Pattern Select Switch Eco Mode Circuit [04/2018 - 08/2020]: Procedure

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

See step 2

Result

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

Result:

GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ]

Result:

See step 2

CHECK DTC OUTPUT (HEALTH CHECK)

See step 3

Result

Result	Proceed to
No DTCs are output	A
DTCs are output	B

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2020]

Result:

See step 3

READ VALUE USING TECHSTREAM (ECO SWITCH)

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

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 drive mode switch condition	ON or OFF	ECO drive mode switch being pushed and held: ON ECO drive mode switch not operated: OFF

Result

Result	Proceed to
The Techstream display changes according to the ECO drive mode switch operation	A
The Techstream display does not change according to the ECO drive mode switch operation	B

Result:

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [04/2018 - 08/2020]

Result:

See step 4

INSPECT ECO DRIVE MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)
Refer to PROCEDURE - Step 1

Result

Proceed to

OK

NG

Result:

NG

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY. Refer to REMOVAL [04/2018 - ]

Result:

OK

See step 5

CHECK HARNESS AND CONNECTOR (ECO DRIVE MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) - BODY GROUND)

Disconnect the G24 ECO drive mode switch (electric parking brake switch assembly) 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 Drive Mode Switch (Electric Parking Brake Switch Assembly))

Standard Resistance

Tester Connection	Condition	Specified Condition
G24-16 (GND1) - Body ground	Always	Below 1 Ω

Reconnect the G24 ECO drive mode switch (electric parking brake switch assembly) 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 DRIVE MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))

Disconnect the G36 air conditioning amplifier assembly connector.
Disconnect the G24 ECO drive mode switch (electric parking brake switch assembly) 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 Drive Mode Switch (Electric Parking Brake Switch Assembly))

Standard Resistance

Tester Connection	Condition	Specified Condition
G36-20 (ECOS) - G24-11 (ECU)	Always	Below 1 Ω
G36-20 (ECOS) or G24-11 (ECU) - Body ground	Always	10 kΩ or higher

Reconnect the G24 ECO drive mode switch (electric parking brake switch assembly) connector.

Reconnect the G36 air conditioning amplifier assembly connector.

Result

Proceed to
OK
NG

Result:

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [04/2018 - 08/2020]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR