H3 Dash and radio are not working help!!

[Sneakysilver]

Ok so turned on the hummer and notice my radio and dash are not working, tried reading the fuse panel but having hard time with it. Found RDO assuming its for radio and fuse is fine. But can't find anything for dash, hvac controls are working 12 volts at the cig outlets. Please help thanks!

 

[Sneakysilver]

Also my hvac controls would blink idl if that helps, I can drive but can't see what gear or my odometer

 

[f5moab]

RDO fuse does power the radio and I believe the cluster lights, but some features of the cluster are powered through the CLSTR fuse (I believe 19).

When you say you checked the fuse; how? If by sight, you might want to swap out the fuse with a known good one just be sure or check with a multi-meter.

The flashing lights make it sound like a bad battery cable connection at the battery.

 

[Sneakysilver]

Multi meter I never trust my eyes, and did notice my thermals are loose, when I ran my cable for my winch in the rear. I'll put new ones on tmrw and try it

 

[HIROLA]

I had that issue once for about 15 min. Just an odd thing really. I started the truck, no dash power, freaked out for a little bit, then said screw it and started to drive home. 15 min into the drive, everything just turned back on and haven't had any issues since.

 

[SuperBuickGuy]

The HVAC controls flash when they come back on after losing power (complete power loss)...

 

[ArtHummer]

It is got to be the battery terminal. The factory ones suck big time. I would advise to replace it with more durable clamps.

 

[Sneakysilver]

It is got to be the battery terminal. The factory ones suck big time. I would advise to replace it with more durable clamps.

Just gotta get home from work to put them on and then I'll let y'all know! I hope that is all it is!

 

[Sneakysilver]

Ok put new terminals on and dash is on but still no radio

 

[alrock]

After the last time my battery died, it took allowing the battery to recharge plus another restart of the truck to get the battery to work properly. Are there any lights on the radio?

As for the HVAC control lights, whenever the battery is disconnected and reconnected it goes through the calibration process. This is normal and you should leave it alone until the lights stop flashing. The fact that you are seeing this (and usually you can hear the fan as well as the opening and closing of the vent doors) shows that you had a bad connection.

Might be worthwhile to have the battery tested too to make sure the right voltage is available.

 

[Sneakysilver]

Well taking it up to beat buy tmrw to look at the radio since they installed it and have life time warranty. They said it is prolly the module that goes into the radio

 

[Sneakysilver]

Alright it was the Onstar module for the aftermarket radio was bad, popped a new one in and good to go!