Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Switch Lights of Remote Touch Always Illuminate or cannot be Controlled Using Rheostat

Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual / Audio & Visual & Telematics / Audio / Video / Audio And Visual System (for 12.3 Inch Display) / Switch Lights of Remote Touch Always Illuminate or cannot be Controlled Using Rheostat

DESCRIPTION

Power is supplied to the remote touch (remote operation controller assembly) switch illumination when the light control switch is in the tail or head position.

HINT:

  • When the remote touch (remote operation controller assembly) is in self-diagnostic mode, its switch illumination may remain on.
  • If any illumination controlled by the rheostat switch has a malfunction such as a short to ground, the remote touch (remote operation controller assembly) switch illumination is affected and cannot be controlled by the rheostat switch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuse for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK ILLUMINATION CONTROLLED BY RHEOSTAT SWITCH

(a) Perform the following procedure and check that the illumination controlled by the rheostat switch illuminates properly.

(1) 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.

(2) If the light control switch is in the AUTO position, turn it 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.

Result

Proceed to

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

HINT:

The shift lever illumination and panel switch illumination are controlled by the rheostat switch. If either of these has a malfunction, such as an open circuit, the remote touch (remote operation controller assembly) switch illumination is affected and cannot be controlled by the rheostat switch.

B

GO TO STEP 3

A

2.

REPAIR OR REPLACE ILLUMINATION CONTROLLED BY RHEOSTAT SWITCH

(a) Repair or replace the part with the malfunctioning illumination that is controlled by the rheostat switch.

NEXT

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-diagnostic mode. If it is, cancel self-diagnostic mode.

Click here

HINT:

When the remote touch (remote operation controller assembly) is in self-diagnostic mode, the remote touch (remote operation controller assembly) switch illumination 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 it 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.

Result

Proceed to

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

*a

Switch Illumination
B

GO TO METER / GAUGE SYSTEM

C

END
A

4.

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

(a) Activate self-diagnostic mode.

Click here

(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.

OK:

Brightness of the switch illumination changes according to remote touch screen operation.

*a

Switch Illumination

*b

Remote Touch Screen
NG

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

OK

5.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the J154 remote touch (remote operation controller assembly) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

J154-2 (ILL+) - Body ground

Light control switch in tail or head position

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

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

(a) Disconnect the J154 remote touch (remote operation controller assembly) connector.

(b) Disconnect the J10 combination meter assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

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

Always

Below 1 Ω

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

Always

10 kΩ or higher
OK

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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