Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Power Retractable Mirrors do not Operate with Power Retract Mirror Switch

DESCRIPTION

The multiplex network master switch assembly sends the retractable outer mirror switch signal to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the mirror retract/return signal to each outer mirror control ECU assembly via CAN communication. Based on the signal, each outer mirror control ECU assembly retracts or returns its corresponding outer rear view mirror assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Master Switch / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Master Switch > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Outer Mirror Fold SW	Retractable outer mirror switch signal	OFF or ON	OFF: Retractable outer mirror switch off ON: Retractable outer mirror switch on	-

Body Electrical > Master Switch > Data List

Tester Display
Outer Mirror Fold SW

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

NG

GO TO STEP 11

OK

2.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Enter the following menus: Body Electrical / Mirror L or Mirror R / Active Test.

(b) Perform the Active Test according to the display on the Techstream.

Body Electrical > Mirror L > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Mirror Fold/Return	Mirror retract operation	OFF, Return or Fold	operate with the engine switch on (IG) and the vehicle stopped. This test activates the Fold / Return. This operation can be confirmed by watching the mirror move in the desired direction.

Body Electrical > Mirror L > Active Test

Tester Display
Mirror Fold/Return

Body Electrical > Mirror R > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Mirror Fold/Return	Mirror retract operation	OFF, Return or Fold	operate with the engine switch on (IG) and the vehicle stopped. This test activates the Fold / Return. This operation can be confirmed by watching the mirror move in the desired direction.

Body Electrical > Mirror R > Active Test

Tester Display
Mirror Fold/Return

Result	Proceed to
Outer rear view mirror assemblies operate normally	A
Outer rear view mirror assembly (driver door) does not operate normally (except TMMC Made)	B
Outer rear view mirror assembly (front passenger door) does not operate normally (except TMMC Made)	C
Outer rear view mirror assembly (driver door) does not operate normally (for TMMC Made)	D
Outer rear view mirror assembly (front passenger door) does not operate normally (for TMMC Made)	E

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

C

GO TO STEP 4

D

GO TO STEP 5

E

GO TO STEP 8

B

3.	INSPECT OUTER MIRROR RETRACTOR (DRIVER DOOR)

(a) Remove the outer mirror retractor (driver door).

Click here

(b) Inspect the outer mirror retractor (driver door).

Click here

OK

GO TO STEP 6

NG

REPLACE OUTER MIRROR RETRACTOR (DRIVER DOOR)

4.	INSPECT OUTER MIRROR RETRACTOR (FRONT PASSENGER DOOR)

(a) Remove the outer mirror retractor (front passenger door).

Click here

(b) Inspect the outer mirror retractor (front passenger door).

Click here

OK

GO TO STEP 9

NG

REPLACE OUTER MIRROR RETRACTOR (FRONT PASSENGER DOOR)

5.	INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR)

(a) Remove the outer rear view mirror assembly (driver door).

Click here

(b) Inspect the outer rear view mirror assembly (driver door).

Click here

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR)

OK

6.	REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)

(a) Temporarily replace the outer mirror control ECU assembly (driver door) with a new or known good one.

Click here

NEXT

7.	CHECK POWER RETRACT MIRROR FUNCTION

(a) Check the power retract mirror function operates normally.

Click here

OK:

Power retract mirror function operates normally.

OK

END (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) WAS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

8.	INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR)

(a) Remove the outer rear view mirror assembly (front passenger door).

Click here

(b) Inspect the outer rear view mirror assembly (front passenger door).

Click here

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR)

OK

9.	REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)

(a) Temporarily replace the outer mirror control ECU assembly (front passenger door) with a new or known good one.

Click here

NEXT

10.	CHECK POWER RETRACT MIRROR FUNCTION

(a) Check the power retract mirror function operates normally.

Click here

OK:

Power retract mirror function operates normally.

OK

END (OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR) WAS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

11.	REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Temporarily replace the multiplex network master switch assembly with a new or known good one.

Click here

NEXT

12.	CHECK POWER RETRACT MIRROR FUNCTION

(a) Check the power retract mirror function operates normally.

Click here

OK:

Power retract mirror function operates normally.

OK

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)