B2708

B2708 - GEARSHIFT UNLOCK CIRCUIT HIGH





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 condition.

DTC SET CONDITIONS
- Ignition in RUN or ACC position
- Foot brake is applied (output is ON)
- Circuit 816 is shorted to battery voltage
- No telltale will illuminate

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 (2001)