DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SECURITY HORN)
INSPECT FUSE (SECURITY)
INSPECT SECURITY RELAY
INSPECT SECURITY HORN ASSEMBLY
CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] AND SECURITY HORN)
THEFT DETERRENT SYSTEM (w/ Entry and Start System) - Security Horn Circuit
DESCRIPTION
When the theft deterrent system is operating, the certification ECU (smart key ECU assembly) outputs a signal continuously at 0.4 second intervals, causing the security horn to sound.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SECURITY HORN) |
Operate the intelligent tester according to the steps on the display and select "Active Test".
Entry&Start| Tester Display | Test Part | Control Range | Diagnostic Note |
| Security Horn | Security horn | ON/OFF | - |
- OK:
- Security horn operates normally.
| OK | |
| |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
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| 2.INSPECT FUSE (SECURITY) |
Remove the SECURITY fuse from the No. 2 engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| SECURITY fuse | Always | Below 1 Ω |
Remove the security relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 3 - 5 | Battery voltage is not applied to terminals 1 and 2 | 10 kΩ or higher |
| 3 - 5 | Battery voltage is applied to terminals 1 and 2 | Below 1 Ω |
| 4.INSPECT SECURITY HORN ASSEMBLY |
Remove the security horn ().
Apply battery voltage to the horn connector and check the operation of the horn.
- OK:
| Measurement Condition | Specified Condition |
Battery positive (+) → Terminal 1
Battery negative (-) → Horn bracket | Horn sounds |
| | REPLACE SECURITY HORN ASSEMBLY ()
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| 5.CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] AND SECURITY HORN) |
Remove the SECURITY relay from the engine room relay block.
Disconnect the E30 ECU connector.
Disconnect the A19 horn connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| Relay block security relay terminal 1 - E30-20 (SH-) | Always | Below 1 Ω |
| Relay block security relay terminal 3 - A19-1 | Always | Below 1 Ω |
| E30-20 (SH-) Body ground | Always | 10 kΩ or higher |
| A19-1 - Body ground | Always | 10 kΩ or higher |
Measure the voltage according to value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| Relay block security relay terminal 2 - Body ground | Always | 11 to 14 V |
| Relay block security relay terminal 5 - Body ground | Always | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
| |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
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