used car with alarm, 04 tundra, code alarm

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lectricguy

Copper - Posts: 359

Joined: March 18, 2008

Location: Rhode Island, United States

Posted: April 27, 2010 at 5:24 AM / IP Logged

Howie-

Good point. I believe j.w. bought the vehicle with the system installed that way--no idea why the installer used 2 relays. The one not working is the lock relay per Audiovox diagram--the one in the unlock position--replacing a diode--works just fine. Making the existing circuit work might be the easiest if the output of the unit and the locks both work properly. Testing the lock circuit and unit lock output with a test light or multimeter is the correct next step.

Lectric Guy

j.w.

Member - Posts: 42

Joined: February 02, 2005

Location: United States

Posted: April 27, 2010 at 12:24 PM / IP Logged

that's correct. it was installed that way, so i have no idea why there are two relays, but i'm willing to try whatever setup it takes to get it to work.

Ok, so i picked up a DMM today and did a bit of testing. Here's what i found...

LOCK TEST(tested by probing the wire right before pin 86 of the lock relay)

Resting = 9.21

Press Lock = 11.9

Press Unlock = 11.5

even though the unlocking is working fine, i decided to test that too...

UNLOCK TEST (tested by probing the wire right before pin 30 of the unlock relay)

Resting = 10.99

Press Lock = 10.93

Press Unlock = 0

now, what does this mean? :)

Thanks guys. Let me know if you need me to test anything else to help troubleshoot.

lectricguy

Copper - Posts: 359

Joined: March 18, 2008

Location: Rhode Island, United States

Posted: April 27, 2010 at 4:28 PM / IP Logged

Confirm that there is +12V constant on pin 85.

On pin 86, which comes from the remote start lock output, should be pulsing to ground for 1 second when lock is pressed. When this occurs, the relay will open pins 30 & 87a, which are closed (connected) when the relay is at rest.

Lectric Guy

j.w.

Member - Posts: 42

Joined: February 02, 2005

Location: United States

Posted: April 27, 2010 at 4:37 PM / IP Logged

will do. thx man. sorry, what does "pulsing to ground" mean?

lectricguy

Copper - Posts: 359

Joined: March 18, 2008

Location: Rhode Island, United States

Posted: April 27, 2010 at 4:43 PM / IP Logged

The output provides a 1 second momentary ground. Put the positive meter lead on 12V, the negative meter lead on pin 86. The meter will read 12V when the lock button is pressed if the output is working correctly.

Lectric Guy

j.w.

Member - Posts: 42

Joined: February 02, 2005

Location: United States

Posted: April 27, 2010 at 5:59 PM / IP Logged

Ok, just tested as you described. It reads 3.5v at rest, and when I press the lock buttononthe remote it reads 0.6v for a second 0r two. Any idea what could be causing that? Also, I confirmed that pin 85 reads 12v constant. I put the negative lead on a bare piece of metal on the body for ground.

j.w.

Member - Posts: 42

Joined: February 02, 2005

Location: United States

Posted: April 27, 2010 at 6:15 PM / IP Logged

I put the original relay back in place and getting different numbers - 12v at rest and 4v when I press the lock button. When I press unlock, it drops to 1v.

j.w.

Member - Posts: 42

Joined: February 02, 2005

Location: United States

Posted: April 27, 2010 at 6:20 PM / IP Logged

Not sure if this matters, but when I put positive on 12v (85) and negative on 30, it reads 12v at rest, and 11.8 when I press the lock button. Same with pin 87a.

j.w.

Member - Posts: 42

Joined: February 02, 2005

Location: United States

Posted: April 30, 2010 at 12:06 AM / IP Logged

i took some more readings. no idea what they mean, but having fun doing it. :) Maybe these numbers will help troubleshoot. Thanks!

AT REST: 85---87 = 0 volts

AT REST: 85---87a = 12

AT REST: 85---86 = 12

AT REST: 85---30 = 12

AT REST: 86---87 = 0

AT REST: 86---87a = 0.16

AT REST: 86---30 = 0.16

AT REST: 87a---87 = 0

AT REST: 87a---30 = 0

PRESS LOCK: 85---87 = 0 volts

PRESS LOCK: 85---87a = 12

PRESS LOCK: 85---86 = 4

PRESS LOCK: 85---30 = 12

PRESS LOCK: 86---87 = 0

PRESS LOCK: 86---87a = 8

PRESS LOCK: 86---30 = 8

PRESS LOCK: 87a---87 = 0

PRESS LOCK: 87a---30 = 0

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: April 30, 2010 at 12:34 AM / IP Logged

Frankly not a thing, hence use a test light or by-pass the lock side relay!

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