GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Firebird 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 Ignition Lock Cylinder Test

Step

Action

Value(s)

Yes

No

Important: 

   • Inspect all of the keys for matching codes.
   • After you repair the lock cylinder harness, the SECURITY indicator will remain ON for approximately 1 minute.

1
  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 a poor connection at the ignition key lock cylinder and I/P harness connector terminals A and B.
  2. Test for an open in circuit 1073.
  3. Test for a short to B+ in circuit 1073.
  4. Test for a short to ground in circuit 1073.
  5. If circuit 1073 is OK, replace the BCM. Refer to Body Control Module Replacement in Body Control Systems.

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 Programming Additional Keys or Programming Replacement Keys, Ignition Cylinder, or Powertrain Control Module .

Did you replace the key?

--

System OK

--

6

Inspect for a poor connection at the ignition key lock cylinder connector terminals A and B. If the connection is OK, replace the ignition switch lock cylinder. Refer to Ignition Lock Cylinder Replacement - On Vehicle .

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 in Body Control Systems.

Is the repair complete?

--

System OK

--

9

Repair the open in circuit in 650.

Is the repair complete?

--

System OK

--