Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Power Mirror Surface Position is not Memorized

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. On receiving the seat memory switch signal, the main body ECU (multiplex network body ECU) sends the memory request signal to each outer mirror control ECU assembly via CAN communication. When receiving this signal, each outer mirror control ECU assembly stores the mirror surface position based on information from the mirror position sensor, which is built into the outer rear view mirror assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Each outer rear view mirror assembly has a built-in mirror vertical position sensor and mirror horizontal position sensor.

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 / 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
Seat Memory Switch1	Seat memory switch M1 switch signal	OFF or ON	OFF: Seat memory switch M1 switch off ON: Seat memory switch M1 switch on	-
Seat Memory Switch2	Seat memory switch M2 switch signal	OFF or ON	OFF: Seat memory switch M2 switch off ON: Seat memory switch M2 switch on	-
Seat Memory Switch3	Seat memory switch M3 switch signal	OFF or ON	OFF: Seat memory switch M3 switch off ON: Seat memory switch M3 switch on	-
Seat Memory Set SW	Seat memory switch SET switch signal	OFF or ON	OFF: Seat memory switch SET switch off ON: Seat memory switch SET switch on	-

Body Electrical > Mirror L > Data List

Tester Display
Seat Memory Switch1
Seat Memory Switch2
Seat Memory Switch3
Seat Memory Set SW

OK:

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

NG

GO TO STEP 14

OK

2.	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:

The driver seat moves to the memorized position.

NG

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

OK

3.	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 6

D

GO TO STEP 9

E

GO TO STEP 11

B

4.	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

5.	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)

6.	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

7.	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

8.	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)

9.	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

10.	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)

11.	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

12.	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

13.	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)

14.	INSPECT SEAT MEMORY SWITCH

(a) Remove the seat memory switch (driver door).

Click here

(b) Inspect the seat memory switch (driver door).

Click here

NG

REPLACE SEAT MEMORY SWITCH

OK

15.	CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH - OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) - BODY GROUND)

(a) Disconnect the N4 outer mirror control ECU assembly (driver door) connector.

(b) Disconnect the N5 seat memory switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N4-1 (MM) - N5-2 (MMRY)	Always	Below 1 Ω
N4-1 (MM) or N5-2 (MMRY) - Body ground	Always	10 kΩ or higher
N4-2 (M1) - N5-8 (M1)	Always	Below 1 Ω
N4-2 (M1) or N5-8 (M1) - Body ground	Always	10 kΩ or higher
N4-3 (M2) - N5-6 (M2)	Always	Below 1 Ω
N4-3 (M2) or N5-6 (M2) - Body ground	Always	10 kΩ or higher
N4-4 (M3) - N5-3 (M3)	Always	Below 1 Ω
N4-4 (M3) or N5-3 (M3) - Body ground	Always	10 kΩ or higher
N5-1 (E) - Body ground	Always	Below 1 Ω

OK

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR