DESCRIPTION
When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the horn(s) to sound.
WIRING DIAGRAM
PROCEDURE
1. |
CHECK HORN OPERATION |
(a) Press the horn switch and check if the horn(s) sound.
OK:
Horn(s) operate normally.
NG |
GO TO HORN SYSTEM |
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (VEHICLE HORN) |
(a) Operate the Techstream according to the steps on the display and select Active Test (See page ).
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Vehicle Horn |
Vehicle horn(s) |
ON/OFF |
- |
OK:
Horn(s) operate normally.
OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
3. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU) |
(a) Disconnect the 1C relay connector.
(b) Remove the main body ECU (See page ).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1C-7 - A-28 (HORN) |
Always |
Below 1 Ω |
1C-7 or A-28 (HORN) - Body ground |
Always |
10 kΩ or higher |
OK |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Toyota dealer as soon as possible.
Visible symptoms
• Fluid leaks under the vehicle (Water dripping from the air
conditioning after use is norm ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" ...