Toyota Sienna Service Manual: Meter Illumination does not Dim at Night
DESCRIPTION
- Confirm that the vehicle is equipped with the optitron meter, then check this circuit.
- The combination meter assembly receives a auto dimmer signal from the body ECU by the multiplex communication line.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK MULTIPLEX COMMUNICATION SYSTEM
- Check if MULTIPLEX communication DTC is output
Result
2 CHECK DTC
- Check if the DTC B1244 is output
Result
3 PERFORM ACTIVE TEST BY INTELLIGENT TESTER
- Operate the intelligent tester according to the steps on the display and select "DATA LIST".
MAIN BODY
OK: The meter illumination is dimmed when the DIMMER SIG is ON.
CHECK LIGHTING SETTING
4 REPLACE COMBINATION METER ASSEMBLY
OK: The operation of the combination meter assembly returns to normal.
END
Meter Illumination is Always Dark
DESCRIPTION
Confirm that the vehicle is equipped with the optitron meter, then
check this circuit.
The combination meter assembly receives a auto dimmer signal from the
body ECU by t ...
Combination meter
COMPONENTS
...
Other materials:
Disassembly
HINT:
On the RH side, use the same procedures as on the LH side.
1. REMOVE FRONT DOOR LOWER FRAME BRACKET GARNISH LH
Using a screwdriver, disengage the clip and claw,
and remove the garnish.
HINT:
Tape the screwdriver tip before use.
2. REMOVE FRONT DOOR INSIDE HANDLE BEZEL PLUG LH
...
Evap monitor (key-off type)
(a) Preconditions
The monitor will not run unless:
The fuel tank is less than 90% full.
The altitude is less than 8000 ft (2450 m).
The vehicle is stationary.
The engine coolant temperature is between
4.4°C and 35°C (40°F and 95°F).
The intake air temperature is between 4.4°C and ...
For vehicles equipped with catalytic converter
CAUTION: If a large amount of unburned gasoline or gasoline vapors flow
into the converter, it may cause overheating and create a fire hazard. To
prevent this, observe the following precautions:
(a) Use only unleaded gasoline.
(b) Avoid idling the engine for more than 20 minutes.
(c) ...
