| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000ZL62 |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Horn Circuit; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
Horn Circuit |
DESCRIPTION
When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU transmits a signal to cause the horn to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
INSPECT HORNS |
(a) Press the horn switch and check if the horns sound.
Result
|
Result |
Proceed to |
|---|---|
|
Horns sound |
A |
|
Horns do not sound |
B |
| B |
|
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Select the item below in the Active Test and then check that the horns operate.
Main Body
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Vehicle Horn |
Vehicle horns |
ON / OFF |
- |
OK:
The vehicle horns sound and stop correctly when operated through the Techstream.
| NG |
|
|
|
3. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
(a) Remove the main body ECU from instrument panel junction block assembly (See page
|
|
![2016 - 2020 MY Sienna [12/2015 - ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL](/t3Portal/stylegraphics/info.gif)
(b) Disconnect the instrument panel junction block assembly connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2I-28 (HORN) - 2F-16 |
Always |
Below 1 Ω |
|
2I-28 (HORN) - 2D-39 |
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG |
|
|
|