GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Monte Carlo 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 SECURITY Indicator On, Engine Does Not Crank

Step

Action

Value(s)

Yes

No

1

Did you perform the Vehicle Theft Deterrent System Check?

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Go to Step 2

Go to Vehicle Theft Deterrent (VTD) System Check

2

If any PCM DTC's are present, refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls-3.1L or Powertrain On Board Diagnostic (OBD) System Check in Engine Controls-3.8L.

Have you cleared all outstanding DTCs?

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Go to Step 3

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3
  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?

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Go to Step 4

Go to Step 9

4
  1. Write down the key code 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) with 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. While observing the display on the J 35628-A turn the ignition switch to RUN.

Does the J 35628-A display a key code value that matches the key code value recorded in step 1?

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Go to Step 5

Go to Step 10

5
  1. Disconnect the J 35628-A .
  2. Connect a J 39200 Digital Multimeter (DMM).
  3. Measure the voltage by backprobing between B+ and the key detection CKT 2-way connector (CKT 1073 and CKT 1074) terminal B (harness side).

Is the voltage within the specified range?

B+ (10-14 V)

Go to Step 6

Go to Step 11

6
  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 J 39200 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 7

Go to Step 14

7

Use a J 39200 DMM 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 8

Go to Step 15

8
  1. Connect a J 39200 DMM.
  2. 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?

2ohms

Go to Step 18

Go to Step 16

9
  1. Clean the ignition key resistor pellet.
  2. Connect a J 39200 DMM.
  3. Measure the resistance across the resistor pellet.
  4. Compare the resistance value of the pellet with the following values:
    5. • Nominal: 402ohms (386-438ohms)
    • Nominal: 523ohms (502-564ohms)
    • Nominal: 681ohms (654-728ohms)
    • Nominal: 887ohms (852-942ohms)
    • Nominal: 1130ohms (1085-1195ohms)
    • Nominal: 1470ohms (1411-1549ohms)
    • Nominal: 1870ohms (1795-1965ohms)
    • Nominal: 2370ohms (2275-2485ohms)
    • Nominal: 3010ohms (2890-3150ohms)
    • Nominal: 3740ohms (3590-3910ohms)
    • Nominal: 4750ohms (4560-4960ohms)
    • Nominal: 6040ohms (5798-6302ohms)
    • Nominal: 7500ohms (7200-7820ohms)
    • Nominal: 9530ohms (9149-9931ohms)
    • Nominal: 11800ohms (11328-12292ohms)

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

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Go to Step 4

Go to Step 17

10
  1. Inspect for a poor connection at the ignition key lock cylinder resistor sensing contacts.
  2. If the connection is OK, replace the ignition key lock cylinder. Refer to Steering Column Lock Cylinder Set - Disassemble - Off Vehicle or to Steering Column Lock Cylinder Set - Disassemble - Off Vehicle in Steering.

Is the repair complete?

--

Go to Step 5

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11
  1. Disconnect the theft deterrent module.
  2. Connect a J 39200 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 on the harness side.

Is the resistance less than the specified value?

2ohms

Go to Step 12

Go to Step 13

12

Inspect CKT 1550 for a poor connection or an open.

Is the repair complete?

--

Go to Step 6

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13

Repair the poor connection or the open in CKT 1074.

Is the repair complete?

--

Go to Step 6

--

14

Repair the short to B+ in CKT 1073.

Is the repair complete?

--

Go to Step 7

--

15

Repair the short to ground in CKT 1073.

Is the repair complete?

--

Go to Step 8

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16

Repair the poor connection or the open in CKT 1073.

Is the repair complete?

--

Go to Step 18

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17

Replace the ignition key. Refer to Programming Additional Keys .

Is the repair complete?

--

Go to Step 18

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18
  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

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