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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Seville 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 DTC B3028 Starter Relay Interface Short to Ground

Refer to Theft Deterrent System Schematics

Cell 133: PASS-Key


Object Number: 361993 Size: FS
Theft Deterrent System Components
Vehicle Theft Deterrent (VTD) Description
Cell 133: CTD Door Switch Inputs
Cell 10: IGN, SW, HTDST LR, HTDST RR, and HTDST RF Fuses
Cell 10: PCM BATT, EXPORT BRK, IP, ABS SOL, and ABS MOT Fuses
Cell 10: START Circuit Breaker and ACC, WSW Fuses
Cell 10: Ignition Switch
Cell 30: Starter Solenoid Controls
Cell 50: Class 2 Serial Data Line (LH Drive)
Cell 14: G201 (1 of 3)
Handling ESD Sensitive Parts Notice
Cell 14: G201 (1 of 3)

Circuit Description

The Theft Deterrent (VTD) Module controls the starter relays at connector terminal G, CKT 625 (YEL/BLK). The VTD module monitors this output to determine if it is within a valid operating range.

Conditions for Setting the DTC

The VTD module detects that CKT 625 (YEL/BLK) is shorted to ground for approximately 1.2 seconds or more.

Action Taken When the DTC Sets
    • Stores a DTC B3028 in the VTD module memory.
    • No driver warning message will be displayed for this DTC.

Conditions for Clearing the DTC
    • The VTD module detects that CKT 625 (YEL/BLK) is no longer shorted to ground for approximately 1.2 seconds or more.
    • A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
    • Use the On-Boards clearing DTCs feature.
    • Use a scan tool.

Diagnostic Aids

Check circuit 625 (YEL/BLK) for a short to ground.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. Perform the Theft Deterrent System Diagnostic System Check before continuing with the diagnosis of this DTC.

    2.

  2. Determines whether the malfunction is in the underhood fuse block.

    3.

  3. Determines whether the malfunction is in the circuit or the VTD module.

    4.

  4. Clear all DTCs after the repair procedure is complete.

DTC B3028 Starter Relay Interface Short to Ground

Step

Action

Value(s)

Yes

No

1

Was the Theft Deterrent System Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2

  1. Remove the key from the ignition switch.
  2. Disconnect the underhood fuse block connector C2.
  3. Connect a digital multimeter (DMM) between the underhood fuse block connector C2, terminal A2 and ground.

Is the resistance within the specified range?

0-5 ohms

Go to Step 3

Go to Step 6

3

  1. Disconnect the VTD module connector.
  2. Connect a DMM between the connector terminal G, CKT 625 and ground.

Is the resistance within the specified range?

0-5 ohms

Go to Step 5

Go to Step 4

4

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

Is the replacement complete?

--

Go to Step 7

--

5

Repair the short to ground in circuit 625 (YEL/BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 7

--

6

Replace the underhood fuse block. Refer to Underhood Fuse Block Replacement in Engine Electrical.

Is the replacement complete?

--

Go to Step 7

--

7

  1. Turn OFF the ignition.
  2. Reconnect or install any connectors or components that were disconnected or removed.
  3. Turn ON the ignition.
  4. Clear any DTCs. Refer to Clearing DTCs .

Are all DTCs cleared?

--

Go to Diagnostic System Check - Theft Deterrent

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