Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Switch Lights of Remote Touch Always Illuminate or cannot be Controlled Using Rheostat

1.

CHECK ILLUMINATION CONTROLLED BY RHEOSTAT SWITCH

Any of the illumination controlled by the rheostat switch does not illuminate properly.

A

All of the illumination controlled by the rheostat switch illuminates properly.

B

GO TO STEP 3

2.

REPAIR OR REPLACE ILLUMINATION CONTROLLED BY RHEOSTAT SWITCH

GO TO STEP 3

3.

CHECK SYMPTOMS

(a) Perform the following procedure, operate the rheostat switch again, and check if illumination brightness adjustment is possible (including adjustment of other devices such as the radio receiver assembly).

(1) Check if the remote touch (remote operation controller assembly) is in self check mode. If it is, cancel self check mode.

Click here

HINT:

When the remote touch (remote operation controller assembly) is in self check mode, the switch illumination on the remote touch (remote operation controller assembly) may remain on.

(2) If the vehicle is in a bright area, move it to a dark area.

HINT:

When the vehicle is in a bright area, the switch illumination may not turn on due to the auto dimmer function.

(3) If the light control switch is in the AUTO position, turn the switch to the tail or head position.

HINT:

If the light control switch is in the AUTO position, the switch illumination will not turn on unless the surrounding area is dark.

Switch illumination cannot be adjusted (illumination for other devices can be adjusted).

A

Switch illumination cannot be adjusted (illumination for other devices also cannot be adjusted).

B

Switch illumination can be adjusted.

C

GO TO METER / GAUGE SYSTEM

END

4.

REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY) SELF CHECK (SWITCH ILLUMINATION CHECK)

(b) Operate the remote touch screen diagonally from the upper left to the lower right and check that the brightness of the switch illumination changes.

NOTICE:

Since the remote touch screen may recognize a pinch in/out or flick operation if operated with 2 fingers, always use 1 finger to operate the remote touch screen in self-diagnostic mode.

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

5.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT)

J154-2 (ILL+) - Body ground

Light control switch in tail or head position

11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY) - COMBINATION METER ASSEMBLY)

J154-5 (ILL-) - J10-39 (ILL-)

Always

Below 1 Ω

J154-5 (ILL-) or J10-39 (ILL-) - Body ground

Always

10 kΩ or higher

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR