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SECTION VIIC
SERVICE PROGRAMMING SYSTEM
Control Module Stand-Alone Programming Adapter (J-45211) for Cadillacs
The J-45211 control module stand-alone programming adapter (Figure VIIC-41), also called the PCM
programming adapter harness, is used to connect the Tech 2 to a vehicle’s PCM and perform SPS
functions for the 2000 or later Cadillac models DeVille, Seville, and Eldorado. The J-45211 isolates the
PCM from a vehicle’s electrical system so that the activity of other on-board computers cannot interrupt
the communication between the Tech 2 and the PCM.
NOTICE
Failure to maintain unbroken J-45211 connections (PCM, Tech 2, power, and ground) throughout the
entire programming procedure may cause an interruption, resulting in PERMANENT PCM DAMAGE.
Procedure for Using the J-45211 Tool:
1. Ensure that the Techline terminal and the Tech 2 are updated with their latest respective software.
2. Turn the vehicle ignition off and remove the key from the ignition lock cylinder. Turn off all electrical
power consumers and accessories.
3. Open the hood and measure the battery voltage directly at the battery positive and negative terminals
using the J-39200 digital multimeter. If the negative battery terminal is inaccessible, or the battery is not
located under the hood, check the voltage between engine block ground and the underhood “+” junction
block.
4. If the vehicle’s battery voltage is not 12.0 volts or higher, charge the battery before continuing. When
finished charging the battery, disconnect the charger from the battery before programming the PCM.
Figure VIIC-41
Control module stand-alone programming adapter J-45211
Procedure for the J-45211 continued on next page...
2005
Tech 2 User’s Guide
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