GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the brake switch connector C2.
  2. Turn the ignition switch to the RUN position

Can you shift the transaxle out of PARK?

--

Go to Step 2

Go to Step 3

2

Inspect the adjustment of the brake switch. If the adjustment of the brake switch is correct, replace the brake switch.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

3

Disconnect connector C3 the left IP wiring harness junction block.

Can you shift the transaxle out of PARK?

--

Go to Step 4

Go to Step 5

4

Repair the short to battery in CKT 1135 between the left IP wiring harness junction block and the brake switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

5

Disconnect connector C2 of the left IP wiring harness junction block.

Can you shift the transaxle out of PARK?

--

Go to Step 6

Go to Step 7

6

Replace the left IP wiring harness junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

7

Disconnect the BTSI solenoid connector.

Can you shift the transaxle out of PARK?

--

Go to Step 8

Go to Step 9

8

Repair the short to battery in CKT 1135 between the left IP wiring harness junction block and the BTSI solenoid.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

9

Replace the BTSI solenoid.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--