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  #1  
Old 08-04-2016, 06:16 AM
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Lights on Dash

I have 3 different lights that have been on my dash for a while now. Took my Liberty to the dealer and they told me what I kind of already knew that they lead to my BCM needing to be replaced. The lights that are on are my ABS, Brake and traction control. My speedometer does not move while I drive it just sits at zero. Can anyone tell me where and how difficult it is to change myself instead of paying an arm, leg, and 3 toes at the dealer or neighborhood mechanic?

I greatly appreciate it. Thanks in advance

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Old 01-13-2017, 05:32 AM
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Re: Lights on Dash

Hi,

According to the 2002 - 2007 Liberty Service Manual the ABS sensors are also part of the system that measures wheel speed. :
"Vehicle Speed System - ABS Equipped - The
CAB provides 12VDC hard wire speed sensor supply
to the Left and Right Wheel speed sensors and the
Rear Wheel Speed Sensor the speed sensor output
hard wire square wave signals back to the CAB. the
CAB outputs a hard wire square wave back to the
BCM. The BCM calculates vehicle speed based upon
a programmed Tire revolutions per mile (TIRE REV/
MILE) value. This calculation is based upon tire circumference
revolutions per mile. This calculation
must be programmed into the BCM. New service
BCM’s are shipped in default mode that prevents
speedometer indication until a valid tire size is programmed.
The BCM outputs a hard wired square
wave Vehicle Speed Output signal to the PCM. The
PCM transmits vehicle speed to the instrument cluster
via the PCI bus."
You should get this checked and replaced if needed.
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