Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: ECO Switch Circuit

Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / ECO Switch Circuit

DESCRIPTION

When the combination switch assembly (ECO mode switch) is turned on, the air conditioning amplifier assembly receives a combination switch assembly (ECO mode switch) ON signal and controls the air conditioning to enhance fuel efficiency.

WIRING DIAGRAM

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 / Air Conditioner / Data List.

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

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ECO Switch

Combination switch assembly (ECO mode switch)

OFF or ON

ON: Combination switch assembly (ECO mode switch) being turned and held at ECO position

OFF: Combination switch assembly (ECO mode switch) not turned

-
Body Electrical > Air Conditioner > Data List

Tester Display

ECO Switch

OK:

Combination switch assembly (ECO mode switch) condition displayed on the Techstream changes with the actual switch operation.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH)

(a) Remove the combination switch assembly (ECO mode switch).

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (GND) - 9 (ECU)

Combination switch assembly (ECO mode switch) not turned

10 kΩ or higher

1 (GND) - 9 (ECU)

Combination switch assembly (ECO mode switch) being turned and held at ECO position

Below 50 Ω

*a

Component without harness connected

(Combination Switch Assembly (ECO Mode Switch))
NG

REPLACE COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH)

OK

3.

CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the J42 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J42-20 (ECOS) - J35-9 (ECU)

Always

Below 1 Ω

J42-20 (ECOS) or J35-9 (ECU) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH) - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J35-1 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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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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