Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Reverse Shift-linked Function of Power Mirrors does not Operate

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Mirror (ext) / Power Mirror Control System (w/ Memory) / Reverse Shift-linked Function of Power Mirrors does not Operate

DESCRIPTION

The ECM sends the reverse signal to the main body ECU (multiplex network body ECU) via CAN communication. When receiving the reverse signal, the main body ECU (multiplex network body ECU) sends the reverse request signal to each outer mirror control ECU assembly. Based on the signal, each outer mirror control ECU assembly then performs control.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The power mirror control system (w/ Memory) uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

HINT:

The reverse shift-linked function will not activate when both the mirror select switch L and R switch are off.

PROCEDURE

1.

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 are normal

A

Memory function is not normal

B

Reactivation function is not normal

C
B

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

C

GO TO OTHER DIAGNOSTIC PROCEDURE (Power Mirrors do not Return to Memorized Position)

A

2.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / DTC.

(e) Check if SFI system DTCs are output.

Powertrain > Engine > Trouble Codes

OK:

SFI system DTCs are not output.

NG

GO TO SFI SYSTEM

OK

3.

CHECK COMBINATION METER ASSEMBLY

(a) Check if the shift position indicator light in the combination meter assembly operates normally.

OK:

Shift position indicator light indicates the actual shift position correctly.

NG

GO TO METER / GAUGE SYSTEM

OK

4.

CHECK REVERSE SHIFT-LINKED FUNCTION

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

*a

Turns Downward

(b) Turn the mirror select switch R or L switch on.

(c) Check that the mirror surface turns downward when the shift lever is moved to R.

Result

Proceed to

Reverse shift-linked functions on both mirrors are not normal

A

Reverse shift-linked function on driver door is not normal

B

Reverse shift-linked function on front passenger door is not normal

C
B

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)

C

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)

A

5.

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

Mirror Selection SW (L)

Mirror select switch signal for LH mirror

OFF or ON

OFF: Mirror select switch off

ON: Mirror select switch L switch on

-

Mirror Selection SW (R)

Mirror select switch signal for RH mirror

OFF or ON

OFF: Mirror select switch off

ON: Mirror select switch R switch on

-
Body Electrical > Master Switch > Data List

Tester Display

Mirror Selection SW (L)

Mirror Selection SW (R)

OK:

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

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

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