Lexus NX: Power Mirror cannot be Adjusted with Power Mirror Switch

Lexus NX Service Manual / Vehicle Exterior / Mirror (ext) / Power Mirror Control System (w/ Memory) / Power Mirror cannot be Adjusted with Power Mirror Switch

DESCRIPTION

When the outer mirror switch assembly mirror select switch is operated, right/left selection signals are sent to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) sends the received right/left selection signals to the outer mirror control ECU assemblies via CAN communication.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this problem.

    Click here

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (OUTER MIRROR SWITCH ASSEMBLY)

(a) Using the Techstream, read the Data List.

Click here

Body Electrical > Main Body > 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 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 Position SW (R)

Mirror surface adjust switch signal (Right)

OFF or ON

OFF: Mirror surface adjust switch not pressed right

ON: Mirror surface adjust switch pressed right

Check with the mirror select switch L or R switch on

Mirror Position SW (L)

Mirror surface adjust switch signal (Left)

OFF or ON

OFF: Mirror surface adjust switch not pressed left

ON: Mirror surface adjust switch pressed left

Check with the mirror select switch L or R switch on

Mirror Position SW (Up)

Mirror surface adjust switch signal (Up)

OFF or ON

OFF: Mirror surface adjust switch not pressed up

ON: Mirror surface adjust switch pressed up

Check with the mirror select switch L or R switch on

Mirror Position SW (Dwn)

Mirror surface adjust switch signal (Down)

OFF or ON

OFF: Mirror surface adjust switch not pressed down

ON: Mirror surface adjust switch pressed down

Check with the mirror select switch L or R switch on

Body Electrical > Main Body > Data List

Tester Display

Mirror Selection SW (R)

Mirror Selection SW (L)

Mirror Position SW (R)

Mirror Position SW (L)

Mirror Position SW (Up)

Mirror Position SW (Dwn)

OK:

The display is as specified in the normal condition column.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

2.

INSPECT OUTER MIRROR SWITCH ASSEMBLY

(a) Remove the outer mirror switch assembly.

Click here

(b) Inspect the outer mirror switch assembly.

Click here

NG

REPLACE OUTER MIRROR SWITCH ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (OUTER MIRROR SWITCH ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])

(a) Disconnect the I49 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the M13 outer mirror switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M13-13 (M+) - I49-4 (MIRB)

Always

Below 1 Ω

M13-14 (MSW) - I49-5 (MIRS)

Always

Below 1 Ω

M13-12 (E) - I49-6 (MIRE)

Always

Below 1 Ω

M13-13 (M+) or I49-4 (MIRB) - Body ground

Always

10 kΩ or higher

M13-14 (MSW) or I49-5 (MIRS) - Body ground

Always

10 kΩ or higher

M13-12 (E) or I49-6 (MIRE) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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