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 |
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE COOLER BRACKET
(a) Detach the clamp.
(b) Remove the screw and cooler bracket.
2. REMOVE MAGNET CLUTCH ASSEMBLY
(a) Clamp the cooler compressor in a vise.
(b) Using SST, hold the magnet clutch hub.
SST: 07112-76060
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System Description
SYSTEM DESCRIPTION
1. WIRELESS DOOR LOCK CONTROL SYSTEM DESCRIPTION
(a) This system locks/unlocks the doors remotely. The wireless door lock control
system has the following features:
The certification ECU performs the code identification process a ...