| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Theft Deterrent/Keyless Entry | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000001PR401AX |
| Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
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
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 |
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn a Techstream main switch 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 or stop correctly when operating them through the Techstream.
|
|
3. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ENGINE ROOM JUNCTION BLOCK) |
(a) Disconnect the DB main body ECU connector.
(b) Remove the integration relay from the engine room junction block
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DB-1 - 1A-7 |
Always |
Below 1 Ω |
|
DB-1 or 1A-7 - Body ground |
Always |
10 kΩ or higher |
|
|
|