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

  1. Disconnect the transaxle range switch connector C2.
  2. Connect the test lamp between the transaxle range switch connector, terminal B and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 439.

Is the repair complete?

--

System OK

Go to Step 4

4

  1. Connect the transaxle range switch connector.
  2. Disconnect the brake switch connector C2.
  3. Connect the test lamp between connector C2, terminal C of the brake switch and ground.

Does the test lamp light?

--

Go to Step 10

Go to Step 5

5

Test for an open in CKT 275.

Did you find an open in CKT 275?

--

Go to Step 6

Go to Step 7

6

Repair the open to CKT 275.

Is the repair complete?

--

System OK

--

7

Test the alignment of the transaxle range switch.

Is the transaxle range switch aligned correctly?

--

Go to Step 9

Go to Step 8

8

Align the transaxle range switch.

Is the repair complete?

--

System OK

--

9

Replace the transaxle range switch.

Is the repair complete?

--

System OK

--

10

  1. Connect the back switch connector.
  2. Backprobe connector C2, terminal D of the brake switch to ground.
  3. Turn the ignition switch to RUN.

Does the test lamp light?

--

Go to Step 14

Go to Step 11

11

Is the brake switch adjusted properly?

--

Go to Step 13

Go to Step 12

12

Adjust the brake switch.

Is the repair complete?

--

System OK

--

13

Replace the brake switch.

Is the repair complete?

--

System OK

--

14

  1. Disconnect the BTSI solenoid connector (column shift vehicles) or the automatic transaxle control connector (console shift vehicles).
  2. Connect the test lamp between terminal B of the BTSI solenoid and ground.
  3. Turn the ignition switch to RUN.

Does the test lamp light?

--

Go to Step 16

Go to Step 15

15

Repair the open in CKT 1135 between the BTSI solenoid (column shift vehicles) or the automatic transaxle control (console shift vehicles) and the brake switch.

Is the repair complete?

--

System OK

--

16

Connect the test lamp between terminal E and terminal A (column shift vehicles) or the automatic transaxle control (console shift vehicles).

Does the test lamp light?

--

Go to Step 18

Go to Step 17

17

Repair the open in CKT 150.

Is the repair complete?

--

System OK

--

18

Test the transaxle linkage for sticking or binding.

Does the linkage stick or bind?

--

Go to Step 19

Go to Step 20

19

Repair the linkage.

Is the repair complete?

--

System OK

--

20

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

Is the repair complete?

--

System OK

--