GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: Transmission shift lever does not lock in the PARK position with the ignition ON and the brake pedal not pressed.

1

Did you perform the Symptom - Automatic Transmission Shift Lock control tests and all the necessary inspections?

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Go to Step 2

Go to Symptoms - Automatic Transmission Shift Lock Control

2

  1. Connect a test lamp between the park/neutral position switch power feed circuit at the park/neutral position switch and a good ground.
  2. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 8

3

  1. Ensure transmission shift lever is in the PARK position.
  2. Connect a test lamp between the park/neutral position switch signal circuit at the park/neutral position switch and a good ground.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 12

4

Connect a test lamp between the park/neutral position switch signal circuit at the automatic transmission shift lock control switch and a good ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 9

5

  1. Connect a test lamp between the automatic transmission shift lock control switch signal circuit at the automatic transmission shift lock control switch and a good ground.
  2. Press the brake pedal and release several times.

Does the test lamp turn ON and OFF with the brake pedal?

--

Go to Step 6

Go to Step 14

6

  1. Connect a test lamp between the automatic transmission shift lock control switch signal circuit at the automatic transmission shift lock control solenoid and a good ground.
  2. Press the brake pedal and release several times.

Does the test lamp turn ON and OFF with the brake pedal?

--

Go to Step 7

Go to Step 10

7

Connect a test lamp between the automatic transmission shift lock control solenoid ground circuit at the automatic transmission shift lock control solenoid and battery positive voltage (B+).

Does the test lamp illuminate?

--

Go to Step 16

Go to Step 11

8

Repair open in the park/neutral position switch power feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 18

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9

Repair open in the park/neutral position switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 18

--

10

Repair open in the automatic transmission shift lock control switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 18

--

11

Repair open in the automatic transmission shift lock control solenoid ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 18

--

12

    • Inspect for proper adjustment of the park/neutral position switch. Refer to Park/Neutral Position Switch Adjustment .
    • Inspect for poor connections at the park/neutral position 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 13

13

Replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement .

Did you complete the repair?

--

Go to Step 18

--

14

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 18

Go to Step 15

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

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 18

Go to Step 17

17

Replace the automatic transmission shift lock control solenoid. Refer to Automatic Transmission Shift Lock Control Actuator Replacement - On Vehicle or Automatic Transmission Shift Lock Control Actuator Replacement - On Vehicle in Steering Wheel and Column.

Did you complete the repair?

--

Go to Step 18

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18

Operate the system in order to verify the repair.

Did you find and correct the condition?

--

System OK

Go to Step 2