So we tackled a new head unit install. Everything was working fine during the install process. While finishing up, the battery died from doors being opened. Now, the 4x4 won't come out of 4L (4H light just blinks and never changes), the traction control states off, and we have zero power to the factory radio harness. I have checked fuse (location 13 under hood and is this the only fuse location?) and on the car and on the head unit as well. The manual states fuse at location 13 is for radio and ac controls which ac controls work fine. I've installed many new head units over the years. I always triple check my connections, use solder and make sure my connections are shielded very well. I have also connected the factory radio back into the factory harness with same result no power from factory harness. I took the new head unit out, connected it directly to power and it powers on so I know it isn't the new unit. Really scratching my head on this one. Any help is appreciated.

 

2006 H3 So we tackled a new head unit install. Everything was working fine during the install process. While finishing up, the battery died from doors being opened. Now, the 4x4 won't come out of 4L (4H light just blinks and never changes), the traction control states off, and we have zero power to the factory radio harness. I have checked fuse (location 13 under hood and is this the only fuse location?) and on the car and on the head unit as well. The manual states fuse at location 13 is for radio and ac controls which ac controls work fine. I've installed many new head units over the years. I always triple check my connections, use solder and make sure my connections are shielded very well. I have also connected the factory radio back into the factory harness with same result no power from factory harness. I took the new head unit out, connected it directly to power and it powers on so I know it isn't the new unit. Really scratching my head on this one. Any help is appreciated.

 

For the 4x4 its probably just stuck. Happens often. Put it in neutral and roll it forward or backward under 3mph and press the 4hi lock button. Once its in 4hi lock drive forward or backwards and press 4hi open. To avoid this in the future, if you dont use 4wd often, every couple of months, cycle between 4hi and 4hilock 20-30 times while sitting still and a few times from 4lo to 4hi lock. Also make sure you don't go straight from 4hi open to 4lo. or 4lo to 4hi open. Transfer Cases can be finicky.

For the radio. Check the instrument panel fuse box. Not sure of the location in the h3 but in the h2 I know its on the drivers side of the dash between the dash and the door panel when the door is open.

Have you tried Jump starting the vehicle? All of this could be from low voltage.

 

Or attempting to continue to use OEM Battery Terminal Connectors, which are complete garbage and have a near 100% failure rate.

Double check all the connection made to the center console facia T Case switches. Can't help with your head unit, you never mentions which or if you used an adapter.

 

Check what kind of power is missing (plus or ground). Take a long wire and test it near the battery.
As mentioned above, there may be a bad battery connection. But also check all the connections on the body (ground). Hammer suffers from this often((

 

If you have a aftermarket head unit make sure you installed the proper harness as well and if you have onstar you will need the interface for the radio, without it it will drain as well. Happened to me.