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 |
Precaution
PRECAUTION
1. IGNITION SWITCH EXPRESSION
HINT:
The type of ignition switch used on this model differs according to the specifications
of the vehicle. The expressions listed in the table below are used in this section.
Expression
Ign ...
Inspection
INSPECTION
PROCEDURE
1. CHECK BRAKE DISC INSIDE DIAMETER
(a) Using a brake drum gauge or equivalent, measure the inside diameter
of the disc.
Standard inside diameter:
210 mm (8.27 in.)
Maximum inside diameter:
211 mm (8.31 in.) ...