Toyota Corolla Cross: Security Horn Circuit
DESCRIPTION
When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn assembly to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
for HEV Model:
Click here
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for Gasoline Model:
Click here
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. | PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Main Body > Active Test|
Tester Display | Measurement Item |
Control Range | Diagnostic Note |
|---|---|---|---|
|
Security Horn | Security horn Assembly |
OFF/ON | - |
|
Tester Display |
|---|
| Security Horn |
OK:
The security horn assembly sounds and stops correctly when operated through the GTS.
| OK | .gif) | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
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| 2. |
INSPECT SECURITY HORN ASSEMBLY |
Click here
| NG | |
REPLACE SECURITY HORN ASSEMBLY |
|
| 3. |
INSPECT S-HORN RELAY |
| (a) Remove the S-HORN relay from the No. 1 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 | Auxiliary battery voltage not applied between terminals 1 and 2 |
10 kΩ or higher |
|
3 - 5 | Auxiliary battery voltage applied between terminals 1 and 2 |
Below 1 Ω |
| NG | | REPLACE S-HORN RELAY |
|
| 4. |
INSPECT POWER DISTRIBUTION BOX ASSEMBLY |
(a) Remove the main body ECU (multiplex network body ECU).
Click here
|
*a | Component without harness connected (Power Distribution Box Assembly) |
- | - |
(b) Disconnect the 8E power distribution box assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
8E-4 - MB-24 (SH) | Always |
Below 1 Ω |
| NG | | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
|
| 5. |
CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - S-HORN RELAY) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
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| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. |
CHECK HARNESS AND CONNECTOR (S-HORN RELAY - SECURITY HORN ASSEMBLY) |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. |
CHECK HARNESS AND CONNECTOR (S-HORN RELAY - POWER DISTRIBUTION BOX ASSEMBLY) |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
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Procedure Part Name Code
1 LOWER STEERING COLUMN COVER
45287
- -
2 T
Removal
REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL)
Procedure Part Name Code
1 AIR CONDITIONER UNIT ASSEMBLY
- -
- -
2 TRANSPONDER KEY
SEE MORE:
Precaution
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