Jump to content

Modifying or disabling auto-dim mirror feature?

Jim-K

By Jim-K
in Ask A GM Technician

Recommended Posts

Jim-K Enthusiast

Jim-K

Posted
Posted

'04 GMC Sierra 2500HD. I have the auto-dimming rear and driver side mirrors. In some cases they dim too much. I recently drove thru Atlanta on I-75 after dark and the mirrors got so dim all I could see were spots of light in a dark blue background. I couldn't even make out shapes so I didn't know whether those spots were cars, trucks, or two motorcycles. It made it very difficult and, therefore, unsafe to change lanes. Is there any way to limit how much it dims the mirrors? I'd still like to be able to see the general outlines of the vehicles, lane markers, etc.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

There's no adjustment but it can be turned off. Look in your owner's manual as I don't recall the exact button to press on the mirror to do this.

pwall Senior Enthusiast

pwall

Posted
Posted

I wish there was a way to turn it on....I find that sometimes the mirrors don't dim when I wish they would. :chevy:

Jim-K Enthusiast

Jim-K

Posted
  • Author
Posted
There's no adjustment but it can be turned off.  Look in your owner's manual as I don't recall the exact button to press on the mirror to do this.

 

 

 

 

I checked the owner's manual - couldn't find a thing except a brief paragraph that said the mirrors automatically dimmed. That's why I posted here.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
I checked the owner's manual - couldn't find a thing except a brief paragraph that said the mirrors automatically dimmed.  That's why I posted here.

 

 

 

 

 

The following is from an '04 Sierra owner's manual. It covers turning off the auto-dimming as I mentioned...

 

-------------------------------------------------

 

Automatic Dimming Mirror Operation

 

The automatic dimming mirror function is turned on automatically each time the ignition is started. To operate the automatic dimming mirror, do the following:

 

Make sure the green indicator light, located to the left of the on/off button, is lit. If it's not, press and hold the on/off button for approximately six seconds until the green light comes on, indicating that the mirror is in automatic dimming mode.

 

Turn off the automatic dimming mirror function by pressing and holding the on/off button for approximately six seconds, until the green indicator light turns off.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • richard wysong
      Electrical Problem - solved

      By richard wysong · Posted

      Thanks for posting, I'm sure it will help someone
    • Brendan C
      2026 6.6 L5P oil cooler leaking oil at 4,000 miles

      By Brendan C · Posted

      New to diesel trucks. I happened to find my oil cooler leaking oil externally with only 4,000 miles on the truck. I didn’t realize this was an issue until I started researching it. Dealer is going to replace it under warranty but I’m wondering if there’s anything GM is working on to fix this issue. I’ve heard the oil filter used is the same as they use on their V6 motors and that’s what is causing the problems. Should I switch to a bigger filter or keep using the OEM recommended? 
    • Vu1can
      Seems to be Missing a lot of Updates

      By Vu1can · Posted

      So, GMCustomerService:  Judging by the Update History pictured above, is this truck missing any updates that it actually needs. If it's just for the infotainment system, the radio is working fine and no trouble with SeriusXM. and Android Auto is working fine wirelessly with my phone. Some months ago, an update notice was sent to my truck. I approved the update and it finished saying that the update was successful, but it seems that whatever that update was, it didn't actually get installed - at least not if I'm to go by the Update History shown above.   So, again, are there any updates that this truck really should have? I've checked with my dealer but they're reluctant or commit to anything and if I want them to check, they require a $200.00 fee just to check it out and then I'd have to pay for the actual update(s).    Ignorance is bliss, and if none of the updates goes to fixing any mechanical discrepancies, I'll just leave things as is.  
    • CNH-320
      Electrical Problem - solved

      By CNH-320 · Posted

      Hey everyone, I recently had an issue with my 07 2500HD GMT900. My DRL’s stay on at all times. Right front turn and right mirror turn signal indicator stay on solid at all times. By “at all times” I mean the only way to make them go off is disconnecting the battery. I tore the headlight assemblies out, tried disconnecting the harnesses to eliminate bad wiring at the harness, I unplugged the headlight switch, no change and the mirror turn signal still stayed on. My first thoughts were : Bad bulb and/or socket somewhere, under hood fuse panel bad, bcm bad, tail light or trailer wiring problem, or some random short to power in the harness.  Possibly a bad ground but unlikely. I had a big clue in the fuse panel, it had a burnt smell. I started pulling every fuse that had to do with DRL or right turn/park lamp. Nothing made the right directional turn off but pulling the DRL2 fuse made the DRL’s go out.  After studying wiring diagrams, I found that both problems had that fuse panel in common, the bcm also controls both problems but knowing the fuse panel had a burnt smell I removed and disassembled the fuse panel and found a little corrosion on the printed circuit board.  I ordered a new fuse panel from Amazon for like $260. When it arrived I installed it, and put everything back together, the problem was fixed. I figured the fuse panel needed to be replaced anyway so that was a logical place to start. Hopefully this story helps someone in the future. Regretfully I didn’t scan for codes before I did everything.
    • 2022LtTbZ71
      Service 4wd, ESC light, traction control light on, Service charging system (vehicle may stall)

      By 2022LtTbZ71 · Posted

      That stinks. I’m sitting on the side of the road right now with the same issue. Never had an issue before taking it in for the ground strap recall. Now I’m outside of warranty and they’ll probably want $200 just to diagnose what they already “fixed”. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...