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Reverse lights in towing mirror


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I have a 2017 gmc Denali 2500HD with the reverse lights in the mirrors, they will not come on.  The reverse lights in the tail lights work, is there a separate fuse for the mirror lights?  Is there something special that I need to turn on to make these work?

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^^^

The cargo light button needs to be on.

 

Press the switch to turn the cargo
lamp on or off. An indicator light will
turn on when the lamp is turned on,
if equipped. The shift lever must be
in P (Park) to operate the cargo
lamp. The lights on the outside
rearview mirrors turn on if the shift
lever is in R (Reverse), N (Neutral),
or P (Park).

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3 hours ago, redwngr said:

^^^

The cargo light button needs to be on.

 

Press the switch to turn the cargo
lamp on or off. An indicator light will
turn on when the lamp is turned on,
if equipped. The shift lever must be
in P (Park) to operate the cargo
lamp. The lights on the outside
rearview mirrors turn on if the shift
lever is in R (Reverse), N (Neutral),
or P (Park).

Yup, thats how they work. ;)

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^^^
The cargo light button needs to be on.
 
Press the switch to turn the cargo
lamp on or off. An indicator light will
turn on when the lamp is turned on,
if equipped. The shift lever must be
in P (Park) to operate the cargo
lamp. The lights on the outside
rearview mirrors turn on if the shift
lever is in R (Reverse), N (Neutral),
or P (Park).


The problem is they will stay on even after you lock the doors and go inside..have a beer. Watch the game, go to bed...wake up in the middle of the night to let the dog out...and look outside and see that they are still on.


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1 hour ago, Waaazooo said:

 


The problem is they will stay on even after you lock the doors and go inside..have a beer. Watch the game, go to bed...wake up in the middle of the night to let the dog out...and look outside and see that they are still on.


Sent from my iPhone using Tapatalk

 

Supposed to shut off after 20 minutes.

 

2018 sierra manual:

 

Battery Power Protection
This feature shuts off the dome and reading lamps, if they are left on for more than 10 minutes after the ignition is turned off.

The cargo lamp shuts off after 20 minutes. This prevents the battery from running down.

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Supposed to shut off after 20 minutes.
 
2018 sierra manual:
 
Battery Power Protection
This feature shuts off the dome and reading lamps, if they are left on for more than 10 minutes after the ignition is turned off.
The cargo lamp shuts off after 20 minutes. This prevents the battery from running down.

Looks like I’m going back to the dealer, mine were on after 5-6 hours


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1 hour ago, Waaazooo said:

Thanks for the pic!!! Does the direction of the diode matter?


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Yes!

 

(a diode acts like a one-way valve)

Edited by redwngr
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Thread got my curiosity up, so tried mine.

 

I was working near the truck so unlocked and pushed the cargo light button. 

Cargo light and led's in mirrors came on.

Locked truck and keys in pocket.

 

Checked occasionally to verify cargo and leds were on. 

After 20 minutes heard a relay click -- looked over and the lights were out.  

 

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  • 11 months later...
On 11/26/2017 at 5:14 AM, Black Denali Canada said:

Use a diode and have them come on automatically when shifted into reverse


I have my fogs come on with my parking lamps and Tow mirror reverse lights come on when shifted into reverse

7b5ea34be9f384857a70a5a405b2000b.jpg


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Super helpful picture. Thank you for posting. I was wondering how some folks handles the diodes. Thank you for demonstrating install and how you connected reverse lights as well. Thumbs UP! 

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