Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Power Mirrors do not Return to Memorized Position

DESCRIPTION

If any of the M1, M2 or M3 seat memory switch is pressed, the outer mirror control ECU assembly (driver door) detects the switch operation and sends the seat memory switch signal to the main body ECU (multiplex network body ECU) via CAN communication. The main body ECU (multiplex network body ECU) sends the reproduction signal to each outer mirror control ECU assembly via CAN communication. When receiving the reproduction signal, each outer mirror control ECU assembly operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly, to adjust the mirror surface to the stored position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK SEAT MEMORY SWITCH FUNCTION

(a) When any seat memory switch (M1, M2 or M3) is pressed, check that the driver seat moves to the memorized position.

Click here

OK:

Driver seat moves to the memorized position.

NG

GO TO FRONT POWER SEAT CONTROL SYSTEM (Power Seat does not Return to Memorized Position)

OK

2.	CHECK ELECTRICAL REMOTE CONTROL MIRROR FUNCTION

(a) Check the electrical remote control mirror function.

Click here

OK:

Electrical remote control mirror function is normal.

NG

GO TO OTHER DIAGNOSTIC PROCEDURE (Power Mirror cannot be Adjusted with Power Mirror Switch)

OK

3.	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 / Mirror L / Data List.

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

Body Electrical > Mirror L > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Mirror Memory No.1	Mirror position memorized in memory switch M1	OFF or ON	OFF: Not memorized ON: Memorized	-
Mirror Memory No.2	Mirror position memorized in memory switch M2	OFF or ON	OFF: Not memorized ON: Memorized	-
Mirror Memory No.3	Mirror position memorized in memory switch M3	OFF or ON	OFF: Not memorized ON: Memorized	-

Body Electrical > Mirror L > Data List

Tester Display
Mirror Memory No.1
Mirror Memory No.2
Mirror Memory No.3

OK:

ON (Memorized) appears on the screen.

NG

GO TO OTHER DIAGNOSTIC PROCEDURE (Power Mirror Surface Position is not Memorized)

OK

4.	CHECK MEMORY AND REACTIVATION FUNCTION

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

*a Turn to Fully Left Position

(b) Using the multiplex network master switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the multiplex network master switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

Result	Proceed to
Memory and reactivation functions on both mirrors are not normal	A
Memory and reactivation functions on driver door mirror are not normal (ecxept TMMC Made)	B
Memory and reactivation functions on driver door mirror are not normal (for TMMC Made)	C
Memory and reactivation functions on front passenger door mirror are not normal (ecxept TMMC Made)	D
Memory and reactivation functions on front passenger door mirror are not normal (for TMMC Made)	E

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

C

GO TO STEP 7

D

GO TO STEP 10

E

GO TO STEP 12

B

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

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

Click here

NEXT

6.	CHECK MEMORY AND REACTIVATION FUNCTION

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

*a Turn to Fully Left Position

(b) Using the multiplex network master switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the multiplex network master switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

OK

END (OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) WAS DEFECTIVE)

NG

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)

7.	INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) (WIRE HARNESS)

(a) Remove the outer mirror actuator assembly (driver door).

Click here

(b) Disconnect the z12 outer mirror control ECU assembly (driver door) connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition z12-6 (VSSR) - D-2 Always Below 1 Ω z12-6 (VSSR) or D-2 - Body ground Always 10 kΩ or higher z12-5 (VDD) - D-3 Always Below 1 Ω z12-5 (VDD) or D-3 - Body ground Always 10 kΩ or higher z12-13 (HSSR) - D-1 Always Below 1 Ω z12-13 (HSSR) or D-1 - Body ground Always 10 kΩ or higher z12-14 (GND) - D-4 Always Below 1 Ω z12-14 (GND) or D-4 - Body ground Always 10 kΩ or higher

*a Front view of wire harness connector (to Outer Mirror Control ECU Assembly (Driver Door)) *b Front view of wire harness connector (to Outer Mirror Actuator Assembly (Driver Door))

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR)

OK

8.	REPLACE OUTER MIRROR ACTUATOR ASSEMBLY (DRIVER DOOR)

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

Click here

NEXT

9.	CHECK MEMORY AND REACTIVATION FUNCTION

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

*a Turn to Fully Left Position

(b) Using the multiplex network master switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the multiplex network master switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

OK

END (OUTER MIRROR ACTUATOR ASSEMBLY (DRIVER DOOR) WAS DEFECTIVE)

NG

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)

10.	REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR)

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

Click here

NEXT

11.	CHECK MEMORY AND REACTIVATION FUNCTION

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

*a Turn to Fully Left Position

(b) Using the multiplex network master switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the multiplex network master switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

OK

END (OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR) WAS DEFECTIVE)

NG

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)

12.	INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR) (WIRE HARNESS)

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

Click here

(b) Disconnect the z13 outer mirror control ECU assembly (front passenger door) connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition z13-6 (VSSR) - E-2 Always Below 1 Ω z13-6 (VSSR) or E-2 - Body ground Always 10 kΩ or higher z13-5 (VDD) - E-3 Always Below 1 Ω z13-5 (VDD) or E-3 - Body ground Always 10 kΩ or higher z13-13 (HSSR) - E-1 Always Below 1 Ω z13-13 (HSSR) or E-1 - Body ground Always 10 kΩ or higher z13-14 (GND) - E-4 Always Below 1 Ω z13-14 (GND) or E-4 - Body ground Always 10 kΩ or higher

*a Front view of wire harness connector (to Outer Mirror Control ECU Assembly (Front Passenger Door)) *b Front view of wire harness connector (to Outer Mirror Actuator Assembly (Front Passenger Door))

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR)

OK

13.	REPLACE OUTER MIRROR ACTUATOR ASSEMBLY (FRONT PASSENGER DOOR)

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

Click here

NEXT

14.	CHECK MEMORY AND REACTIVATION FUNCTION

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

*a Turn to Fully Left Position

(b) Using the multiplex network master switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the multiplex network master switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

OK

END (OUTER MIRROR ACTUATOR ASSEMBLY (FRONT PASSENGER DOOR) WAS DEFECTIVE)

NG

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)