GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Lumina 🢒 Restraints 🢒 SIR 🢒 SECURITY Indicator Always On or Flashing

Step

Action

Value(s)

Yes

No

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

Does the J 35628-A display a key code value of 1 through 15?

--

Go to Step 2

Go to Step 7

2
  1. Write down the key code that is displayed on the J 35628-A .
  2. Turn off the J 35628-A .

    3. Important: This vehicle is equipped with the Supplemental Inflatable Restraint (SIR) system. Do not confuse the key detection CKT 2-way connector (CKT 1073 and CKT 1074) and the yellow 2-way SIR connector.

  3. Connect the J 35628-A .
  4. Insert the ignition key into the ignition key lock cylinder.
  5. Turn on the J 35628-A .
  6. Observe the display on the J 35628-A .

Does the J 35628-A display a key code value of 1 through 15?

--

Go to Step 3

Go to Step 8

3
  1. Disconnect the J 35628-A .
  2. Connect a DMM.
  3. Measure the voltage by backprobing between B+ and the key detection CKT 2-way connector (CKT 1073 and CKT 1074) terminal B on the harness side.

Is the voltage within the specified range?

B+ (10-14 V)

Go to Step 4

Go to Step 9

4
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the theft deterrent module connector.
  3. Reconnect the key detection CKT 2-way connector (CKT 1073 and CKT 1074).
  4. Turn the ignition switch to the RUN position.
  5. Connect a DMM.
  6. Measure the voltage by backprobing between the key detection CKT 2-way connector (CKT 1073 and CKT 1074) terminal  A and the ground.

Is the voltage less than the specified value?

2 V

Go to Step 5

Go to Step 12

5

Use a DMM in order to measure the resistance by backprobing between the key detection CKT 2-way connector (CKT 1073 and CKT 1074) terminal A and the ground.

Is the resistance within the specified range?

∞

Go to Step 6

Go to Step 13

6

Use a DMM to measure the resistance between the theft deterrent module connector terminal B8 and the key detection CKT 2-way connector (CKT 1073 and CKT 1074) terminal A.

Is the resistance less than the specified value?

2 ohms

Go to Step 16

Go to Step 14

7
  1. Clean the ignition key resistor pellet.
  2. Connect a DMM.
  3. Measure the resistance across the resistor pellet.
  4. Compare the resistance value of the pellet with the following values:
    5. • Nominal 402 ohms (386 ohms-438 ohms)
    • Nominal 523 ohms (502 ohms-564 ohms)
    • Nominal 681 ohms (654 ohms-728 ohms)
    • Nominal 887 ohms (852 ohms-942 ohms)
    • Nominal 1130 ohms (1085 ohms-1195 ohms)
    • Nominal 1470 ohms (1411 ohms-1549 ohms)
    • Nominal 1870 ohms (1795 ohms-1965 ohms)
    • Nominal 2370 ohms (2275 ohms-2485 ohms)
    • Nominal 3010 ohms (2890 ohms-3150 ohms)
    • Nominal 3740 ohms (3590 ohms-3910 ohms)
    • Nominal 4750 ohms (4560 ohms-4960 ohms)
    • Nominal 6040 ohms (5798 ohms-6302 ohms)
    • Nominal 7500 ohms (7200 ohms-7820 ohms)
    • Nominal 9530 ohms (9149 ohms-9931 ohms)
    • Nominal 11800 ohms (11328 ohms-12292 ohms)

Does the resistor pellet resistance value match the values listed above?

--

Go to Step 2

Go to Step 15

8
  1. Inspect for a poor connection at the ignition key lock cylinder resistor sensing contacts.
  2. If no problem is found replace the ignition key lock cylinder.

Is the repair complete?

--

Go to Step 3

--

9
  1. Disconnect the theft deterrent module.
  2. Connect a DMM.
  3. Measure the resistance between the theft deterrent module harness connector terminal B7 and the key detection CKT 2-way connector (CKT 1073 and CKT 1074) terminal B.

Is the resistance less than the specified value?

2 ohms

Go to Step 10

Go to Step 11

10

Inspect CKT 1550 for a poor connection or an open.

Is the repair complete?

--

Go to Step 4

--

11

Repair a poor connection or an open in CKT 1074.

Is the repair complete?

--

Go to Step 4

--

12

Repair a short to B+ in CKT 1073.

Is the repair complete?

--

Go to Step 5

--

13

Repair a short to ground in CKT 1073.

Is the repair complete?

--

Go to Step 6

--

14

Repair a poor connection or an open in CKT 1073.

Is the repair complete?

--

Go to Step 16

--

15

Replace the ignition key. Refer to Programming Additional Keys .

Is the repair complete?

--

Go to Step 7

Go to Step 16

16
  1. Turn the ignition switch to the LOCK position.
  2. Reconnect any connectors/components removed.

Is the repair complete?

--

Go to Vehicle Theft Deterrent (VTD) System Check

--