GM Service Manual Online
For 1990-2009 cars only

SECURITY Indicator Always On or Flashing Non-SEO

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.

  4. Connect the J 35628-A .
  5. Insert the ignition key into the ignition key lock cylinder.
  6. Turn on the J 35628-A .
  7. 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 within the specified range?

Less than 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

--

SECURITY Indicator Always On or Flashing SEO

Step

Action

Value(s)

Yes

No

1

Are any PCM DTC's present?

--

Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls (3.1) or Powertrain On Board Diagnostic (OBD) System Check in Engine Controls (3.8)

Go to Step 2

2

Inspect the IGN SWI MAXI-FUSE® in the engine wiring junction block 2.

Is the IGN SWI MAXI-FUSE® open?

--

Go to Step 18

Go to Step 3

3

  1. Verify that the battery is completely charged. Refer to Battery Check in Engine Electrical.
  2. Connect a DMM by backprobing between the starter terminal S and the ground.
  3. Use a DMM to measure the voltage while turning the ignition switch to the START position.

Is the voltage within the specified range?

9.5 V or Greater

Go to Step 4

Go to Step 5

4

  1. Disconnect the DMM.
  2. Install the remote starter switch.
  3. Engage the starter with the remote starter switch.

Does the starter crank the engine?

--

Go to Step 19

Go to Step 20

5

  1. Disconnect fuse 7 in the fuse block.
  2. Connect a test light between fuse 7 terminal G9 and the ground.
  3. Monitor the test light while turning the ignition switch to the START position.

Does the test light illuminate?

--

Go to Step 15

Go to Step 6

6

  1. Turn the ignition switch to the LOCK position.
  2. Connect a test light by backprobing between C201 terminal B6 and the ground.
  3. Monitor the test light while turning the ignition switch to the START position.

Does the test light illuminate?

--

Go to Step 15

Go to Step 7

7

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect C201.
  3. Connect a test light between C201 terminal D5 and the ground.

Is the test light on?

--

Go to Step 22

Go to Step 21

8

Inspect fuse 7 in the fuse block.

Is fuse 7 open?

--

Go to Step 9

Go to Step 10

9

  1. Replace fuse 7.
  2. Turn the ignition switch to the START position.
  3. Inspect fuse 7 again.

Is fuse 7 open again?

--

Go to Step 25

Go to Step 10

10

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the transaxle range switch electrical connector C1.
  3. Verify that the transaxle is in PARK.
  4. Use a DMM to measure the resistance between the transaxle range switch connector C1 terminals E and G on the switch side.

Is the resistance within specified the specified range?

Less than 2 ohms

Go to Step 11

Go to Step 26

11

  1. Remove fuse 7 in the fuse block.
  2. Use a DMM to measure the resistance between the fuse 7 terminal G10 and the transaxle range switch harness connector C1 terminal E on the harness side.

Is the resistance within the specified range?

Less than 2 ohms

Go to Step 12

Go to Step 27

12

  1. Disconnect the theft deterrent relay.
  2. Use a DMM to measure the resistance between the theft deterrent relay harness connector terminal C2 and the transaxle range switch harness connector C1 terminal G.

Is the resistance within the specified range?

Less than 2 ohms

Go to Step 13

Go to Step 28

13

  1. Disconnect the theft deterrent module connector.
  2. Use a DMM to measure the resistance between the theft deterrent module harness connector terminal A4 and the theft deterrent relay harness connector terminal A1.

Is the resistance within the specified range?

Less than 2 ohms

Go to Step 14

Go to Step 29

14

Use a DMM to measure the resistance between the theft deterrent relay terminals A1 and C2 (relay side).

Is the resistance within the specified range?

75-110 ohms

Go to Step 30

Go to Step 31

15

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the theft deterrent relay connector.
  3. Connect a test light between the theft deterrent relay harness connector terminal A2 and the ground.
  4. Observe the test light while turning the ignition switch to the START position.

Does the test light illuminate?

--

Go to Step 16

Go to Step 23

16

  1. Turn the ignition switch to the LOCK position.
  2. Connect a 50A fused jumper between the theft deterrent relay harness connector terminals A2 and C1.
  3. Turn the ignition switch to the START position.

Does the starter crank the engine?

--

Go to Step 8

Go to Step 17

17

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the starter electrical connector.
  3. Use a DMM to measure the resistance between the starter harness connector terminal S and the theft deterrent relay harness connector terminal C1.

Is the resistance within the specified range?

Less than 2 ohms

Go to Step 4

Go to Step 24

18

  1. Inspect for a short to ground or excessive resistance between the IGN SW 1 MAXI-FUSE® in the engine wiring junction block 2 and the ignition switch and/or between the ignition switch and the fuse block. Refer to

    Cell 10: Battery, Fusible Links (SEO), MaxiFuses®: ABS, HD LPS, IGN SW 1, and Fuses: ABS, FAN 3, HORN, PARK LPS


    Object Number: 348742  Size: FS
    Power and Grounding Components
    Cell 10: Fuses 4, 7, 11, 13, 20, 22, 29, 38, and Circuit Breaker C
    Cell 10: Generator, Starter, Fusible Links, MaxiFuse® 1, 2 and4
    Cell 10: Generator, Starter, Fusible Links, MaxiFuse® 1, 2 and4
    Cell 10: Fuses 4, 7, 11, 13, 20, 22, 29, 38, and Circuit Breaker C
    Cell 44: Power, EBCM, Brake Modulator
    Cell 11: ABS, Fan 3, Horn, and Park LPS Fuses
    Cell 18: Passenger Dome Lamp (RPO 6C7) and IGN and Main Power Supply(RPO 6J1)
    in Wiring Systems for schematic.
  2. Make repairs as needed.

Is the action complete?

--

Go to Step 32

--

19

  1. Inspect for a poor connection or an open in the starter harness connector.
  2. Make repairs as needed.

Is the action complete?

--

Go to Step 32

-

20

Refer to Starting System Check in Engine Electrical for further diagnosis of the starter motor and its operation.

Is the action complete?

-

Go to Step 32

-

21

Repair a poor connection or an open in CKT 142.

Has the repair been made?

--

Go to Step 32

--

22

  1. Inspect the ignition switch for proper operation.
  2. Repair as needed. Refer to Ignition Switch Electrical System Does Not Operate in Steering Wheel and Column-Tilt for more information regarding the ignition switch.
  3. Is the action complete?

--

Go to Step 32

--

23

Repair a poor connection or an open in CKT 5.

Has the repair been made?

--

Go to Step 32

--

24

Repair a poor connection or an open in CKT 6.

Has the repair been made?

--

Go to Step 32

--

25

Repair a short to ground in CKT 575 or CKT 806.

Has the repair been made?

--

Go to Step 32

--

26

  1. Inspect the transaxle range switch for proper operation.
  2. Make repairs as needed. Refer to Park/Neutral Position Switch Adjustment in Automatic Transaxle 4T60-E or Park/Neutral Position Switch Adjustment in Automatic Transaxle 4T65-E.

Is the action complete?

--

Go to Step 32

--

27

Repair a poor connection or an open in CKT 806.

Has the repair been made?

--

Go to Step 32

--

28

Repair a poor connection or an open in CKT 575.

Has the repair been made?

--

Go to Step 32

--

29

Repair a poor connection or an open in CKT 625.

Has the repair been made?

--

Go to Step 32

--

30

  1. Inspect the theft deterrent module harness connector for poor terminal contact.
  2. If no problem is found replace the theft deterrent module. Refer to Theft Deterrent Module Replacement .

Has the repair been made?

--

Go to Step 32

--

31

Replace the theft deterrent relay. Refer to Theft Deterrent Relay Replacement .

Has the repair been made?

--

Go to Step 32

--

32

  1. Turn the ignition switch to the LOCK position.
  2. Reconnect the theft deterrent module.
  3. Connect a test light between B+ and the Data Link Connector (DLC) terminal 8.
  4. Turn the ignition switch to the RUN position and observe the test light.

Does the engine start and the test light flash?

--

System OK

Go to Vehicle Theft Deterrent (VTD) System Check