Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Front Passenger Side Power Mirror cannot be Adjusted with Power Mirror Switch

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Exterior / Mirror (ext) / Power Mirror Control System (w/ Memory) / Front Passenger Side Power Mirror cannot be Adjusted with Power Mirror Switch

DESCRIPTION

The multiplex network master switch assembly sends the mirror adjust switch signals to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the received mirror adjust switch signals to the outer mirror control ECU assembly (front passenger door) via CAN communication. On receiving the signal, the outer mirror control ECU assembly (front passenger door) operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly (front passenger door), to adjust the mirror surface position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The power mirror control system (w/ Memory) uses the CAN communication system and LIN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the power window control system after confirming that the communication systems are functioning properly.

    Click here

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

    Click here

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

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

-

Mirror Position SW (L)

Mirror adjust switch signal (Left)

OFF or ON

OFF: Mirror adjust switch not pressed left

ON: Mirror adjust switch pressed left

Check with the mirror select switch L or R switch on

Mirror Position SW (R)

Mirror adjust switch signal (Right)

OFF or ON

OFF: Mirror adjust switch not pressed right

ON: Mirror adjust switch pressed right

Check with the mirror select switch L or R switch on

Mirror Position SW (Up)

Mirror adjust switch signal (Up)

OFF or ON

OFF: Mirror adjust switch not pressed up

ON: Mirror adjust switch pressed up

Check with the mirror select switch L or R switch on

Mirror Position SW (Dwn)

Mirror adjust switch signal (Down)

OFF or ON

OFF: Mirror adjust switch not pressed down

ON: Mirror adjust switch pressed down

Check with the mirror select switch L or R switch on

Body Electrical > Master Switch > Data List

Tester Display

Mirror Selection SW (R)

Mirror Position SW (L)

Mirror Position SW (R)

Mirror Position SW (Up)

Mirror Position SW (Dwn)

OK:

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

NG

GO TO STEP 4

OK

2.

INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR) (MIRROR SURFACE)

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

Click here

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

Click here

Result

Proceed to

OK

A

NG (ecxept TMMC Made)

B

NG (for TMMC Made)

C

A

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)

B

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR)

C

3.

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

z13-9 (MH) - C-3

Always

Below 1 Ω

z13-9 (MH) or C-3 - Cody ground

Always

10 kΩ or higher

z13-10 (M+) - C-4

Always

Below 1 Ω

z13-10 (M+) or C-4 - Cody ground

Always

10 kΩ or higher

z13-1 (MV) - C-1

Always

Below 1 Ω

z13-1 (MV) or C-1 - Cody 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))

OK

REPLACE OUTER MIRROR ACTUATOR ASSEMBLY (FRONT PASSENGER DOOR)

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR)

4.

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

5.

CHECK POWER MIRROR CONTROL OPERATION

(a) Check the electrical remote control mirror function.

Click here

OK:

Electrical remote control mirror function operates normally.

OK

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Driver Side Power Mirror cannot be Adjusted with Power Mirror Switch
    DESCRIPTION The multiplex network master switch assembly sends the mirror adjust switch signals to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex ne ...

    Power Mirror cannot be Adjusted with Power Mirror Switch
    DESCRIPTION The multiplex network master switch assembly sends the mirror adjust switch signals to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex ne ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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