DESCRIPTION
This inspection is only for vehicles with automatic light control.
The meter CPU receives signals from this circuit to adjust the illumination of the meter, instrument panel and accessory meter assembly. The meter CPU sets the illumination level based on the user operation of the light control rheostat.
HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Setting the meter illumination to minimum brightness turns off the meter illumination when the light control switch is changed to the tail or head position, or changed to the AUTO position at night.
PROCEDURE
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if a CAN communication DTC is output (See page ).
Result |
Proceed to |
---|---|
CAN communication DTC is not output |
A |
CAN communication DTC is output |
B |
B |
GO TO CAN COMMUNICATION SYSTEM |
|
2. |
CHECK DTC (LIGHT SENSOR CIRCUIT) |
(a) Check if DTC B1244 is output (See page ).
Result |
Proceed to |
---|---|
B1244 is not output |
A |
B1244 is output |
B |
B |
GO TO LIGHTING SYSTEM |
|
3. |
CHECK OPERATION (HEATER CONTROL PANEL) |
(a) Turn the ignition switch to ON.
(b) Turn the light control switch to the tail, head or AUTO position.
(c) Cover the automatic light control sensor.
(d) Check the heater control panel illumination.
Result
Result |
Proceed to |
---|---|
Heater control panel illumination does not operate normally |
A |
Heater control panel illumination operates normally |
B |
HINT:
Both the heater control panel and combination meter assembly illumination dim according to the dimmer signal. Therefore, when only the meter illumination is always dark, there may be a malfunction in the combination meter assembly.
B |
REPLACE COMBINATION METER ASSEMBLY |
|
4. |
CHECK OPERATION (AUTOMATIC LIGHT CONTROL SYSTEM) |
(a) Turn the ignition switch to ON.
(b) Turn the light control switch to the AUTO position.
(c) Cover the automatic light control sensor.
(d) Check the taillights and low beam headlights.
OK:
The taillights and low beam headlights come on.
(e) Uncover the automatic light control sensor.
(f) Check the low beam headlights and taillights.
OK:
The taillights and low beam headlights go off.
Result
Result |
Proceed to |
---|---|
Automatic light control system operates normally |
A |
Automatic light control system does not operate normally |
B |
B |
GO TO LIGHTING SETTING |
|
5. |
REPLACE MAIN BODY ECU |
(a) Replace the main body ECU with a new or normally functioning one (See page ).
OK:
The operation of the combination meter assembly returns to normal.
HINT:
The meter CPU controls the meter illumination based on an auto dimmer signal from the main body ECU. When the meter illumination is always dark (very dim), it may be due to the main body ECU sending an auto dimmer signal to the meter CPU because of a malfunction in the main body ECU.
OK |
END |
NG |
REPLACE COMBINATION METER ASSEMBLY |
Front Clearance Sonar Sensor LH Circuit
DESCRIPTION
The ultrasonic sensor sends and receives ultrasonic waves. Based on the received
wave, the sensor calculates the approximate distance between the vehicle and the
obstacle, and sends the distance value as a signal to the clearance warning ECU
...
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
When removing the window frame moulding, black out tape and outside
stripe, heat the vehicle body, windo ...