Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Main Switch Circuit

DESCRIPTION

The headup display switch assembly (integration control and panel assembly) and headup display (meter mirror sub-assembly) are connected via direct line. The headup display (meter mirror sub-assembly) can be turned off and on by operating the headup display switch assembly (integration control and panel assembly).

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (MAIN SWITCH)

(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 / Head Up Display / Data List.

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

Body Electrical > Head Up Display > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Main Switch

Headup display switch assembly

OFF or ON

OFF: Switch released

ON: Switch pushed

-

Body Electrical > Head Up Display > Data List

Tester Display

Main Switch

OK:

Headup display switch assembly condition displayed on the Techstream changes with the actual switch operation.

OK

REPLACE HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY)

NG

2.

INSPECT HEADUP DISPLAY SWITCH ASSEMBLY (INTEGRATION CONTROL AND PANEL ASSEMBLY)

(a) Remove the integration control and panel assembly.

Click here

(b) Inspect the integration control and panel assembly.

Click here

NG

REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY) - INTEGRATION CONTROL AND PANEL ASSEMBLY)

(a) Disconnect the K1 headup display (meter mirror sub-assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K1-16 (SW1) - J83-5 (ILU)

Always

Below 1 Ω

K1-15 (E) - J83-15 (CH)

Always

Below 1 Ω

K1-16 (SW1) or J83-5 (ILU) - Body ground

Always

10 kΩ or higher

K1-15 (E) or J83-15 (CH) - Body ground

Always

10 kΩ or higher

OK

REPLACE HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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    ...

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