Pattern Select Switch Eco Mode Circuit [10/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus LS 500h. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)
See step 2

Result

Proceed to

A

B

Result:

B

GO TO CAN COMMUNICATION SYSTEM

w/ Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

w/o Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

Result:

A

See step 2
CHECK DTC OUTPUT (HEALTH CHECK)
See step 3

Result

Proceed to

A

B

Result:

B

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ]

Result:

A

See step 3

Proceed to
A
B

Proceed to
A
B

READ VALUE USING TECHSTREAM (ECO SWITCH)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.

Enter the following menus: Body Electrical / Air Conditioner / Data List / ECO Switch.

Body Electrical > Air Conditioner > Data List

Tester Display
ECO Switch

Read the value displayed on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition
ECO Switch	ECO mode switch (satellite switch set) condition	ON or OFF	ECO mode switch (satellite switch set) not operated: OFF ECO mode switch (satellite switch set) being pushed and held: ON

Result

Result	Proceed to
The display changes according to the ECO mode switch (satellite switch set) operation.	A
The display does not change according to the ECO mode switch (satellite switch set) operation.	B

Turn the power switch off.

Result:

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [10/2017 - ]

Result:

See step 4

INSPECT ECO MODE SWITCH (SATELLITE SWITCH SET)

Inspect the ECO mode switch (satellite switch set).

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

REPLACE ECO MODE SWITCH (SATELLITE SWITCH SET). Refer to REMOVAL [10/2017 - ]

Result:

See step 5

CHECK HARNESS AND CONNECTOR (ECO MODE SWITCH (SATELLITE SWITCH SET) - BODY GROUND)

Disconnect the G49 ECO mode switch (satellite switch set) connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to ECO Mode Switch (Satellite Switch Set))

Standard Resistance

Tester Connection	Condition	Specified Condition
G49-7 (GND) - Body ground	Power switch off	Below 1 Ω

Reconnect the G49 ECO mode switch (satellite switch set) connector.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 6

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

Disconnect the G64 air conditioning amplifier assembly connector.
Disconnect the G49 ECO mode switch (satellite switch set) connector.

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

*a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)
*b	Front view of wire harness connector (to ECO Mode Switch (Satellite Switch Set))

Standard Resistance

Tester Connection	Condition	Specified Condition
G64-20 (ECOS) - G49-6 (ECU)	Power switch off	Below 1 Ω
G64-20 (ECOS) or G49-6 (ECU) - Body ground	Power switch off	10 kΩ or higher

Reconnect the G49 ECO mode switch (satellite switch set) connector.

Reconnect the G64 air conditioning amplifier assembly connector.

Result

Proceed to
OK
NG

Result:

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [10/2017 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR