GM Service Manual Online
For 1990-2009 cars only
Table 1: Ignition Key Can Be Turned to the Locked Position with the Transaxle Out of Park
Table 2: Ignition Key Cannot Turn to the Lock Position with the Transaxle in the Park Position

Ignition Key Can Be Turned to the Locked Position with the Transaxle Out of Park

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 Step 6

--

4

Repair a short to B+ in circuit 1134.

Is the repair complete?

--

Go to Step 6

--

5

Replace the automatic transaxle control (BTSI). Refer to Automatic Transmission Shift Lock Control Disassemble - Off Vehicle in Automatic Transaxle-4T65-E for service procedure.

Is the repair complete?

--

Go to Step 6

--

6

Verify that the system operates properly.

Does the system operate properly?

--

System OK

Go to Steering Column Lock Diagnostic System Check

Ignition Key Cannot Turn to the Lock Position with the Transaxle in the Park Position

Step

Action

Value(s)

Yes

No

1

Check the PARK LOCK fuse for an open.

Is the PARK LOCK fuse open?

--

Go to Step 2

Go to Step 7

2

Disconnect connector C 201.

Use a test lamp, connected to B+, to probe connector C 201 terminal  D3.

Does the test lamp light?

--

Go to Step 3

Go to Step 15

3

Disconnect the automatic transaxle control.

Use a test lamp, connected to B+, to probe the automatic transaxle control connector terminal  F.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

4

Locate and repair a short to ground in circuit 1600 (PPL).

Is the repair complete?

--

Go to Step 16

--

5

Use a test lamp, connected to B+, to probe the automatic transaxle control connector terminal  C.

Does the test lamp light?

--

Go to Step 6

Go to Step 14

6

Locate and repair a short to ground in circuit 1134 (LT BLU).

Is the repair complete?

--

Go to Step 16

--

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 Step  6

--

12

Repair poor connection or open in circuit 1134.

Is the repair complete?

--

Go to Step 16

--

13

Repair an open in circuit 1450.

Is the repair complete?

--

Go to Step 16

--

14

Replace the automatic transaxle control (BTSI). Refer to Automatic Transmission Shift Lock Control Disassemble - Off Vehicle for service procedure.

Is the repair complete?

--

Go to Step 16

--

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 Step 16

--

16

Verify that the system operates properly.

Does the system operate properly?

--

System OK

Go to Steering Column Lock Diagnostic System Check