2004 trailblazer tach wire

Home / the12volt's Install Bay / Car Security and Convenience / 2004 trailblazer tach wire (

Topic Closed)

Welcome Guest :)

Members

< Prev Topic Next Topic >

jslayton

Member - Posts: 23

Joined: September 15, 2005

Location: United States

Posted: January 19, 2008 at 12:02 PM / IP Logged

I am installing a remote start on a 2004 Trailblazer and it says that pin 49 on the blue plug on the PCM is for the Tach, but pin 49 doesn't have a wire coming out of it??? Is this normal??

Also, the remote start that I am using has three wires for unlock and three wires for lock. The three wires are labeled 87, 87a, and 30. The GMDL-BP module that I have says that it needs a ground pulse for the unlock input and ground pulse for the lock input. If I read the relay diagram correctly, I should be able to connect the 30 from the lock and 30 from the unlock to the corresponding wire on the GMDL-BP, then ground the 87 wire on both the unlock and lock set and it should pulse ground, correct?

sparkie

Platinum - Posts: 2,061

Joined: November 06, 2003

Location: Canada

Posted: January 19, 2008 at 12:19 PM / IP Logged

You are correct for the door locks. There is only one white wire in the blue plug of the PCM. This is the tach wire. Do not use the WHITE/ black wire.

sparky

StealthEs

Copper - Posts: 326

Joined: September 04, 2003

Location: New Jersey, United States

Posted: January 19, 2008 at 12:20 PM / IP Logged

theres one of 2 tach wires for this car depending on the engine.

4.2L: The PCM is attached to the driver side of the engine. Tach is in the blue plug, pin 49. 5.3L: The PCM is near the lower front driver side of the engine. Tach is in the green plug, pin 10.

Cris

jslayton

Member - Posts: 23

Joined: September 15, 2005

Location: United States

Posted: January 19, 2008 at 12:27 PM / IP Logged

The pins are numbered on the back of the connector once and pin 49 has no wire. So I should just find the white wire?? Also, on this car, what can I use for the door trigger. The dome lights have a delay on them, so I don't think I can use that can I?

jslayton

Member - Posts: 23

Joined: September 15, 2005

Location: United States

Posted: January 19, 2008 at 12:29 PM / IP Logged

Nevermind, I was looking at the wrong pin, I found the tach wire, but still need to know about the door trigger.

KarTuneMan

Platinum - Posts: 7,056

This member has made a donation to the12volt.com. Click here for more info.

This member consistently provides reliable information

Joined: December 14, 2004

Location: Isle Of Man

Posted: January 19, 2008 at 12:58 PM / IP Logged

DOORPIN

SEE NOTES

You can use the GRAY/BLACK at the courtesy light under the dash or the light over the driver's side door to catch all doors and the rear hatch. The seperate doorpins are: GRAY/BLACK-driver's door (located in driver's door), BLACK/ WHITE-passenger door (located in passenger door), LT.BLUE/BLACK-left rear door, LT.GREEN/ BLACK-right rear door (both found at the fusebox under the rear seat on the driver's side. All wires are negative (-) polarity.

jslayton

Member - Posts: 23

Joined: September 15, 2005

Location: United States

Posted: January 19, 2008 at 1:08 PM / IP Logged

Thanks, two more questions. My alarm has two outputs for parking lights. Both output 12 volts. I was wondering if I could connect one of them to the hazard wire and then one to the headlight wire, or would I need to connect directly a parking light wire??

2nd question, do these cars come with a factory system? My mom said that she has opened the doors without unlocking them first and the horn started beeping, but she doesn't have a keychain module with it.

KarTuneMan

Platinum - Posts: 7,056

Joined: December 14, 2004

Location: Isle Of Man

Posted: January 19, 2008 at 1:18 PM / IP Logged

Parking lights are (POS)+ Brown under the steering column. Use just that one. Use the output thats stated for "parking light flash"

How do you open a door with out unlocking it? 2004 trailblazer tach wire -- posted image.

Your bypass should control the arming, and disarming of the factory security.

jslayton

Member - Posts: 23

Joined: September 15, 2005

Location: United States

Posted: January 19, 2008 at 2:04 PM / IP Logged

I don't see a courtesy light under the dash. Is it on the driver side or passenger??

tedmond

Gold - Posts: 4,610

This member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.

Joined: January 06, 2007

Location: Ontario, Canada

Posted: January 19, 2008 at 6:02 PM / IP Logged

1)Thanks, two more questions. My alarm has two outputs for parking lights. Both output 12 volts. I was wondering if I could connect one of them to the hazard wire and then one to the headlight wire, or would I need to connect directly a parking light wire??

the reason there might be 2 parking light outputs is because some cars have 2 independant flashers eg one controls front and other for rear or left.right.

2) 2nd question, do these cars come with a factory system? My mom said that she has opened the doors without unlocking them first and the horn started beeping, but she doesn't have a keychain module with it.

well gee, i wouldnt know how you open a door without unlocking...im just as confused kartuneman ! anyways, the only reason it would HONK is because the factory arm is still set and hasnt been disarmed. the car/factory alarm thinks some1 broke in and it will wail on you. as KTM mentioned, the GMDL-BP should be able to diarm/arm it for you.

Sorry, you can NOT post a reply.
This topic is closed.

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

2004 trailblazer tach wire

Sorry, you can NOT post a reply.This topic is closed.

Sorry, you can NOT post a reply.
This topic is closed.