[thscott]

My information is correct to find the cause of unwanted alarms.

If the hood switch is disconnected and the alarms stop, the hood switch or its adjustment is the problem. If the alarms continue, the problem is somewhere else.

You are also correct - to jumper the hood switch connector disables the alarm system.

It depends on the goal: to find the problem, or to bury it.

What you say here is correct. Sometimes random alarms are caused by a faulty hood latch switch. But what you posted in #4 indicated that jumpering the hood switch connector would cause the alarm to go off. In fact it disables the alarm because the system thinks the hood is open.

 

[davedrivesody]

Yeah, you're right, I was wrong on that point. (Edited the post to correct the error.)

One thing I like about the forums is others who take the time to correct erroneous information. The result is increased quality of the content.

Humble pie is bittersweet, though.

 

[celicool]

How do you know jumping the hood switch (mentioned here by thscott) will fool the system and disable your alarm?
Answer: the lights will not flash when you press the lock button on your fob, and the honk will not sound when you press the lock button twice. But your doors will lock.

But, why the heck the lights flash when I do the unlock button

 

[thscott]

How do you know jumping the hood switch (mentioned here by thscott) will fool the system and disable your alarm?
Answer: the lights will not flash when you press the lock button on your fob, and the honk will not sound when you press the lock button twice. But your doors will lock.

But, why the heck the lights flash when I do the unlock button

Also, the blinking light on the dash does not blink, indicating the alarm system is not armed.

 

[davedrivesody]

But, why the heck the lights flash when I do the unlock button

Normal.

The lights blink with door unlock even if the alarm is disarmed.

 

[celicool]

Normal.

The lights blink with door unlock even if the alarm is disarmed.

Very true! I forgot about that.

 

[diyron]

This thread helped me but was at first a little confusing. So here's a summary of what everyone has contributed for us dummies:

1. Disconnecting the plug to the hood latch switch indicates to the system that the hood is closed. If the hood latch switch was the problem then that fixes it, though leaving the hood unprotected.

2. Shorting out the plug (i.e., connecting the two wires together) indicates to the system that the hood is open. This prevents the alarm from arming because it won't arm if any door is open. So this fixes the problem even if the problem is somewhere else (e.g., another door or rear hatch). But it also leaves the vehicle unprotected.

In my case the peace and quiet was much more valuable than the protection of the alarm!

 

[thscott]

This thread helped me but was at first a little confusing. So here's a summary of what everyone has contributed for us dummies:

1. Disconnecting the plug to the hood latch switch indicates to the system that the hood is closed. If the hood latch switch was the problem then that fixes it, though leaving the hood unprotected.

2. Shorting out the plug (i.e., connecting the two wires together) indicates to the system that the hood is open. This prevents the alarm from arming because it won't arm if any door is open. So this fixes the problem even if the problem is somewhere else (e.g., another door or rear hatch). But it also leaves the vehicle unprotected.

In my case the peace and quiet was much more valuable than the protection of the alarm!

Excellent summary! Thank you. Welcome to this forum!

 

[kaimanson]

I just started to have a similar issue just today. Came back from work, got in..kids were playing outside. Wife comes in, and told me the Ody alarm went off?...I was like...nahh..(I was vacuuming so, couldn't hear a thing)...again about 30mins later while the kids are doing homework the alarm goes off ... I'm thinking is someone else, went outside and the Ody alarm is beeping...turn it off with the FOB. Try to lock it up twice...and the horn doesn't go off. I try unlock - then lock twice horn doesn't beep. Red light confirming that the alarm is armed, is not coming on.

After researching here, I disconnected the hood latch, try unlocking/locking using the key lock and still the alarm doesn't get armed (no beep after locking twice and no red light on the gauge). The only way I can armed the alarm even hear the beep is while being inside the car doors unlocked I turn the ignition to the ACC position then back to LOCK, I remove the key, press lock on the fob twice...doors locked, horn beep and red light comes on....weird thing is that the windows switches light stays on....will try to make a video soon.

 

[Bear3412]

Again, did these issues develop during or after rain?

Did anyone have these issues with an always "dry" / garage kept van?

Water infiltration is a possible cause. Any other odd electrical issues?

Ever heard of the roof rail seam leakage issue?

JMT

 

[kaimanson]

Again, did these issues develop during or after rain?

Did anyone have these issues with an always "dry" / garage kept van?

Water infiltration is a possible cause. Any other odd electrical issues?

Ever heard of the roof rail seam leakage issue?

JMT

I had a similar situation a few years back in the Middle of the night the alarm went off, but the alarm kept arming without issues. I did the roof seams and everything was fine, two leaks were fixed. Rear trunk and passenger side kick panel. I have checked the kick panel area en everything looks dry. I took the car to the cars wash on Saturday, but compared to the storms we usually have down here...it is nothing. I'll have to take a look at the wires again behind the passenger area. Car is always outside.

 

[kaimanson]

Update: didn't do anything, yesterday morning was having the same issue, I drove to work and after parking I pressed that bad boy twice and beep beep...we are back in business. Anyways I will take a look at the passenger kick panel wires for any wet spots.

 

[flyboy161]

Oh my gosh! @marky69, that was the funniest post I’ve read in awhile. Anyhoo, I recently acquired a 2004 Odyssey EX and I’m working through some gremlins. One was a busted junction switch on the right sliding door. None of the locks lock or unlock with the fob or the drivers door switch except the lift gate and it only locks or unlocks with the drivers door switch. Odd, but no alarm issues.

So, I ordered a new junction switch and installed it yesterday. Door locks still don’t work right but today my alarm went off for no apparent reason. I went out and unlocked the drivers door and came in to research the issue. Found a thread that discussed disconnecting the hood switch. I did that. Shut everything and locked the door and went back inside. Two hours later, my alarm is going off again.
I’ll jumper the connector to the hood switch in the morning but to get back to the junction switch. What a strange design that is with plungers and stationary targets.

The terminal “I” was broken out. That’s the feed from the passenger multiplex through the unlock side of the door switch to ground through pin “K”. I’m suspecting that door lock actuator has failed and fixing the junction switch now triggers the alarm randomly for some unknown so far reason. I know the hood switch wire jumper is temporary but I need to be able to lock this van without disturbing everyone everywhere. For now the van is unlocked.

 

[Schreck]

Hi everyone. Bottom line up front, a fuse box replacement is what finally fixed our random alarm problem. We got a new front hood latch and back door latch out of the 4 month troubleshooting process though . Got the fuse box cheap from an auto salvage yard and had the dealer install for under $150. Hope this helps someone out there.

 

[marvinstockman]

Schrect, which fuse box? On mine, the box by the driver's foot was wet.

 

[kaimanson]

Passenger for me...

 

[davedrivesody]

Both the driver and passenger side fuse boxes are used by the security system; both have multiplexers; both multiplexers are also used.

It's easy to see how water in either one could cause unusual security system issues.

 

[Bear3412]

Did everyone see @marky69 posts?

Post # 6, 7, & 9.

Solution could be simple door switches / plungers.
Fascinating.

 

[VanIslandguy]

Glad it's fixed!

Sometimes it is easier to replace inexpensive parts than spend hours trying to troubleshoot them.

Seems like it would be easier to cut alarm off from ever going on randomly.

 

[VanIslandguy]

Did everyone see @marky69 posts?

Post # 6, 7, & 9.

Solution could be simple door switches / plungers.
Fascinating.

Can I just pull out fuses for alarm or horn? Where is fuse location for alarm?