Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJHX
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Ignition Switch Circuit; 2016 MY Sienna [12/2015 - 08/2016]

Ignition Switch Circuit

DESCRIPTION

The main body ECU determines the ignition switch position (OFF, ACC, ON) based on signals from the IG or ACC circuit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Select the items below in the Data List and read the display on the Techstream.

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

IG SW

Ignition switch ON signal/ON or OFF

ON: Ignition switch ON

OFF: Ignition switch off

-

ACC SW

Ignition switch ACC signal/ON or OFF

ON: Ignition switch ACC

OFF: Ignition switch off

-

OK:

When the ignition switch is operated, the display changes as shown in the table.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)

(a) Disconnect the 2K instrument panel junction block assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2K-1 - Body ground

Always

11 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to Instrument Panel Junction Block Assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT IGNITION SWITCH ASSEMBLY

(a) Remove the ignition switch assembly (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE STARTING: IGNITION SWITCH: REMOVAL ).

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

2 - 3

Ignition switch ON

Below 1 Ω

2 - 4

3 - 4

2 - 3

Ignition switch ACC

Below 1 Ω

Text in Illustration

*1

Component without harness connected

(Ignition Switch Assembly)

*a

LOCK Position

*b

ACC Position

*c

ON Position

*d

Start Position

NG

REPLACE IGNITION SWITCH ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - INSTRUMENT PANEL JUNCTION BLOCK)

(a) Reinstall the ignition switch assembly (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE STARTING: IGNITION SWITCH: INSTALLATION ).

(b) Disconnect the 2A instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

2A-16 - 2A-38

Ignition switch ON

Below 1 Ω

2A-17 - 2A-38

Ignition switch ACC

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)

(a) Disconnect the 2D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2D-5 - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

REPLACE MAIN BODY ECU

(a) Temporarily replace the main body ECU with a new or normally functioning one (See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL ).

NEXT

7.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Select the items below in the Data List and read the display on the Techstream.

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

IG SW

Ignition switch ON signal/ON or OFF

ON: Ignition switch ON

OFF: Ignition switch off

-

ACC SW

Ignition switch ACC signal/ON or OFF

ON: Ignition switch ACC

OFF: Ignition switch off

-

OK:

When the ignition switch is operated, the display changes as shown in the table.

OK

END (MAIN BODY ECU IS DEFECTIVE)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY