Automatic Transmission Shift Lock Control Always On With Ignition in RUN. Buick Riviera 1999

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1999 🢒 Riviera 🢒 Steering 🢒 Steering Wheel and Column - Tilt 🢒 Automatic Transmission Shift Lock Control Always On With Ignition in RUN

Step

Action

Value(s)

Yes

•	Ensure that the ignition switch is in RUN.

•	Ensure that the gear selector is in park

•	Ensure that stoplamp/BTSI switch connector C1 is disconnected.

•	Press the brake pedal and hold.

•	Move the gear selector to NEUTRAL.

Does the gear selector shift to neutral?

Go to Step 3

Go to Step 2

•	Ensure that the shift interlock actuator is disconnected.

•	Connect the test lamp between terminal A (DK GRN/WHT) and ground.

Does the test lamp light?

Go to Step 7

Go to Step 5

•	Test stoplamp/BTSI switch connector C1 for proper terminal contact.

•	Repair as is necessary.

Is the repair complete?

Go to Step 4

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

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

•	Test shift interlock actuator connector for proper terminal contact.

•	Repair as is necessary.

Is the repair complete?

Go to Step 6

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

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check

Repair CKT 1135 (DK GRN/WHT) for a short to B+

Is the repair complete?

Go to Automatic Transmission Shift Lock Control System Check