Lexus NX: ECO Switch Circuit

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When the auxiliary battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

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PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the values by referring to the table below.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ECO Switch

Integration control and panel assembly (ECO mode switch)

ON or OFF

ON: Integration control and panel assembly (ECO mode switch) being turned and held at ECO position

OFF: Integration control and panel assembly (ECO mode switch) not turned

-

Body Electrical > Air Conditioner > Data List

Tester Display

ECO Switch

OK:

Integration control and panel 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 INTEGRATION CONTROL AND PANEL ASSEMBLY (ECO MODE SWITCH)

(a) Remove the integration control and panel assembly (ECO mode switch).

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(b) Inspect the integration control and panel assembly (ECO mode switch).

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NG

REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY (ECO MODE SWITCH)

OK

3.

CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY [ECO MODE SWITCH] - AIR CONDITIONING AMPLIFIER ASSEMBLY AND BODY GROUND)

(a) Disconnect the I66 integration control and panel assembly (ECO mode switch) connector.

(b) Disconnect the I50 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I50-4 (ECOS) - I66-9 (ECU)

Always

Below 1 Ω

I50-4 (ECOS) or I66-9 (ECU) - Body ground

Always

10 kΩ or higher

I66-1 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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