Key-On System Initialization

At key-on, the BCM performs a check to see if the EBCM is responding the BCM inputs. After the ignition is moved to the RUN position, the TCS Enable line goes to 12 volts. When the BCM is done performing its power-up sequence, the TCS Active line will be pulled up to 12 volts. The ABS/TCS Fault line is held at ground until the accumulator has reached its proper operating level. The DISABLED and TRACTION DISABLED messages will remain on until the correct pressure is reached. The BRAKE indicator lamp will also remain illuminated until the accumulator is charged.