Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Switch Lights of Remote Touch do not Illuminate

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

CHECK SYMPTOMS

(a) Perform the following procedure and check the switch illumination again.

(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 automatic dimmer function.

(2) Set the rheostat to maximum brightness.

HINT:

If the brightness of the rheostat is set to low, switch illumination may not be recognized even when the switch illumination turns on.

(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.

OK:

Switch illumination turns on.

*a

Switch Illumination

OK

END

NG

2.

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

(a) Enter 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 changes according to remote touch screen operation.

*a

Switch Illumination

*b

Remote Touch Screen

NG

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT)

(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

4.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

(a) Replace the remote touch (remote operation controller assembly) with a new or known good one.

Click here

(b) Check if the switch illumination turns on.

OK:

The switch illumination turns on when the light control switch is in the tail or head position.

OK

END

NG

GO TO METER / GAUGE SYSTEM

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