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 automatic transaxle control connector.
  2. Place the ignition switch in the OFF-UNLOCK or the RUN position.
  3. Connect the test lamp between terminal F and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 1020.

Is the repair complete?

--

System OK

--

4

  1. Place the gear selector in the PARK position.
  2. Connect the automatic transaxle control connector.
  3. Backprobe terminal C to ground.

Does the test lamp light?

--

Go to Step 8

Go to Step 5

5

Test for binding or for out of adjustment linkage.

Is the linkage correctly adjusted?

--

Go to Step 6

Go to Step 7

6

Replace the automatic transaxle control. Refer to the TURM manual.

Is the repair complete?

--

System OK

--

7

Correct the linkage.

Is the repair complete?

--

System OK

--

8

  1. Disconnect the ignition lock solenoid.
  2. Place the gear selector in the PARK position.
  3. Place the ignition switch in RUN.
  4. Connect the test lamp between terminal A and ground.

Does the test lamp light?

--

Go to Step 10

Go to Step 9

9

Repair the open in CKT 961.

Is the repair complete?

--

System OK

--

10

Connect the test lamp between terminal A and terminal B.

Does the test lamp light?

--

Go to Step 12

Go to Step 11

11

Repair the open in CKT 150.

Is the repair complete?

--

System OK

--

12

Replace the ignition lock solenoid.

Is the repair complete?

--

System OK

--