| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Theft Deterrent/Keyless Entry | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002ZD1002X |
| Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Security Horn Circuit |
DESCRIPTION
When the theft deterrent system is operating, the main body ECU outputs a signal continuously at 0.4 second intervals, causing the security horn to sound.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY HORN) |
(a) Operate the Techstream according to the steps on the display and select Active Test.
Main Body
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Security Horn |
Security horn |
ON or OFF |
- |
OK:
Security horn operates normally.
|
|
2. |
INSPECT FUSE (MET-B) |
|
(a) Remove the MET-B fuse from the engine room relay block unit B. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
MET-B fuse |
Always |
Below 1 Ω |
|
|
3. |
INSPECT SECURITY HORN RELAY |
(a) Remove the security horn relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 - 5 |
When battery voltage is not applied between terminals 1 and 2 |
10 kΩ or higher |
|
When battery voltage is applied to terminals 1 and 2 |
Below 1 Ω |
|
|
4. |
INSPECT SECURITY HORN ASSEMBLY |
|
(a) Remove the security horn
|
(b) Check operation of the horn.
OK:
|
Measurement Condition |
Specified Condition |
|---|---|
|
Battery positive (+) → Terminal 1 Battery negative (-) → Horn bracket |
Horn sounds |
|
|
5. |
CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - BATTERY) |
|
(a) Remove the security horn relay from the engine room relay block. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Engine room relay block security horn relay terminal 1 - Body ground |
Always |
11 to 14 V |
|
Engine room relay block security horn relay terminal 3 - Body ground |
Always |
|
|
6. |
CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - SECURITY HORN) |
|
(a) Remove the security horn relay from the engine room relay block. |
(b) Disconnect the A33 security horn connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Engine room relay block security horn relay terminal 5 - A33-1 |
Always |
Below 1 Ω |
|
|
7. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SECURITY HORN RELAY) |
|
(a) Remove the security horn relay from the engine room relay block. |
(b) Disconnect the H1 main body ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Engine room relay block security horn relay terminal 2 - H1-6 (SH) |
Always |
Below 1 Ω |
|
|
|