Problem w/ High Lock?

[JetEyeNite]

I guess I need to call my dealer
thanks for your input Paragon...

[f5fstop]

Sounds to me like a transmission shift control module. Are you moving fast when it happens?

[JetEyeNite]

No, I wasn't moving fast at all. This morning, I noticed it when I was backing out from my drive way. Also, I noticed this when I was leaving from the office parking lot yesterday afternoon.
I hope nothing major needs replacing.....

[ttkresurfacing]

Had the dealership look at mine for same problem today and they think it has something do with wiring coming from key switch. The ychanged my key switch 10 months ago and broke the retainer clip off the harness. Now if I raise the steering wheel, the truck cuts off. They said that the harness was causing the trans light also. Told me 500 to fix it.

Tim

[Linus Gump]

Originally Posted by ttkresurfacing

Had the dealership look at mine for same problem today and they think it has something do with wiring coming from key switch. The ychanged my key switch 10 months ago and broke the retainer clip off the harness. Now if I raise the steering wheel, the truck cuts off. They said that the harness was causing the trans light also. Told me 500 to fix it.

Tim

Why should you have to pay for a damage they caused in fixing something else?

[PARAGON]

Originally Posted by f5fstop

Sounds to me like a transmission shift control module. Are you moving fast when it happens?

I am sure the H3 and H2 are very similar but I don't follow where the transmission shift control module would be the culprit.

The transmission has to be in neutral and speed virtually zero and then you push 4HI and 4LO together for the t-case to go to Neutral.

I haven't looked it up, but it would seem that the BCM would have to recognize that the tranny is in neutral itself before it would allow for the shift to neutral in the t-case to occur.

Nite, is it just a light coming on or does it physically go into neutral.... meaning you have no more power to the wheels.

[PARAGON]

Why does the title of the thread say HI lock if you are backing out of your driveway and coming home from work?

[JetEyeNite]

Paragon,
You are correct.. The title of the thread is incorrect. It should say "Problem with 4 High" or "Problem w/ 4 High light indicator"

This was 3rd time I've seen this. The light indicator was on "N" instead of normal 4 High. So, I press the 4 High button and it blinks for a few seconds and goes into 4 High. I don't remember not having any power.

[PARAGON]

The transfer case shift control module flashes each indicator lamp after a shift has been requested and continues to flash until the transfer case shift control module can complete the shift. If the transfer case is unable to make a shift, the requested mode indicator flashes and returns to the previous mode. If the requested mode indicator flashes for 15 seconds and returns to the previous mode, this indicates the loss of a necessary input from another module. The transfer case shift control module requires a vehicle speed sensor signal (VSS), provided by the ABS module, and a PRNDL input provided by the transmission. These signals are provided to the transfer case shift control module via class 2, and if not received the transfer case will not shift.

Also, a bad ground or connection in the tcase switch can cause the light to light-up.

Check to see if it shifts in and out of 4HI lock, 4LO, Neutral and 4HI without hiccups.

[f5fstop]

Originally Posted by PARAGON

I am sure the H3 and H2 are very similar but I don't follow where the transmission shift control module would be the culprit.

The transmission has to be in neutral and speed virtually zero and then you push 4HI and 4LO together for the t-case to go to Neutral.

I haven't looked it up, but it would seem that the BCM would have to recognize that the tranny is in neutral itself before it would allow for the shift to neutral in the t-case to occur.

Nite, is it just a light coming on or does it physically go into neutral.... meaning you have no more power to the wheels.

A failed T/case controller controls the encoder motor that engages all the different 4-wheel drive systems on the vehicle. So, if there was a major failure and it did not correctly process the information from the inputs, including the BCM via the class 2 circuit, it could attempt to engage.
It could just change the indicators too without engaging or disengaging.
I'm not saying it is the problem, all I'm saying is it could be a problem, and for a fact, a well-known problem!

[PARAGON]

Originally Posted by f5fstop

A failed T/case controller controls the encoder motor that engages all the different 4-wheel drive systems on the vehicle. So, if there was a major failure and it did not correctly process the information from the inputs, including the BCM via the class 2 circuit, it could attempt to engage.
It could just change the indicators too without engaging or disengaging.
I'm not saying it is the problem, all I'm saying is it could be a problem, and for a fact, a well-known problem!

Sorry, you mentioned transmission controller originally when I think you meant T-case. That's where I was confused.

I'm betting he's just getting that change of indicator lights and not actual switching in the t-case itself.

[f5fstop]

Originally Posted by PARAGON

Sorry, you mentioned transmission controller originally when I think you meant T-case. That's where I was confused.

I'm betting he's just getting that change of indicator lights and not actual switching in the t-case itself.

Oops, I did (been a bad couple weeks). I also agree, it is probably the changing of the lights, since if the t/case controller did attempt to switch into 4-low while moving and not in neutral, there should be some serious noise from under the vehicle.

[JetEyeNite]

I tried to switch from 4H to 4H lock and then switched to N.
I tried to go into 4L lock and it all worked fine.
I know I didn't hit 4H lock nor 4L lock when I noticed this problem.

So, you guys are saying that I shouldn't worry about this since it is just the indicator light?