Anti theft alarm preventing car from starting?

Tiny
AMAN123
  • MEMBER
  • 2012 HONDA ACCORD
  • 190,000 MILES
My car’s anti theft alarm got activated, nothing is working now, couldn’t start my car. Please tell me what should I do.
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Friday, May 3rd, 2019 AT 5:04 AM

20 Replies

Tiny
KEN
  • ADMIN
Hello,

I would disconnect the battery for 5 minutes and then turn the key on, then reconnect the battery here is a guide that will tell you more on how to reset the security system.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.
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Saturday, May 4th, 2019 AT 12:21 PM
Tiny
CHOELLEJ
  • MEMBER
  • 2005 HONDA ACCORD
  • 6 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Help, my car listed above Coupe wont go in gear the alarm is going off and lights are flashing. My fob is fine with the battery need to go to work.
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Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
KASEKENNY1
  • EXPERT
Just so I understand, the engine starts, the alarm is going off but it won't go in gear? If the engine starts, that will make this very odd.

However, if the engine does not start then we have an active theft system and this is causing the not going into gear issue.

Here is a guide on security systems. If disarming the system that is spelled out here does not work, you can try to leave the key in the ignition for 30 minutes in the on position and see if the alarm will deactivate.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Maybe getting a video of what it is doing will get us on the same page if I am not stating this correctly. Thanks
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Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
ISAAC BRIGHT
  • MEMBER
  • 2004 HONDA ACCORD
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 203,000 MILES
I just purchased this car, the immobilizer light always is flashing and it's throwing code p0603. I've replaced both the car and key batteries. The car cranks and runs like it should but the transmission will not go into gear. I can't push the button and the little hole that your supposed to be able to shift gears with it off will not work either. Any help?
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Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
KEN
  • ADMIN
P0603 DTC code which refers to the Keep Alive Memory in the PCM power-train control module. This is telling us the PCM needs to be replaced or the internal battery replaced. (I am not sure if you can replace the battery.) This should take care of the security issue as well. Here is the PCM location and how to replace it. Please give your VIN number to the re-builder when purchasing the unit.

HDS Clear Command

The ECM/PCM stores various specific data to correct the system even if there is no electrical power such as when the battery negative terminal or No. 8 FI ECU (ECM/PCM) (15 A) fuse are disconnected. Stored data based on failed parts should be cleared by using the "CLEAR COMMAND" of the HDS, if parts are replaced.

The HDS has three kinds of clear command to meet the purpose. They are DTC clear, ECM/PCM clear, and CKP pattern clear. DTC clear command erases all stored DTC codes, freeze data, and readiness codes. This must be done with the HDS after reproducing the DTC during troubleshooting. The ECM/PCM clear command erases all stored DTC codes, freeze data, readiness codes, and all specific data to correct the system except CKP pattern. If the CKP pattern data in the ECM/PCM was cleared, you must do the CKP pattern learn procedure. The CKP pattern clear command erases only CKP pattern data. This command is for repair of a misfire or the CKP sensor.

DTC CLEAR

1. Clear the DTC with the HDS while the engine is stopped.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II). Wait for 30 seconds.
4. Turn the ignition switch OFF, and disconnect the HDS from the DLC.

ECM/PCM RESET

This command clears stored specific data from each vehicle such as DTCs, freeze data, and readiness codes. It does not clear CKP PATTERN data.

1. Reset the ECM/PCM with the HDS while the engine is stopped.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II). Wait for 30 seconds.
4. Turn the ignition switch OFF, and disconnect the HDS from the DLC.
5. Do the ECM/PCM idle learn procedure.

CKP PATTERN CLEAR/CKP Pattern Learn Procedure

Enable Criteria

ECT at 176 F (80 C) or higher.

Procedure

1. Clear the CKP pattern with the HDS while the engine is stopped.
2. Turn the ignition OFF.
3. Turn the ignition ON (II), and wait for 30 seconds.
4. Test-drive the vehicle on a level road. Decelerate (with the throttle fully closed) from an engine speed of 2,500 rpm to 1,000 rpm with the A/T in 2, or the M/T in 2nd or 3rd gear.
5. Stop the vehicle. Do not turn the ignition off.
6. Select the ALL DATA LIST in the DATA LIST MENU of the HDS.
7. Check the status of PULSER F/B LEARN. If it is set to NG, the enable criteria was probably not met; repeat the procedure from the beginning.

How to End a Troubleshooting Session (required after any troubleshooting)

1. Reset the ECM/PCM with the HDS.
2. Do the ECM/PCM idle learn procedure.
3. Turn the ignition switch OFF.
4. Disconnect the HDS from the DLC.

NOTE: The ECM/PCM Is part of the immobilizer system. If you replace the ECM/PCM, it will have a different immobilizer code. In order for the engine to start, you must rewrite the immobilizer code with the HDS.

Check out the diagrams (below). Please let us know what happens.
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-1
Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
BIGWHODINI
  • MEMBER
  • 2004 HONDA ACCORD
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
My key fob doesn't work to lock or unlock the doors, but it will start my car. I have a replacement key, key fob and new case. My question is, do I transfer the immobilizer to the new key?
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Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

You will need to register the new key with the immobilizer on your vehicle. It requires a Honda diagnostic scan tool or equal. If this isn't done, the vehicle will not recognize the new key and the engine won't run. It can be done without the old key, but.

Here are the directions:

2004 Honda Accord L4-2.4L
Immobilizer Key Registration
Vehicle Accessories and Optional Equipment Antitheft and Alarm Systems Testing and Inspection Programming and Relearning Immobilizer Key Registration
IMMOBILIZER KEY REGISTRATION
Immobilizer Key Registration

NOTE:
- The HDS is required for registration of the immobilizer keys.
- Check for aftermarket electrical equipment that can cause problems with transponder operation.
- The immobilizer control unit-receiver can store up to six immobilizer Keys.

Add a new key

1. Have a registered key, a new immobilizer key, and the first pass word from the IN system.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch ON (II).
4. Select "IMMOBILIZER" from the "SYSTEM SELECT" menu.
5. Select "Keys", then "Add 1 key".
6. Do the registration according to the instruction of HDS screen.
7. Check if the engine can be started by the newly registered key.

Add new keys

1. Have a registered key, all new keys, and the immobilizer PCM code.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch ON (II).
4. Select "IMMOBILIZER" from the "SYSTEM SELECT" menu.
5. Select "Add and Delete Keys", or "Delete or Add Multiple Keys".
6. Do the registration according to the instruction of HDS screen.
7. Check if the engine can be started by all the registered keys.

Replace any of the keys

NOTE: If any of the registered keys were lost, do the following procedure to delete the lost registered key.

1. Have at least one original key, all other keys to be registered and the immobilizer PCM code.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch ON (II).
4. Select "IMMOBILIZER" from the "SYSTEM SELECT".
5. Select "KEYS", then "REWRITE KEYS".
6. Do the registration according to the instruction of HDS screen.
7. Check if the engine can be started by all the registered keys.

All keys are lost

1. Prepare all new keys and have the immobilizer PCM code.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch ON (II).
4. Select "IMMOBILIZER" from the "SYSTEM SELECT" menu.
5. Select "KEYS", then "ALL KEYS LOST".
6. Do the registration according to the instruction of HDS screen.
7. Check if the engine can be started by all the registered keys.

_______________________________-

I have a feeling this isn't what you wanted to hear. If you have other questions, let me know.

Take care,
Joe
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Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
BIGWHODINI
  • MEMBER
Thanks bro.
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Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
No problem. Is that what you needed?

Joe
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+1
Saturday, September 26th, 2020 AT 1:16 PM (Merged)
Tiny
YUJURES1
  • MEMBER
  • 2004 HONDA ACCORD
  • 2.4L
  • 4 CYL
  • 2WD
  • 150,000 MILES
Does not send ground to main relay 's.
D4 intermittent.
*If I put direct ground to min relay if it turns on but there is no current in transmission.
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
KEN
  • ADMIN
Yes, the security system is engaged. lets try to reset the system. please use this guide and get back to me:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
ZAYMONEY
  • MEMBER
  • 2004 HONDA ACCORD
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 100 MILES
I recently bought my first car and every time I turn off the car my head lights flash. My horn fuse is blown, but the security system is going off. So I have to turn off and on my car to get the lights to turn off and play with the controls for headlight. The steering column has been changed out and my driver door inoperable because the cylinder damage. It drives and turns on, the remote does not unlock and lock doors. How do I fix it?
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
KEN
  • ADMIN
Hello,
It sounds like the door lock is the issue it must work so the security system can be disarmed. Here is a wring diagram of the alarm system so you can see how it works. Can I ask what happens tot he door lock and what do you need to fix it? It sounds like one of the horns is shorted causing the fuse to blow. You can see by the wiring diagrams the door locks and latches must be working. Also, check the system fuses. The wiring diagrams will show you which ones.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please run this test and get back to us.

Cheers, Ken
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
COLINDEBEAN
  • MEMBER
  • 2004 HONDA ACCORD
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 45,000 MILES
My Honda Accord V6 is equipped with a secyrity system that will sound the horn and alternate with flashing the headlights, parking lights, side marker lights and taillights if someone attemps to break into the car or tries to remove the radio.
My problem is: Since the last time I brought it to the dealers' workshop for oil change and maintenance this alarm goes on for no reason at all when the car is parked and the doors are locked! This can happen at any time of the day or night, inside the garage, in the driveway or on a parking place. I brought my car back to the dealer's workshop to have this problem solved, they checked the computer and the security system for 1 hour and a half but unfortunately the problem did not show up while I was there, Cost: $110.00 no results" This problem is very annoying, as I have to reset the alarm with the remote transmitter and this may take a few seconds before it is done. My scare is that my neighbours will soon start to throw rocks at my car? Thanks for your help!

RAY.
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Hi RAY,

The triggering points for the alarm are the door and hood switches. Most often an out of alignment door would cause the door switch to come into contact triggering the alarm.

This guide can help us

https://www.2carpros.com/articles/how-to-reset-a-security-system

If you have in instances witnessed the door ajar indicator flashing while driving, the at least one of the door switch is not fully in contact. Check the door switches for missing rubber seals, stoppers.

The other item to check would be the hood switch, ensure it is correctly adjusted.
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
COLINDEBEAN
  • MEMBER
Thank you very much KHLow2008 for the answer you gave me for my alarm problem! I will certainly check all those items you mentioned and return here with the results soon A+.
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
KKHONDAACCORD
  • MEMBER
  • 2004 HONDA ACCORD
2004 Honda Accord

I have an antitheft device installed in my car. I have 2 keyless entry remote. Both were working fine. Yesterday I parked my car with locking it with my remote. But after 2 hours when I tried to unlock it would not unlock. When I used my keys to open the door, the arlam starts beeping loudly and also I cannot start the car. And it's with both the remotes. I even tried changing remote batteries. So, I disconnected the fuse, and I can drive the car, open the doors manually by keys. When I reconnect the fuse, the same problem starts. I don't even know where the antitheft was installed. Is there something that I can do myself to reset the arlam?
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Hi Kkhondaaccord,

Do you mean the alarm is an aftermarket system?
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
KKHONDAACCORD
  • MEMBER
The antitheft was installed after 3 yrs the car was bought. I don't know which exactly is it, but it has python and Clifford remotes.
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Aftermarket alarm system comes in many varieties and each have different reset methods. Most would be equipped with a reset button. Check underdash for a small push button type switch and turn ignition switch to ON then press the switch to reset.

If that fails, remove the alarm fuse, turn ignition switch on and plug in the alarm fuse.

After resetting the alarm if the remotes do not work, reprogramming would be required.
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Saturday, September 26th, 2020 AT 1:17 PM (Merged)

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