Lexus NX manuals

Lexus NX: Pattern Select Switch Eco Mode Circuit

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Pattern Select Switch Eco Mode Circuit

DESCRIPTION

When selecting ECO mode, the mode switch (integration control & panel assembly) operation signal is sent to the air conditioning amplifier assembly. Following this, ECO mode control is activated for the heater and air conditioning system.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

Click here

Result

Proceed to

All of the ECUs and sensors that are currently connected to the CAN communication system are displayed.

A

None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed.

B
B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK DTC OUTPUT (HEALTH CHECK)

Click here

DTCs are output.

GO TO DTC CHART
No DTCs are output.

3.

READ VALUE USING TECHSTREAM (ECO MODE)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / ECO Mode.

Powertrain > Hybrid Control > Data List

Tester Display

ECO Mode

(d) Read the value displayed on the Techstream.

Powertrain > Hybrid Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

ECO Mode

ECO mode transition availability

ON or OFF

In ECO mode: ON

Result

Proceed to

The Techstream display changes according to the integration control & panel assembly operation.

A

The Techstream display does not change according to the integration control & panel assembly operation.

B
A

CHECK FOR INTERMITTENT PROBLEMS

B

4.

READ VALUE USING TECHSTREAM (ECO SWITCH)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Body Electrical / Air Conditioning / Data List / ECO Switch.

Body Electrical > Air Conditioner > Data List

Tester Display

ECO Switch

(d) Read the value displayed on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

ECO Switch

Integration control & panel assembly condition

ON or OFF

Integration control & panel assembly being turned and held at ECO position: ON

Integration control & panel assembly not turned: OFF

Result

Proceed to

The Techstream display changes according to the integration control & panel assembly operation.

A

The Techstream display does not change according to the integration control & panel assembly operation.

B
A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

B

5.

INSPECT INTEGRATION CONTROL & PANEL ASSEMBLY

(a) Remove the integration control & panel assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I66-9 (ECU) - I66-1 (GND)

Integration control & panel assembly being turned and held at ECO position

Below 10 Ω

Integration control & panel assembly not turned

10 kΩ or higher

*a

Component without harness connected

(Integration Control & Panel Assembly)

(c) Install the integration control & panel assembly.

NG

REPLACE INTEGRATION CONTROL & PANEL ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL & PANEL ASSEMBLY - BODY GROUND)

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - INTEGRATION CONTROL & PANEL ASSEMBLY)

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

Click here

(b) Disconnect the I66 integration control & panel 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

*a

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

*b

Front view of wire harness connector

(to Integration Control & Panel Assembly)

(d) Reconnect the I66 integration control & panel assembly connector.

(e) Reconnect the I50 air conditioning amplifier assembly connector.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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