GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Important: Inspect all of the keys for matching codes.

  1. Insert the ignition key into the J 35628-A .
  2. Turn the J 35628-A ON.
  3. Read the key code on the display of the J 35628-A .

Is the key code a value of 1-15?

1-15

Go to Step 2

Go to Step 5

2

  1. Write down the key code that the J 35628-A displayed.
  2. Turn the J 35628-A OFF.
  3. Connect the J 35628-A to the 2-way ignition switch lock cylinder harness connector at the base of the steering column.
  4. Insert the ignition key into the ignition switch lock cylinder.
  5. Turn the J 35628-A ON.
  6. Observe the display on the J 35628-A .

Is the key code the same as the code recorded in step 1?

--

Go to Step 3

Go to Step 6

3

Using a test lamp, frontprobe the 2-way connector at the base of the steering column, between terminal B (BCM side) and B+.

Does the test lamp light?

--

Go to Step 4

Go to Step 7

4

  1. Test for an open in circuit 1073.
  2. Test for a short to B+ in circuit 1073.
  3. Test for a short to ground in circuit 1073.
  4. If circuit 1073 is OK, replace the BCM. Refer to Body Control Module Replacement .

Is the repair complete?

--

System OK

--

5

  1. Clean the key.
  2. Retest the key. If the key code is invalid, replace the key. Refer to Body Control Module (BCM) Programming/RPO Configuration .

Did you replace the key?

--

System OK

--

6

Important: If you repair the lock cylinder harness, the SECURITY indicator will remain ON for approximately 1 minute.

Inspect for a poor connection. If the connection is OK, replace the ignition switch lock cylinder. Refer to Ignition Switch Replacement - On Vehicle floor

or Ignition Switch Replacement - On Vehicle colum .

Is the repair complete?

--

System OK

--

7

  1. Disconnect the BCM.
  2. Connect a test lamp between the BCM connector C3 terminal C1 and B+.

Does the test lamp light?

--

Go to Step 8

Go to Step 9

8

  1. Test for poor connections at BCM connector C3 terminal C2 and terminal D7.
  2. Test for an open in circuit 1074.
  3. If all connections are OK, replace the BCM. Refer to Body Control Module Replacement .

Is the repair complete?

--

System OK

--

9

Repair the open in circuit in 650.

Is the repair complete?

--

System OK

--