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 ACC 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 ACC position |
| • | Foot brake is applied (output is ON) |
| • | Circuit 816 is shorted to battery voltage |
| • | Security light, service (wrench) light, and MIL light are always On with
ignition Off. |
| • | Allows you to shift out of PARK without applying the brake pedal. |
Diagnostic Aids
| • | Inspect wiring harness for damage. Check for broken or chafed insulation. |
| • | If fault is suspected to be intermittent, wiggling harness wiring may
help in locating fault. |
| • | Check for poor connection at the BCM. Inspect harness connectors for backed
out terminals, improper terminal mating, broken connector locks, improperly formed
or damaged terminals and poor terminal to wire connection (terminal crimped over wire
insulation and not conductors). |
B2708
