GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Aurora 🢒 Steering 🢒 Steering Wheel and Column - Tilt 🢒 Automatic Transmission Shift Lock Control Inoperative

Step

Action

Value(s)

Yes

No

1
  1. Ensure that the ignition switch is in RUN.
  2. Ensure that the gear selector lever is in PARK.
  3. Ensure that the park/neutral position switch C1 is disconnected.
  4. Connect the test lamp between connector C1 terminal B (PNK) and ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Connect the fused jumper between park/neutral position switch connector terminal B (PNK) and C (LT GRN).

Does the shift interlock actuator hold the gear selector lever in PARK (with the brake lever not pressed)?

--

Go to Step 6

Go to Step 5

3
  1. Test the TMNSS fuse in the IP fuse block.
  2. Repair as is necessary

Is the repair complete?

--

Go to Step 4

--

4

Repair CKT 139 for an open.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

5
  1. Ensure that the park/neutral position switch is connected.
  2. Ensure that stoplamp/BTSI switch connector C1 is disconnected.
  3. Connect the test lamp between stoplamp/BTSI switch connector C1 terminal A (LT GRN) and ground.

Does the test lamp light?

--

Go to Step 8

Go to Step 9

6
  1. Test park/neutral position switch connector for proper terminal contact.
  2. Repair as is necessary

Is the repair complete?

--

Go to Step 7

--

7

Replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle - 4T80-E orPark/Neutral Position Switch Replacement in Automatic Transaxle - 4T65-E.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

8

Connect the test lamp between stoplamp/BTSI switch connector C1 terminal A (LT GRN) and B (DK GRN/WHT).

Does the test lamp light?

--

Go to Step 11

Go to Step 10

9

Repair CKT 275 (LT GRN) for an open.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

10
  1. Ensure that stoplamp/BTSI switch connector C1 is connected.
  2. Ensure that the shift interlock actuator is disconnected.
  3. Connect the test lamp between shift interlock actuator connector terminal A (DK GRN/WHT) and ground.

Does the test lamp light?

--

Go to Step 13

Go to Step 14

11
  1. Test stoplamp/BTSI switch connector C1 for proper terminal contact.
  2. Repair as is necessary.

Is the repair complete?

`

--

Go to Automatic Transmission Shift Lock Control System Check

--

12

Replace the stoplamp/BTSI switch. Refer to Brake Switch Replacement in Hydraulic Brakes.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

13

Connect the test lamp between shift interlock actuator connector terminal A (DK GRN/WHT) and B (BLK).

Does the test lamp light?

--

Go to Step 16

Go to Step 15

14

Repair CKT 1135 (DK GRN/WHT) for an open.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

15
  1. Test ground G202 for proper terminal contact.
  2. Repair CKT 150 (BLK) for an open.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

16
  1. Test shift interlock actuator connector for proper terminal contact.
  2. Repair as is necessary.

Is the repair complete?

--

Go to Step 17

--

17

Replace the shift interlock actuator. Refer to Shift Interlock Actuator Replacement.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--