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
| 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 | - |
| Tester Display |
|---|
| ECO Switch |
OK:
Combination switch assembly (ECO mode switch) condition displayed on the Techstream changes with the actual switch operation.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | INSPECT COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH) |
(a) Remove the combination switch assembly (ECO mode switch).
Click here .gif)
| (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG | | REPLACE COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH) |
|
| 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 |
|
| 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 |
Back-up Power Source Circuit
DESCRIPTION The back-up power source circuit for the air conditioning amplifier assembly is shown below. Power is supplied even when the engine switch is off. This power is used for diagnostic trouble ...
IG Power Source Circuit
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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