Checking Alarm Function

Checking alarm function

Checking alarm function
Alarm function activation does not work. This means that the horn does not sound and the headlamps and turn signal lamps do not flash.
Cause of fault:
- No voltage to the alarm control module
- Non-functioning alarm control module
- Open-circuit or loose connections in the wiring between the alarm control module and the alarm button
- Short-circuit to ground in the reset button
- Faulty fuses.
Check that the alarm control module fuses are undamaged. These are located in the fusebox in the cargo compartment.

Checking the alarm control module
Check the alarm control module connectors. Check for loose connections, contact resistance and oxidation.
Check the cable between the alarm control module and the alarm button. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between terminals #B1 and #B7. The voltage must be approximately 12 V.
Measure the voltage on the alarm control module connector terminal #B4. The voltage should be 12 V.

Checking the alarm button
Measure the voltage on alarm control module connector #A2 when the alarm button is pressed. The voltage must be approximately 12 V.
Measure the voltage on alarm control module connector #A2 when the alarm button is not pressed. The voltage must be approximately 0 V.

Hint: The alarm button is located under the steering column cover.

Checking the reset button
Disconnect the alarm control module 8 pin connector (connector B).
Check the cable between the reset button and connector #B6. Check for a short-circuit to ground.
Measure the resistance of the control module connector #B6 and chassis ground when the reset button is not pressed.
Resistance must be higher than 1 Mohms.
Measure the resistance of the control module connector #B6 when the reset button is pressed. The resistance must be approximately 0 ohms.

Hint: The reset button is located in the cowl in the engine compartment.

Remedy as necessary.

Other information
- For information about signals, see Signal specification, attack alarm control module Signal Specification, Attack Alarm Control Module
- To access or replace the alarm control module see Replacing the attack alarm control module Service and Repair
- For further information about the fuses and relays, see the Wiring Diagram
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Press the alarm button below the steering column cover.
Check that the headlamps and turn signal lamps flash.
Check that a pulsing sound is heard from the horn.
The reset button is located in the cowl in the engine compartment.
The turn signal lamps and headlamps should stop flashing and the horn should fall silent.

Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking alarm function

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