C4 General Discussion General C4 Corvette Discussion not covered in Tech

Unknown components

Thread Tools
 
Search this Thread
 
Old Feb 7, 2017 | 05:48 PM
  #1  
DAVECAD2.0's Avatar
DAVECAD2.0
Thread Starter
Instructor
10 Year Member
 
Joined: Feb 2007
Posts: 132
Likes: 3
From: CRYSTAL RIVER FL.
Default Unknown components

'92 LT1 coupe.
While replacing the interior plastic trim panel at the rear glass hatch I noticed two electric components. They were covered with a super sticky black tape. I peeled the tape off and one of the components is a battery. The other one has no markings at all. They are located next to each other to the right of the hatch release and wired together. About 4" x 2" x 2".
They are not part of the antenna. The wires are buried in the wire loom and I could not trace them. I have the factory service manuals but they don't have wiring diagrams.
Don't know how to post pics.
Any ideas?
Reply
Old Feb 7, 2017 | 05:50 PM
  #2  
DAVECAD2.0's Avatar
DAVECAD2.0
Thread Starter
Instructor
10 Year Member
 
Joined: Feb 2007
Posts: 132
Likes: 3
From: CRYSTAL RIVER FL.
Default

Sorry left of the hatch release.
Reply
Old Feb 7, 2017 | 07:33 PM
  #3  
WVZR-1's Avatar
WVZR-1
Team Owner
20 Year Member
Veteran: Army
Active Streak: 30 Days
Liked
 
Joined: Sep 2003
Posts: 25,384
Likes: 2,736
Default

I'm quite sure you've stumbled upon the DIODE MODULE that actually controls cargo lamps when ONLY the rear hatch is open. I thought I had an image from a later year but I can't put my hands on it.

Look in the FSM 8A-114-10 for a description I believe and check your wire colors using 8A-82-3. If that checks out post back. If it doesn't post back the wire colors!! You said left but I'm quite sure all years was "right" like in this '94 image.

Name:  Rear Diode Module.jpg
Views: 901
Size:  107.4 KB

Last edited by WVZR-1; Feb 7, 2017 at 07:40 PM.
Reply
Old Feb 8, 2017 | 10:48 AM
  #4  
DAVECAD2.0's Avatar
DAVECAD2.0
Thread Starter
Instructor
10 Year Member
 
Joined: Feb 2007
Posts: 132
Likes: 3
From: CRYSTAL RIVER FL.
Default

Originally Posted by WVZR-1
I'm quite sure you've stumbled upon the DIODE MODULE that actually controls cargo lamps when ONLY the rear hatch is open. I thought I had an image from a later year but I can't put my hands on it.

Look in the FSM 8A-114-10 for a description I believe and check your wire colors using 8A-82-3. If that checks out post back. If it doesn't post back the wire colors!! You said left but I'm quite sure all years was "right" like in this '94 image.

Attachment 48061394
WV:
Thanks for the very detailed response. The diode you mentioned is in fact on the right side. However, these components are (were) on the left side.
It seems I'm dealing with some legacy components that no longer function. i.e. car alarm, remote hatch popper, etc.
I removed them and found they are no longer connected to the cars electrical system.
The 12V sealed battery feeds what I believe is a transmitter of some kind. The only output is a single "antenna" wire. I say antenna wire because it has a car antenna connector where it plugs in the unknown box. The only markings on the box are on a bar code label on the bottom.
5RLJ5603 15392
002D8BB
FCC I.D. IDILJU-01
Googled, no results.
I checked the battery with a DOM and it's dead.

Thanks again.
Reply
Old Feb 8, 2017 | 11:08 AM
  #5  
WVZR-1's Avatar
WVZR-1
Team Owner
20 Year Member
Veteran: Army
Active Streak: 30 Days
Liked
 
Joined: Sep 2003
Posts: 25,384
Likes: 2,736
Default

Originally Posted by DAVECAD2.0
WV:
Thanks for the very detailed response. The diode you mentioned is in fact on the right side. However, these components are (were) on the left side.
It seems I'm dealing with some legacy components that no longer function. i.e. car alarm, remote hatch popper, etc.
I removed them and found they are no longer connected to the cars electrical system.
The 12V sealed battery feeds what I believe is a transmitter of some kind. The only output is a single "antenna" wire. I say antenna wire because it has a car antenna connector where it plugs in the unknown box. The only markings on the box are on a bar code label on the bottom.
5RLJ5603 15392
002D8BB
FCC I.D. IDILJU-01
Googled, no results.
I checked the battery with a DOM and it's dead.

Thanks again.
Are you sure it's maybe not a LoJack install from the past?

https://fccid.io/IDILJU-01

Look for a LoJack installer in the vicinity and do a drive by for confirmation. LoJack of course never published installation instuctions to the "PUBLIC" as it would have very likely defeated the purpose of the buy and install.

***I'd think this likely and when traded/sold the LoJack removed for refund/resale or moved to the next purchase. There would be no reason to move the components that you mentioned finding.

Last edited by WVZR-1; Feb 8, 2017 at 12:07 PM.
Reply
Old Feb 8, 2017 | 01:33 PM
  #6  
DAVECAD2.0's Avatar
DAVECAD2.0
Thread Starter
Instructor
10 Year Member
 
Joined: Feb 2007
Posts: 132
Likes: 3
From: CRYSTAL RIVER FL.
Default

Originally Posted by WVZR-1
Are you sure it's maybe not a LoJack install from the past?

https://fccid.io/IDILJU-01

Look for a LoJack installer in the vicinity and do a drive by for confirmation. LoJack of course never published installation instuctions to the "PUBLIC" as it would have very likely defeated the purpose of the buy and install.

***I'd think this likely and when traded/sold the LoJack removed for refund/resale or moved to the next purchase. There would be no reason to move the components that you mentioned finding.
You know I thought about that after I sent the reply. Then I thought its odd that the battery doesn't receive a maintenance charge from the car. The way they wired it one would need to periodically replace the battery?

Thanks for the additional info.
Reply
Old Feb 8, 2017 | 01:45 PM
  #7  
WVZR-1's Avatar
WVZR-1
Team Owner
20 Year Member
Veteran: Army
Active Streak: 30 Days
Liked
 
Joined: Sep 2003
Posts: 25,384
Likes: 2,736
Default

Originally Posted by DAVECAD2.0
You know I thought about that after I sent the reply. Then I thought its odd that the battery doesn't receive a maintenance charge from the car. The way they wired it one would need to periodically replace the battery?

Thanks for the additional info.
I wouldn't think so. If it was early it's likely just a Lithium and wouldn't be rechargeable. If rechargeable it would need to be Lithium-Ion (I think that's right). Is it a little larger than a AA or what. LoJack I'm sure had maybe a 3 - 5 year replacement recommendation.

There's LoJack battery packs on eBay I'm sure. Maybe poke around there and see what you find.

Like I mentioned "visit an installer"!!
Reply
Old Feb 8, 2017 | 03:44 PM
  #8  
DAVECAD2.0's Avatar
DAVECAD2.0
Thread Starter
Instructor
10 Year Member
 
Joined: Feb 2007
Posts: 132
Likes: 3
From: CRYSTAL RIVER FL.
Default

Originally Posted by WVZR-1
I wouldn't think so. If it was early it's likely just a Lithium and wouldn't be rechargeable. If rechargeable it would need to be Lithium-Ion (I think that's right). Is it a little larger than a AA or what. LoJack I'm sure had maybe a 3 - 5 year replacement recommendation.

There's LoJack battery packs on eBay I'm sure. Maybe poke around there and see what you find.

Like I mentioned "visit an installer"!!
No dealers or service in my area. Car originally bought in Miami. So that makes sense. I live mid-state on west coast. Fla.
The battery is the type like used in home alarm systems. 4" x 2" x 2".
Yuasa 9205101.

Talked to LoJack. You buy their system, they install. No annual service fees. But, one this old they won't transfer. Would need to update. Not worth it for me. Their still just stealing bicycles in my hood.

Thanks again.

Dave.
Reply

Get notified of new replies

To Unknown components

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-1

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-2

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-3

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-4

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-5

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-8

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-9

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer




All times are GMT -4. The time now is 05:57 PM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE