GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: Inspect for mechanical binding and ensure that the transmission linkage is adjusted properly prior to performing this diagnostic procedure.

1

Did you perform the Auto Trans Shift Lock Control System Check?

--

Go to Step 2

Go to Automatic Transmission Shift Lock Control System Check

2

Is the BTSI fuse open?

--

Go to Step 10

Go to Step 3

3

  1. Turn the ignition switch to the ON position. Do not start the engine.
  2. Disconnect the TCC/stoplamp switch.
  3. Connect a test lamp between the TCC/stoplamp switch connector terminal E and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open in CKT 584 (LT GRN/BLK).

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

5

Using a J 39200 DMM, test the TCC/stoplamp switch for proper operation.

Does the TCC/stoplamp operate properly?

--

Go to Step 7

Go to Step 6

6

Replace the TCC/stoplamp switch.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

7

Test CKT 1135 for an open or high resistance. Repair as necessary.

Did you find and repair a condition?

--

Go to Automatic Transmission Shift Lock Control System Check

Go to Step 8

8

Test CKT 1850 for an open or high resistance. Repair as necessary.

Did you find and repair a condition?

--

Go to Automatic Transmission Shift Lock Control System Check

Go to Step 9

9

Replace the BTSI solenoid.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

10

  1. Remove the BTSI fuse.
  2. Disconnect the TCC/stoplamp switch.
  3. Connect a test lamp between the TCC/stoplamp switch connector terminal E and battery power.

Does the test lamp light?

--

Go to Step 11

Go to Step 12

11

Locate and repair a short to ground in CKT 584 (LT GRN/BLK).

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

12

Connect a test lamp between the TCC/stoplamp switch connector terminal F and battery power.

Does the test lamp light?

--

Go to Step 13

Go to Step 9

13

Locate and repair a short to ground in CKT 1135 (DK GRN/WHT).

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--