GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Safari - 2WD 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 SECURITY Indicator Inoperative

Object Number: 381516 Size: LF
Theft Deterrent System Components
Theft Deterrent System Schematics
Ignition Switch, Run, Run/Start, Off/Run/Start Bus
B+ Bus
B+ Bus
Cell 81 Instrument Cluster with Gauges (2 of 5)
GAUGES, AIR BAG Fuses
STOP/HAZ, AUX PWR Fuses
Cell 50 Data Link Connector Pin Assignment
Cell 14 Ground Distribution (5 of 10)
Cell 14 Ground Distribution (4 of 10)
Theft Deterrent System Schematic Icons
Theft Deterrent System Schematic Icons
Theft Deterrent System Schematic Icons

Circuit Description

The Security Indicator Inoperative check is designed to find out the reason the Security indicator is not illuminating. However, the Theft Deterrent System Diagnostic System Check must always be the starting point for all Passlock system troubleshooting.

The diagnostics in this table are designed to troubleshoot non DTC troubles. For example battery power, ignition 1 input, ground, and shorted or open SECURITY indicator circuit.

Diagnostic Aids
    • Perform a visual inspection of the wiring and the connectors.
    •  Refer to Intermittents and Poor Connections .

Test Description

The numbers below refer to the numbers in the diagnostic table.

  1. This step determines if there is power available to the instrument cluster.

    2.

  2. This step tests for continuity in circuit 749.

    3.

  3. This step tests for a short to battery in circuit 749.

    4.

  4. This step tests for an open in circuit 651.

    5.

  5. This step verifies if the gauges fuse randomly opened.

    6.

  6. This step determines if there is a short to ground in the Passlock module.

    7.

  7. This step tests for voltage at the battery side of the Security indicator.

Step

Action

Value(s)

Yes

No

1

Did you perform the Passlock Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2
  1. Ensure that the ignition switch is still in the RUN position.
  2. Observe the instrument cluster.

Is the Brake warning telltale or the Check Gauges telltale on?

--

Go to Step 3

Go to Step 11

3
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the instrument cluster connector. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Test the SECURITY indicator bulb.

Is the bulb open?

--

Go to Step 4

Go to Step 5

4

Replace the SECURITY indicator bulb.

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

--

5
  1. Turn the ignition switch to the LOCK position.
  2. Using the J 39200 , measure the resistance from connector terminal B2 of the Passlock module to terminal A4 of the instrument cluster.

Is the resistance within the specified value?

0-5 ohms

Go to Step 7

Go to Step 6

6

Repair the open in circuit 749.

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

--

7
  1. Disconnect the Passlock module connector. Refer to Theft Deterrent Module Replacement .
  2. Turn the ignition switch to the ON position.
  3. Using the J 39200 , measure the resistance from connector terminal B2 of the Passlock module to ground.

Is the voltage within the specified value?

9-16 V

Go to Step 8

Go to Step 9

8

Repair short to ignition in circuit 749.

Is the repair complete?

--

Go to Step 19

--

9

Using the J 39200 , measure the resistance from connector terminal B1 of the Passlock module to ground.

Is the resistance within the specified value?

0-5 ohms

Go to Step 17

Go to Step 10

10

Repair the open in circuit 651 between connector terminal B1 of the Passlock module and G107.

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

--

11

Test the gauges fuse.

Is the gauges fuse open?

--

Go to Step 12

Go to Step 15

12
  1. Turn the ignition switch to the OFF position.
  2. Replace the gauges fuse.
  3. Turn the ignition switch to the ON position.

Did the gauges fuse open?

--

Go to Step 13

Go to Diagnostic System Check - Theft Deterrent

13
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the Passlock module. Refer to Theft Deterrent Module Replacement .
  3. Replace the gauges fuse.
  4. Turn the ignition switch to the ON position.

Did the gauges fuse open?

--

Go to Step 14

Go to Step 19

14
  1. Repair the short to ground in circuit 39.
  2. Replace the gauges fuse.

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

--

15
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the instrument cluster connector. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Turn the ignition switch to the ON position.
  4. Using the J 39200 , measure voltage from connector terminal B17 of the instrument cluster to ground.

Is the voltage within the specified value?

9-16 V

Go to Step 18

Go to Step 16

16

Repair the open in circuit 39.

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

--

17
  1. Reinstall the Security indicator bulb.
  2. Reconnect the instrument cluster connector.
  3. Connect a fused jumper between terminal B2 of the Passlock module and ground.
  4. Ensure that the ignition switch is still in the ON position.

Did the Security telltale turn on?

--

Go to Step 19

Go to Step 18

18

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

--

19

Replace the Passlock module. Refer to Theft Deterrent Module Replacement .

Is the repair complete?

--

Go to Step 20

--

20
  1. Reconnect all previously disconnected connectors and components.
  2. Ensure that the ignition switch is in the ON position.
  3. Replace any open fuses.
  4. Connect the scan tool.
  5. Clear Passlock DTCs, if any.
  6. Perform one of the following Passlock reprogramming procedures:
    7. • Seed and Key (10 minutes). Refer to PASSLOCK Reprogramming Seed and Key .
    • Auto Learn (30 minutes). Refer to PASSLOCK Reprogramming Auto Learn .

Is the repair complete?

--

Go to Diagnostic System Check - Theft Deterrent

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