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For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Century 🢒 Transmission/Transaxle 🢒 Shift Lock Control 🢒 Shift Lever Does Not Move with Brake Pedal Depressed

Shift Lever Does Not Move with Brake Pedal Depressed Column Shift

Step

Action

Yes

No

Schematic Reference: Shift Lock Control Schematics

DEFINITION: Transmission shift lever does not move with ignition ON and the brake pedal pressed.

1

Did you perform the Symptoms - Automatic Transmission Shift Lock Control tests and perform all necessary inspections?

Go to Step 2

Go to Symptoms - Automatic Transmission Shift Lock Control

2
  1. Turn ON the ignition, with the engine OFF.
  2. Press and hold the brake pedal.
  3. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Testing for Intermittent Conditions and Poor Connections in wiring systems

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission shift lock control switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Press and hold the brake pedal.
  5. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Step 5

Go to Step 4

4

Connect a test lamp between the A/T shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control solenoid and a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 6

5
  1. Inspect for proper automatic transmission shift lock control switch adjustment. Refer to Stop Lamp Switch Adjustment in Hydraulic Brakes.
  2. Inspect for poor connections at the automatic transmission shift lock control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

6

Inspect for poor connections at the automatic transmission shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

7

Repair the short to battery positive voltage in the A/T shift lock control solenoid voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

--

8

Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the replacement?

Go to Step 10

--

9

Replace the automatic transmission shift lock control solenoid. Refer to Automatic Transmission Shift Lock Actuator Replacement .

Did you complete the replacement?

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2

Shift Lever Does Not Move with Brake Pedal Depressed Console Shift

Step

Action

Yes

No

Schematic Reference: Shift Lock Control Schematics

DEFINITION: Transmission shift lever does not move with the ignition ON and the brake pedal depressed.

1

Did you perform the Symptoms - Automatic Transmission Shift Lock Control tests and all the necessary inspections?

Go to Step 2

Go to Symptoms - Automatic Transmission Shift Lock Control

2
  1. Turn ON the ignition, with the engine OFF.
  2. Press and hold the brake pedal.
  3. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Testing for Intermittent Conditions and Poor Connections in wiring systems

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission shift lock control switch.
  3. Turn ON the ignition. with the engine OFF.
  4. Press and hold the brake pedal.
  5. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Step 9

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission shift lock control solenoid.
  3. Turn ON the ignition. with the engine OFF.
  4. Press and hold the brake pedal.
  5. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Step 12

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Connect a test lamp between the off/run/crank voltage circuit of the park lock solenoid and a good ground.
  3. Turn ON the ignition , with the engine OFF.

Does the test lamp illuminate?

Go to Step 6

Go to Step 13

6
  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission shift lock control solenoid assembly.
  3. Connect a test lamp between the park lock solenoid off/run/crank voltage circuit and the neutral safety switch signal circuit at the automatic transmission shift lock control assembly.
  4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 10

Go to Step 7

7

Connect a test lamp between the neutral safety switch signal circuit at the park/neutral safety switch and battery positive voltage.

Does the test lamp illuminate?

Go to Step 14

Go to Step 8

8

Test for an open in the park/neutral safety switch ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 11

9
  1. Inspect for proper automatic transmission shift lock control switch adjustment. Refer to Stop Lamp Switch Adjustment in Hydraulic Brakes.
  2. Inspect for poor connections at the harness connector of the automatic transmission shift lock control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 15

10

Inspect for poor connections at the harness connector of the automatic transmission shift lock control solenoid assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 16

11
  1. Inspect for proper park/neutral safety switch adjustment. Refer to Park/Neutral Position Switch Adjustment in Automatic Transmission.
  2. Inspect for poor connections at the harness connector of the park/neutral safety switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 17

12

Repair short to battery positive voltage (B+) in the A/T shift lock control solenoid supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

--

13

Repair the open in the off/run/crank voltage circuit of the park lock solenoid. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

--

14

Repair the open in the neutral safety switch signal circuit of the park lock solenoid. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

--

15

Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the repair?

Go to Step 18

--

16

Replace the automatic transmission shift lock control solenoid assembly. Refer to Automatic Transmission Shift Lock Actuator Replacement .

Did you complete the repair?

Go to Step 18

--

17

Replace the park/neutral safety switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transmission.

Did you complete the repair?

Go to Step 18

--

18

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2