SENSOR




(a) Measure voltage between terminals as shown in the chart below.
(b) Check the continuity between terminal 3 (CLTE) and body ground as shown in the chart below.
(c) Using an oscilloscope, check that signal waveform appears between terminals.
Standard voltage:





NG -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (BETWEEN BODY ECU AND AUTOMATIC LIGHT CONTROL SENSOR)
(a) Check that signal waveform appears between terminals B6-4 (CLTS) and B6-21 (CLTE) of the multiplex network body ECU.
Standard:
Bar appears
(b) Measure voltage between terminals B6-6 (CLTB) and B6-21 (CLTE) of the multiplex network body ECU.
Standard voltage:
10 to 14 V
(c) Check the continuity between terminal B6-21 (CLTE) of the multiplex network body ECU and body ground.
Standard:
There is continuity

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MULTIPLEX NETWORK BODY ECU
5. CHECK HARNESS AND CONNECTOR (BETWEEN HEADLIGHT DIMMER SWITCH ASSEMBLY AND BODY ECU)
(a) Check for open and short circuit in harness and connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY