GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 DTC 🢒 DTC B2955 Security System Sensor Data CKT Malf

Refer to one of the following Theft Deterrent System Schematics:

    • 

PASS-Key LHD
Object Number: 575983 Size: FS
IGN SW, HTDST LR, HTDST RR, and HTDST RF Fuses
Ignition Switch
Ignition Switch
Ignition Switch
Starter Solenoid Control
Class 2 Serial Data Line (LH Drive)
Pass-Key RHD
Theft Deterrent System Components
Vehicle Theft Deterrent (VTD)Circuit Description
Start Circuit Breaker and ACC, WSW Fuses
Start Circuit Breaker and ACC, WSW Fuses
Start Circuit Breaker and ACC, WSW Fuses
G201 (Partial)
    • 

Pass-Key RHD
Object Number: 594066 Size: FS
IGN SW, HTDST LR, HTDST RR, and HTDST RF Fuses
Ignition Switch
Ignition Switch
Starter Solenoid Control
Theft Deterrent System Components
Vehicle Theft Deterrent (VTD)Circuit Description
PASS-Key LHD
Class 2 Serial Data Line (LH Drive)
PCM BATT, EXPORT BRK, IP, ABS Sol, and ABS MOT Fuses
Start Circuit Breaker and ACC, WSW Fuses
Start Circuit Breaker and ACC, WSW Fuses
G201 (Partial)
G201 (Partial)

Circuit Description

Theft Deterrent (VTD) Module monitors the key code terminal B, CKT 1836 (YEL). The VTD module monitors this input to determine if it is within a valid operating range.

Conditions for Setting the DTC

Theft Deterrent (VTD) Module has set DTC B3055 current and has detected that CKT 1836 (YEL) is shorted to battery for approximately 1 seconds or more.

Action Taken When the DTC Sets
    • Stores a DTC B2955 in the VTD module memory.
    • SERVICE THEFT SYSTEM driver warning message will be displayed for this DTC.
    • The Security Indicator is illuminated.

Conditions for Clearing the DTC
    • Theft Deterrent (VTD) Module detects that CKT 1836 (YEL) is no longer shorted to battery for approximately 1 seconds or more.
    • Use the On-Boards clearing DTCs feature.
    • Use a scan tool.

Diagnostic Aids

Check CKT 1836 (YEL) for a short to battery or an open.

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 VTD module.

    3.

  3. Determines whether the malfunction is in the circuit or the reader exciter.

    4.

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

DTC B2955

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. Ignition switch OFF.
  2. Disconnect the VTD module connector.
  3. Connect a DMM between the connector terminal B, CKT 1836 and ground.
  4. Ignition switch ON.

Is the voltage greater than the specified value?

9 volt

Go to Step 4

Go to Step 3

3

  1. Ignition switch OFF.
  2. Disconnect the reader exciter.
  3. Ignition switch ON.

Is the voltage greater than the specified value?

9 volt

Go to Step 5

Go to Step 6

4

Replace the Theft Deterrent (VTD) Module. Refer to Theft Deterrent Module Replacement .

Is the replacement complete?

--

Go to Step 7

--

5

Repair the short to battery in circuit 1836 (YEL). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 7

--

6

Replace the reader exciter. Refer to Reader/Exciter Replacement .

Is the replacement complete?

--

Go to Step 7

--

7

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

Are all DTCs cleared?

--

Go to Diagnostic System Check - Theft Deterrent

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