Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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

(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.

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

(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

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

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

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Standard Resistance:

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR