Circuit Description
The brake transmission shift interlock (BTSI) solenoid is energized by the body
control module (BCM) switching circuit 816 to ground while ignition is in RUN. When
energized, the BTSI solenoid will allow shifting from PARK. A condition for shifting
from PARK is the foot brake must be applied. The BCM receives this information over
the serial data link from the engine controller. The BTSI solenoid will allow shifting
from PARK when ignition is in the ACCY position without a brake pedal input.
The BCM also monitors ignition 1 circuit 339 and ignition 2 circuit 743 to determine
if the ignition switch is in the RUN or ACC position.
Conditions for Setting the DTC
| • | Ignition in RUN or ACCY position |
| • | Circuit 816 is shorted to battery voltage |
Diagnostic Aids
| • | Inspect wiring harness for damage. Check for broken or chaffed insulation. |
| • | If fault is suspected to be intermittent, wiggling harness wiring may
help in locating fault. |
B2708
