post #1 of Old 09-11-2012, 04:47 PM Thread Starter
BIRICON
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2003 TJ Wrangler 
 
Join Date: Jun 2012
Location: San Antonio
Posts: 14
4WD Light

I have an 03 Rubicon with a std transmission, 70k miles. When driving in 2WD, the 4WD indicator light in my dash is ON. When I engage the transfer case and am actually in 4H the light goes OFF. If I go to 4L the dash light comes back ON. I have been told that the Rubicon is wired differently from other models. Any idea how this got wacked out and what to fix to get it right again?

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post #2 of Old 09-14-2012, 12:58 PM Thread Starter
BIRICON
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2003 TJ Wrangler 
 
Join Date: Jun 2012
Location: San Antonio
Posts: 14
A guy with an 07 Wrangler told me the 4WD dash light would need an ECM replacement to fix. Can this be right????? I figured some sensor on my 03 Rubicon had gone bad. Anybody have any ideas?
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post #3 of Old 09-15-2012, 09:50 PM
mukluk
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde
Posts: 1,887
Your Rubicon uses a variable resistance switch for the transfer case shifter position, the PCM interprets the resistance within certain ranges to determine what mode the t-case is in. The sensor is installed on top of the t-case, above the t-case shifter arm. Check the resistance of the switch in each shift range to verify the switch hasn't gone bad.

2Hi - 1124 to 1243 ohms
4Hi - 650 to 719 ohms
N - 389 to 431 ohms
4Lo - 199 to 221 ohms
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post #4 of Old 09-15-2012, 09:53 PM
mukluk
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Join Date: Oct 2010
Location: Clyde
Posts: 1,887
You can see the switch and wire harness below and to the right of the arrow in the pic.
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