Jeep Wrangler - AC Control Head issue

Damon Technician Florida Posted   Latest  
Resolved
Electrical
2010 Jeep Wrangler Rubicon 3.8L (1 EGT) 4-spd (42RLE) — 1J4BA6D16AL109567
B10C1
Ac Compressor Not Staying Engaged

I have this 2010 Jeep Wrangler and the AC compressor is not staying engaged. When the fan switch is turned on (manual ac) it will come on sometimes and when it does only for a few seconds. Sometimes it does not engage at all.

DTC's: B10C1 in the instrument cluster (AC select switch staying pressed for >20sec)

I can command the a/c clutch through the TIPM and it stays engaged.

When I turn the fan switch to the off position, the AC light will stay illuminated (compressor not engaged) for about 10 seconds, then goes out. (photo attached) On the a/c led control circuit I have 4v when the light is on and B+ voltage when the light is off.

In researching this code, I find that the cluster sends 5v to the control head on the MUX control circuit and the control head grounds the circuit to request A/C. When I unplug the control head I do have 4.69v. from the cluster. With the control head plugged in I have 0.76v (a/c switch off) and 3.73v (a/c switch on).

On the MUX return I have ground at all times, plugged in or not a/c on or off.

I have installed two dealer HVAC control heads with no change. What am I missing? Since I am receiving 5v from the cluster doesn't this prove the cluster good? I can control the compressor with the scanner through the TIPM, so doesn't it prove it good?

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Ronald Owner/Technician
California
Ronald
 

I think you have a bad instrument cluster on this one

+3
Ð Awarded
Agree
Matthew Diagnostician
Kentucky
Matthew
 

It doesn't prove the cluster is relaying the message to the tipm maybe check to see if the cluster is receiving the message and if so then the cluster is suspect

+1
Ð Awarded
Damon Technician
Florida
Damon
 

What message are you referring to and how do I test this?

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Ð Awarded
Matthew Diagnostician
Kentucky
Matthew
 

If the command is received via cluster it would be a command sent over the network to the pcm which i believe according to wiring diagram is what sends the final command to the tipm to engage the ac clutch relay and provide power to the clutch. So I would suggest. looking at all inputs for ac control in the chain of command from the instrument cluster to the pcm and if all look good and no other…

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Ð Awarded
Cody Diagnostician
Missouri
Cody
 

I've seen this issue befor on 2008 jeep, Replacing the cluster was the fix.

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Ð Awarded
Damon Technician
Florida
Damon Update
 

An instrument cluster has been ordered for this Jeep. I am told it is 5 days out. Will update or close this out after installation.

+1
Update Ð Awarded
Damon Technician
Florida
Damon Resolution
 

A used instrument cluster fixed the issue. Thank you all for the input. The only thing is that the mileage in the cluster is different from the original. Is there any way I can change this? I am guessing not.

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Resolution Ð Awarded