GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Make sure the vehicle is in the non-PARK position.
  2. Turn the ignition switch to the OFF position.
  3. Using a test lamp, connect between the automatic transaxle control (BTSI) connector terminal C circuit 1134 and ground

Does the test lamp illuminate?

--

Go to Step 2

Go to Step 3

2

  1. Disconnect the automatic transaxle control (BTSI) connector.
  2. Leave the test lamp in the same location.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 5

3

Replace the steering column electric park lock Refer to Electric Park Lock Module - Disassemble - Off Vehicle and Electric Park Lock Module - Assemble - Off Vehicle for service procedure.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--

4

Repair a short to B+ in circuit 1134.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--

5

Replace the automatic transaxle control (BTSI). Refer to Transmission Control Replacement for service procedure.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--

6

Check the PARK LOCK fuse for an open.

Is the PARK LOCK fuse open?

Go to Steering Column Lock Diagnostic System Check

Go to Step 7

7

  1. Make sure the vehicle is in the PARK position.
  2. Turn the ignition switch to the RUN position.
  3. Using a test lamp, connect between the automatic transaxle control (BTSI) connector terminal F circuit 1134 and ground.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 11

8

Using a test lamp, connect between the automatic transaxle control (BTSI) connector terminal C circuit 1134 and ground.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 14

9

Using a test lamp, connect between the steering column electric park lock connector terminal A circuit 1134 and ground.

Does the test lamp illuminate?

--

Go to Step 10

Go to Step 12

10

Using a test lamp, connect between the steering column electric park lock connector terminal A circuit 1134 and terminal B circuit 1450.

Does the test lamp illuminate?

--

Go to Step 15

Go to Step 13

11

Repair poor connection or open in circuit 1600.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--

12

Repair poor connection or open in circuit 1134.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--

13

Repair an open in circuit 1450.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--

14

Replace the automatic transaxle control (BTSI). Refer to Transmission Control Replacement for service procedure.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--

15

Replace the steering column electric park lock Refer to Electric Park Lock Module - Disassemble - Off Vehicle and Electric Park Lock Module - Assemble - Off Vehicle for service procedure.

Is the repair complete?

--

Go to Steering Column Lock Diagnostic System Check

--