Toyota Sienna Service Manual: Operating Light Control Rheostat does not Change Light Brightness
DESCRIPTION
The meter CPU receives signals for adjusting illumination on the meter from this circuit. The meter CPU detects the illumination level selected by the user according to the position of the rheostat knob.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 READ VALUE OF INTELLIGENT TESTER (LIGHT RHEOSTAT)
- Connect the intelligent tester to the DLC3.
- Turn the switch to the ON position.
- Turn the tester ON.
- Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
- Check the values by referring to the table below.
METER:
OK: Light brightness displayed on the tester is almost the same as the actual light brightness.
REPLACE COMBINATION METER ASSEMBLY
2 CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT CIRCUIT)
- Disconnect the C10 connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
- Measure the voltage according to the value(s) in the table below.
Standard voltage
REPLACE COMBINATION METER ASSEMBLY
Driver Side Seat Belt Warning Light does not Operate
DESCRIPTION
When turning the ignition switch to the ON position, the combination meter
assembly communicates with
the supplemental restraint system by the multiplex communication system. Unless
...
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 ...
Other materials:
Camshaft Position Sensor "B" Circuit
DESCRIPTION
The exhaust camshaft's Variable Valve Timing (VVT) sensor consists of a
magnet and MRE (Magneto
Resistance Element).
The exhaust camshaft has a sensor plate with 3 teeth on its outer circumference.
When the exhaust camshaft rotates, changes occur in the air gaps between the ...
How to proceed with
troubleshooting
NOTICE:
DTCs for the CAN communication system are as follows:
U0073, U0100, U0122, U0123, U0124, U0126 and U1101.
HINT:
If U0235 or U1102 is output alone, the CAN communication is
normal
1 CHECK AND CLEAR DTCS
HINT:
CAN communication DTCs are output when there is an
open or short in any ...
Data list / active test
1. DATA LIST
HINT:
By the DATA LIST displayed by the intelligent tester, you
can read the value of the switch, sensor, actuator and so
on without removing any part. Reading the DATA LIST
as the first step in troubleshooting is one of the methods
to shorten the labor time.
Connect the ...
