No reverse lights and no gauges

Tiny
JIM REESE
  • MEMBER
  • 2005 CHEVROLET EXPRESS
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 230,000 MILES
I watched gauge cluster blink on/off then finally off. Engine/transmission working okay. I located leaking oil pressure sensor, adjacent sensor wiring soaked in oil. Can’t find a blown fuse.
Inspection overdue!
Monday, August 3rd, 2020 AT 3:05 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,427 POSTS
Hi,

It sounds like you have a couple different problems. The first thing I want you to check is fuse 18 in the under hood fuse box. In addition to just checking the fuse, confirm there is power to it. Here is a link that will help:

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

Next, in the attached pic, I highlighted the light green wires that power the back up lights. If the fuse is good, I need you to check if power is going to the lights. If there is, then check the two grounds I highlighted. You can simply check for continuity to ground via the black wires at the light socket.

If you look at pic 2 below, I highlighted two fuses. Fuse 18 is the one I mentioned above. Fuse 31 is for the instrument panel. Check both and confirm power is available.

Let me know what you find.

Joe
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Monday, August 3rd, 2020 AT 10:05 PM
Tiny
JIM REESE
  • MEMBER
  • 9 POSTS
Okay Joe, both fuses look okay and are powered with 13V
Reverse engaged, 11V between green and chassis, nothing between green and black.
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Tuesday, August 4th, 2020 AT 3:03 PM
Tiny
JIM REESE
  • MEMBER
  • 9 POSTS
I do have continuity to ground at black wire.
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Tuesday, August 4th, 2020 AT 3:17 PM
Tiny
JIM REESE
  • MEMBER
  • 9 POSTS
Thanks.
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Tuesday, August 4th, 2020 AT 3:17 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,427 POSTS
Hi,

If you are connecting your multi meter between the green and black and there is no reading, then you have no ground. That is the problem.

Just for the heck of it, take a wire and splice it into the black wire and connect it to a known ground and see if it turns on.

Let me know.

Joe
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Tuesday, August 4th, 2020 AT 10:21 PM
Tiny
JIM REESE
  • MEMBER
  • 9 POSTS
I’m getting test light for better diagnostic. Also taillight fuses had blown due to careless cramming, I think wires were pinched. Working now. BCM chatters intermittently.
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Friday, August 7th, 2020 AT 6:33 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,427 POSTS
Hi,

The lights are working at this point?

Let me know.
Joe
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Friday, August 7th, 2020 AT 10:59 PM
Tiny
JIM REESE
  • MEMBER
  • 9 POSTS
No reverse lights yet.
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Saturday, August 8th, 2020 AT 12:06 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,427 POSTS
Okay, lets get them working as well. I attached the entire wiring schematic for the back up lights. I circled the fuse to check. Make sure there is power in and out. If there is, go to the rear lights and check the light green wires for power. Check both sides. Note there is a splice in the wiring, so if there is now power, we will need to check for power out at the body control module.

Do this and let me know the results.

Joe
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Saturday, August 8th, 2020 AT 9:25 PM
Tiny
JIM REESE
  • MEMBER
  • 9 POSTS
Okay Joe, I did better checking and located wire group entering BCM, power going in, nothing coming out on green wires. Does signal come from transmission switch or column?
PS, thanks for your patience, my right arm is in a cast.
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Wednesday, August 12th, 2020 AT 2:19 PM
Tiny
JIM REESE
  • MEMBER
  • 9 POSTS
Okay, I found the connector under the brake booster, will check switch connection tomorrow. Transmission was replaced 3 years ago, switch maybe as well.
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Wednesday, August 12th, 2020 AT 2:42 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,427 POSTS
Hi,

Sorry to hear about the arm. I'm sure that doesn't make things easy to work on. Let me know what you find.

Joe
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Wednesday, August 12th, 2020 AT 9:44 PM

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