GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the BTSI System Check performed?

--

Go to Step 2

Go to Automatic Transmission Shift Lock Control System Check

2

Is this a column shift vehicle?

--

Go to Step 3

Go to Step 4

3

  1. Move the gear selector to the PARK position.
  2. Disconnect the automatic transaxle control connector
  3. Turn the ignition switch to RUN.
  4. Connect the test lamp between terminal B and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 8

4

  1. Disconnect the brake switch connector C2.
  2. Move the ignition switch to RUN.

Can you shift the transaxle out of the PARK position?

--

Go to Step 5

Go to Step 8

5

Is the brake switch adjusted properly?

--

Go to Step 6

Go to Step 7

6

Replace the brake switch.

Is the repair complete?

--

System OK

--

7

Adjust the brake switch.

Is the repair complete?

--

System OK

--

8

  1. Disconnect the BTSI solenoid connector (column shift vehicles) or disconnect the automatic transaxle control connector (console shift vehicles).
  2. Move the ignition switch to RUN.

Can you shift the transaxle out of the PARK position?

--

Go to Step 9

Go to Step 10

9

Repair the short to power in CKT 1135.

Is the repair complete?

--

System OK

--

10

Test for sticking or binding in the shift linkage.

Does the shift linkage stick or bind?

--

Go to Step 11

Go to Step 12

11

Repair the shift linkage.

Is the repair complete?

--

System OK

--

12

Replace the BTSI solenoid (column shift vehicles) or replace the automatic transaxle control (console shift vehicles).

Is the repair complete?

--

System OK

Go to Step 1