GM Service Manual Online
For 1990-2009 cars only

Trans Does Not Shift Out of Park, Brake Applied

Step

Action

Value(s)

Yes

No

DEFINITION: Transmission does not shift out of PARK with the brake pedal depressed and the ignition switch in RUN.

1

  1. Disconnect the BTSI switch connector.
  2. Use a DMM to measure the voltage at terminal B.

Is the voltage within the the specified range?

10.0-14.0V

Go to Step 4

Go to Step 2

2

  1. Depress the brake pedal.
  2. Reconnect the BTSI switch.
  3. Use a DMM to measure for continuity between the BTSI switch terminal A and terminal B.

Is there continuity?

--

Go to Step 5

Go to Step 3

3

Replace the Brake Transmission Shift Lock Control Solenoid.

Is the repair complete?

Recheck System Operation

--

4

Repair the short to B+ in CKT 1135.

Is the repair complete?

--

Recheck System Operation

--

5

Replace the BTSI Switch.

Is the repair complete?

--

Recheck System Operation

--