Pattern Select Switch Eco Mode Circuit [10/2013 - ]: Procedure

READ VALUE USING TECHSTREAM (CAN BUS CHECK) See step 2
B → See step 10

A: Go to next step
CHECK DTC OUTPUT (HEALTH CHECK) See step 3
B → GO TO DTC CHART

A: Go to next step

PERFORM ACTIVE TEST USING TECHSTREAM (COMBINATION METER)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Body Electrical / Combination Meter / Active Test / Indicat. ECO Mode.

Perform the "Indicat. ECO Mode" Active Test.

Tester Display	Description	Inspection Condition	Specified Condition
Indicat. ECO Mode	ECO mode indicator light	ECO mode	Comes on

Result

Result	Proceed to
The ECO mode indicator light comes on	A
The ECO mode indicator light does not come on	B

B → See step 11

A: Go to next step

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 Conditioning / Data List / ECO Switch.

Read the value displayed on the Techstream.

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ECO Switch	ECO MODE switch condition/ ON or OFF	ECO MODE switch ON: ON ECO MODE switch OFF: OFF	-

Result

Result	Proceed to
The Techstream display changes according to the ECO MODE switch operation.	A
The Techstream display does not changes according to the ECO MODE switch operation.	B

B → See step 5

A → See step 9

INSPECT INTEGRATION CONTROL AND PANEL SUB-ASSEMBLY (ECO MODE SWITCH)

Remove the integration control and panel sub-assembly (ECO MODE switch).

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Condition	Specified Condition
L78-2 (ECU) - L78-5 (E)	ECO MODE Switch ON	Below 1 Ω
L78-2 (ECU) - L78-5 (E)	ECO MODE Switch OFF	10 kΩ or higher

TEXT IN ILLUSTRATION

*1	Component without harness connected (Integration Control and Panel Sub-assembly (ECO MODE Switch))

Install the integration control and panel sub-assembly.

NG → See step 8

OK: Go to next step

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

Disconnect connector L78 from the integration control and panel sub-assembly (ECO MODE switch).

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Condition	Specified Condition
L78-5 (E) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Integration Control and Panel Sub-assembly (ECO MODE Switch))

Connect the integration control and panel sub-assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

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

Disconnect connector L78 from the integration control and panel sub-assembly (ECO MODE switch).
Disconnect connector L17 from the air conditioning amplifier assembly.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
L78-2 (ECU) - L17-15 (ECOS)	Always	Below 1 Ω
L78-2 (ECU) or L17-15 (ECOS) - Body ground	Always	10 kΩ or higher

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Integration Control and Panel Sub-assembly (ECO MODE Switch))
*2	Rear view of wire harness connector (to Air Conditioning Amplifier Assembly)

Connect the air conditioning amplifier assembly connector.
Connect the integration control and panel sub-assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 12

REPLACE INTEGRATION CONTROL AND PANEL SUB-ASSEMBLY (ECO MODE SWITCH). Refer to COMPONENTS [10/2013 - ]
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2013 - ]
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2013 - ]
CHECK METER / GAUGE SYSTEM. Refer to PROBLEM SYMPTOMS TABLE [10/2013 - ]
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to COMPONENTS [10/2013 - ]