| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018WSY |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Distance Control Switch Circuit; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
Distance Control Switch Circuit |
DESCRIPTION
The distance control switch sets the vehicle-to-vehicle distance control mode. The distance control switch is installed in the steering pad switch. The vehicle-to-vehicle distance set value can be changed by operating the distance control switch (steering pad switch assembly) while the dynamic radar cruise control system is in operation. The steering pad switch uses the BEAN to communicate with each ECU. Therefore, it does not have a direct connection with the ECM. If there are any malfunctions in the communication line of the steering pad switch, one or more DTCs in the multiplex communication system are output.
WIRING DIAGRAM
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.
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![2016 - 2020 MY Sienna [12/2015 - ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: PRECAUTION](/t3Portal/stylegraphics/info.gif)
- When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
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) Enter the following menus: Powertrain / Radar Cruise 2 / Data List.
(e) Read the Data List according to the display on the Techstream.
Radar Cruise2
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Distance Control Switch |
Distance control switch signal/ON or OFF |
ON: Distance control switch on OFF: Distance control switch off |
Distance Control Switch |
OK:
When the steering pad switch assembly (vehicle-to-vehicle distance control switch) is operated, the display changes as shown above.
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
2. |
INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Remove the steering pad switch assembly.
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(b) Inspect the steering pad switch assembly.
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| NG |
|
|
|
3. |
INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY |
(a) Remove the spiral cable with sensor sub-assembly.
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(b) Inspect the spiral cable with sensor sub-assembly.
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| NG |
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - DRIVING SUPPORT ECU, BODY GROUND) |
(a) Disconnect the D149 spiral cable with sensor sub-assembly connector (w/ Steering Heater).
(b) Disconnect the D21 spiral cable with sensor sub-assembly connector (w/o Steering Heater).
(c) Disconnect the A80 driving support ECU assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (w/ Steering Heater):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D149-12 (DIST) - A80-23 (SPSW) |
Always |
Below 1 Ω |
|
D149-2 (ECC) - Body ground |
Always |
Below 1 Ω |
|
D149-12 (DIST) or A80-23 (SPSW)- Body ground |
Always |
10 kΩ or higher |
Standard Resistance (w/o Steering Heater):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D21-4 (DIST) - A80-23 (SPSW) |
Always |
Below 1 Ω |
|
D21-2 (ECC) - Body ground |
Always |
Below 1 Ω |
|
D21-4 (DIST) or A80-23 (SPSW)- Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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