Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018K3Y
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): Steering Pad Switch Circuit; 2018 - 2020 MY Sienna [11/2017 -        ]

Steering Pad Switch Circuit

DESCRIPTION

The driving support ECU assembly receives a lane departure alert switch signal from the steering pad switch assembly and sends the signal to the forward recognition camera via CAN communication.

WIRING DIAGRAM

w/ Steering Heater

w/o Steering Heater

CAUTION / NOTICE / HINT

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: PRECAUTION

PROCEDURE

1.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / CAN Bus Check.

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

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK FOR DTCs (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Health Check.

(e) Check DTCs.

(f) Turn the ignition switch off.

Result

Proceed to

No DTCs are output.

A

DTCs are output.

B

B

GO TO DTC CHART

A

3.

INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING WHEEL: REMOVAL

(b) Inspect the steering pad switch assembly.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING WHEEL: INSPECTION

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

4.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

(a) Remove the spiral cable with sensor sub-assembly.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: REMOVAL

(b) Inspect the spiral cable with sensor sub-assembly.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: INSPECTION

Result

Proceed to

OK (w/ Steering Heater)

A

OK (w/o Steering Heater)

B

NG

C

B

GO TO STEP 6

C

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

A

5.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY)

(a) Disconnect the D149 spiral cable with sensor sub-assembly connector.

(b) Disconnect the A80 driving support ECU assembly connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

D149-12 (DIST) - A80-23 (SPSW)

Always

Below 1 Ω

D149-2 (ECC) - Body ground

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

D149-12 (DIST) or A80-23 (SPSW) - Body ground

Always

10 kΩ or higher

(d) Connect the A80 driving support ECU assembly connector.

(e) Connect the D149 spiral cable with sensor sub-assembly connector.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY)

(a) Disconnect the D21 spiral cable with sensor sub-assembly connector.

(b) Disconnect the A80 driving support ECU assembly connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

D21-4 (DIST) - A80-23 (SPSW)

Always

Below 1 Ω

D21-2 (ECC) - Body ground

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

D21-4 (DIST) or A80-23 (SPSW) - Body ground

Always

10 kΩ or higher

(d) Connect the A80 driving support ECU assembly connector.

(e) Connect the D21 spiral cable with sensor sub-assembly connector.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR