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Unread 02-25-2009, 12:37 PM   #1
plunderisley
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Compass TPMS - replacements, and how to install?

As I got winter tires I had the dealer change the sensors from the all year to the winter. Costed about 60USD. I'm thinking in the long run it might be cheaper to buy 4 extra sensors and use those. Can the system take 8 sensors? How does it sync with the onboard computer and how can I program it? What happens if I swap tires around?

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Unread 02-25-2009, 04:52 PM   #2
Gramps
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The sensors are "proximity" sensors. Programming is not required. You could run as may sensors as you want but I have heard of the computer picking up the tires in the garage but that clears up as soon as you drive away.
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MK Skid Plate fasteners for sale posts 68 & 69

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Unread 02-25-2009, 11:38 PM   #3
plunderisley
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So each sensor is not programmed to a certain side of the car? I can just swap them around and they should work?
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Unread 02-26-2009, 03:34 AM   #4
Gramps
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Correct.

DESCRIPTION
A transponder, sometimes referred to as a trigger module, is located in three of the four wheel wells (behind the wheelhouse splash shields) of a vehicle equipped with Premium TPM. These transponders are used to provide the Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM), with the location of the tire pressure sensors on the vehicle. A fourth transponder is not necessary in the remaining wheel well due to the process-of-elimination theory. Once the system knows the location of the first three sensors it assumes the location of the fourth tire pressure sensor. On this vehicle, there is a transponder located in the left front, left rear, and right rear wheelhouse. There is not a transponder located in the right front wheelhouse.


OPERATION
On vehicles equipped with the premium TPM system, the Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM), uses transponders (trigger modules) located in three of the four wheel wells on the vehicle to provide it with the location of the tire pressure sensors on the vehicle. Like the base system, the WCM receives RF signals from all four rotating wheel speed sensors. When the WCM needs to know which sensor is located at a particular location on the vehicle, it directs the transponder at that location to send out a low frequency signal to excite the nearby sensor. The WCM then receives that excited signal and knows where that sensor is located. This auto-locating process only happens in the first 10 minutes of any WCM cycle while traveling at speeds above 20 mph (32 km/h). (The auto-locating process will start again only if the vehicle has been shut off for approximately 20 minutes or longer). Once the WCM has performed this to the three locations that have transponders, it uses the process-of-elimination theory to know that the fourth sensor ID signal is coming from.
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MK Skid Plate fasteners for sale posts 68 & 69

Also visit me at Photobucket
'06 WK Grand Cherokee Limited Quadra-Drive II, 5.7
'07 MK Compass Limited 4X4, AutoStick
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Unread 03-08-2009, 06:50 AM   #5
plunderisley
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Do you happen to know the part number(s)?
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Unread 03-08-2009, 09:20 AM   #6
Gramps
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Free parts books are located in this sticky MK's Off-Road, TSB's, Parts Books and quick links in the 3rd post. They are considered electrical and listed in group 8 - figure 640, item 6 (second page), kit part number 68001696AA.

This kit is listed at Wyckoff for $36 each. I understand that they do ship International but you will want to check locally because of shipping. I'm pretty sure that their "Free Shipping" banner only applies to US.
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Bob

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MK Skid Plate fasteners for sale posts 68 & 69

Also visit me at Photobucket
'06 WK Grand Cherokee Limited Quadra-Drive II, 5.7
'07 MK Compass Limited 4X4, AutoStick
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