GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Automatic Transmission Shift Lock Control System Check?

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Go to Step 2

Go to Automatic Transmission Shift Lock Control System Check

2

Disconnect the Automatic Transmission Shift Lock Control with the ignition key in the RUN position and the shift lever in PARK.

Does the shift linkage unlock?

--

Go to Step 3

Go to Step 4

3

  1. Disconnect the Brake Pedal Position (BPP) switch connector.
  2. Connect a test lampJ 35616-200 from CKT 1135 (DK GRN/WHT) cavity E at the Brake Pedal Position (BPP) switch connector and ground.

Did the test lamp light?

--

Go to Step 5

Go to Step 6

4

Remove the Automatic Transmission Shift Lock Control solenoid assembly. Refer to Automatic Transmission Shift Lock Control Disassemble - Off Vehicle .

Does the shift linkage unlock?

--

Go to Step 7

Go to Symptom Diagnosis in Automatic Transmission

5

Repair the short to voltage in CKT 1135 (DK GRN/WHT) between the Brake Pedal Position (BPP) switch connector and the Automatic Transmission Shift Lock Control solenoid connector.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

6

Replace the Brake Pedal Position (BPP) switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

--

7

Replace the Automatic Transmission Shift Lock Control solenoid. Refer to Automatic Transmission Shift Lock Control Assemble - Off Vehicle .

Is the repair complete?

--

Go to Automatic Transmission Shift Lock Control System Check

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