Wrangler 4WD L4-150 2.5L VIN P MFI (1998)
the following steps.
3. Enter secured access mode using the unique 4 digit PIN number.
4. Program the vehicle's VIN number into the SKIM's memory.
5. Program the country code into the SKIM's memory (U.S.).
6. Transfer the vehicle's unique Secret Key data from the PCM. This process will require the SKIM module to be in secured access mode. The PIN
number must be entered into the DRB before the SKIM will enter secured access mode. Once secured access mode is active, the SKIM will remain
in that mode for 60 seconds.
7. Program all customer keys into the SKIM's memory. This requires that the SKIM be in secured access mode. The SKIM module will immediately
exit secured access mode after each key is programmed.
Note: Secured access mode is not required to query the programmed status of the key.
Note 1: If a PCM is replaced, the unique Secret Key data must be transferred from the SKIM module to the PCM. This procedure requires the SKIM to
be placed in secured access mode using the 4-digit PIN code.
Note 2: If three attempts are made to enter secured access mode using an incorrect PIN, secured access mode will be locked out for one hour. To exit this
locked out mode, turn the ignition to the Run position for one hour. (Ensure all accessories are turned off. Also monitor the battery state and connect a
battery charger if necessary).
To program Smart Keys using the "customer programming" method, which requires two valid smart keys, refer to either the owner's or service manuals.
Vehicle Communication
Vehicle Communication
The Chrysler Collision Detection multiplex system (CCD bus) consists of a twisted pair of wires. These wires run from one module to another. They
receive and deliver coded information between the modules. The information is coded to identify the message as well as the importance of the message.
When there are multiple messages trying to access the CCD bus at one time, the code determines the message that has higher priority, which is then
allowed to access the bus first.
The two wires of the twisted pair that make up the CCD multiplex system are called "bus(+)" (bus plus) and "bus(-)" (bus minus) respectively. Each wire
has a measurable voltage level of approximately 2.5 volts. In order to maintain the 2.5 volts on each line and provide a means of transportation for the
coded messages, there is a "voltage divider network". This network consists of the Instrument Cluster module which supplies bias and the PCM which
supplies termination. Bias is the part of the voltage divider network that places both bus(+) and bus(-) at 2.5 volts. Termination in the circuitry is
required to complete the voltage divider network and also provides some electromagnetic protection for the bus.
NOTE: Communication over the bus is essential to the proper operation of the vehicle's on-board diagnostic systems and the DRB. Problems with the
operation of the bus or DRB must be corrected before proceeding with diagnostic testing. If there is a problem, refer to Vehicle Communication.
