Did you perform the Auto Trans Shift Lock Control System Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Automatic Transmission Shift Lock Control

1. Disconnect the auto trans shift lock control switch.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. Probe the feed circuit of the auto trans shift lock control switch with a test lamp that is connected to a good ground.
5. With a scan tool, command the Brake to Shift Output ON.

Does the test lamp illuminate?

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Go to Step 4

Go to Step 3

Test the feed circuit of the auto trans shift lock control switch for a open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 14

Go to Step 6

1. Turn OFF the ignition.
2. Reconnect the auto trans shift lock control switch.
3. Disconnect the auto trans shift lock control solenoid.
4. Turn ON the ignition, with the engine OFF.
5. Probe the feed circuit of the auto trans shift lock control solenoid with a test lamp that is connected to a good ground.
6. With a scan tool, command the Brake to Shift Output ON.

Does the test lamp illuminate?

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Go to Step 10

Go to Step 5

Test the feed circuit of the auto trans shift lock control solenoid for a open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 14

Go to Step 8

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 14

Go to Step 7

Important: After replacement of the BCM perform the set up BCM procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

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Go to Step 14

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1. Check the auto trans shift lock control switch for proper installation and adjustment. Refer to Stop Lamp Switch Adjustment and Stop Lamp Switch Replacement in Brakes.
2. Inspect for poor connections at the auto trans 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?

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Go to Step 14

Go to Step 9

Replace the auto trans shift lock control switch. Refer to Stop Lamp Switch Replacement in Brakes.

Did you complete the replacement?

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Go to Step 14

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1. Connect a test lamp between the feed circuit of the auto trans shift lock control solenoid and the ground circuit of the auto trans shift lock control solenoid.
2. With a scan tool, command the Brake to Shift Output ON.

Does the test lamp illuminate?

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Go to Step 11

Go to Step 13

1. Check the auto trans shift lock control solenoid for proper adjustment. Refer to Automatic Transmission Shift Lock Control Assemble - Off Vehicle in Steering.
2. Inspect for poor connections at the auto trans 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?

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Go to Step 14

Go to Step 12

Replace the auto trans shift lock control solenoid. Refer to Automatic Transmission Shift Lock Control Disassemble - Off Vehicle and Automatic Transmission Shift Lock Control Assemble - Off Vehicle in Steering.

Did you complete the replacement?

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Go to Step 14

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Repair the ground circuit of the auto trans shift lock control solenoid. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 14

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Operate the vehicle within the Conditions for Running the symptom.

Does the symptom reoccur?

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Go to Step 1

System OK