Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Touch Pad Memory Module Malfunction (B155B)

DESCRIPTION

This DTC is stored if the remote touch (remote operation controller assembly) detects a malfunction in itself, such as internal hardware failure or remote touch screen memory module malfunction.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B155B	Touch Pad Memory Module Malfunction	Internal memory module malfunction	Remote touch (remote operation controller assembly)

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.	CHECK INFORMATION CODE

(a) Check that the part number of the remote touch (remote operation controller assembly) is correct.

Result	Proceed to
The part number of the remote touch (remote operation controller assembly) is correct	A
The part number of the remote touch (remote operation controller assembly) is incorrect	B

B

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

A

3.	REMOTE TOUCH SELF CHECK (CHECK REMOTE TOUCH SCREEN OPERATION POSITION RECOGNITION CONDITION)

(a) Enter self-diagnostic mode.

Click here

(b) Operate the remote touch screen laterally and check that the remote touch screen generates vibration feedback.

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.

HINT:

When operating at an excessively low temperature, vibration feedback may be difficult to feel.

Result	Proceed to
Vibration feedback is generated according to remote touch screen operation	A
The switch illumination changes but vibration feedback is not generated according to remote touch screen operation	B

B

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)

A

4.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) Turn the engine switch off.

(c) Turn the engine switch on (ACC) and wait for 5 seconds.

(d) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY)