Anti-theft Immobilizer On Board Diagnostic (OBD)_inst_vw.pdf

Technical Bulletin

Subject:

Anti-theft Immobilizer On Board Diagnostic (OBD)

Group:

99–11

June 25, 1999

Number:

Model(s):

Golf, Jetta, Cabrio, New Beetle

2000

Date:

The anti-theft immobilizer information in this

Technical Bulletin will be integrated into the

Repair Manual (Volkswagen Electronic

Service and Information System) on CD-ROM

at the next update.

Contents

Subject

Technical

Bulletin Page

Repair

Manual Page

Anti-theft immobilizer On Board Diagnostic (OBD)

–

– Immobilizer electronic components and warning light function

–

– Immobilizer On Board Diagnostic, initiating

–

– Diagnostic Trouble Code (DTC) table

–

– Read measured value block

–

– Matching ignition keys

–

– Lost key procedure

–

– Procedure after changing instrument cluster (Matching)

–

– Procedure after changing engine control module (Matching)

–

– Replacement instrument cluster, adaptation

–

– Immobilizer troubleshooting

–

– Emergency start function, activating without VAG 1551

–

1999 Volkswagen of America, Inc.

Anti-theft immobilizer On Board

Diagnostic (OBD)

Immobilizer electronic components and

warning light function

The immobilizer electronics consist of:

control electronics in instrument cluster

a warning light for anti-theft immobilizer sensor -K117- in instru-

ment cluster (speedometer display)

a matched engine control module

an induction coil on the ignition lock

matched ignition keys with electronic components (transponder

and response reader memory)

Malfunction recognition and Diagnostic Trouble Code

(DTC) display via warning light for anti-theft

immobilizer sensor

An intact immobilizer system is indicated by the warning light for

anti-theft immobilizer sensor -K117- lighting up and going out after

approx. 3 seconds when the ignition is switched on.

Warning light flashes or stays lit when the ignition is

switched on (indicates a malfunction in system) if:

the ignition key has been carried out incorrectly.

no transponder (response reader memory) is present in the

ignition key.

An unauthorized ignition key is used.

an unauthorized engine control module is detected.

a malfunction is present in the induction coil of anti-theft immo-

bilizer -D2-.

a malfunction is present in the data wiring.

Warning light does not light up when the ignition is

switched on if:

the immobilizer control module has detected an authorized

key.

the immobilizer control module has not detected an incorrect

engine control module.

the immobilizer control module is currently “matching keys”

and after matching the keys no malfunction has occurred.

To troubleshoot, perform the On Board Diagnostic (OBD) program

and retrieve the stored information with either the VAG 1551/1552

Scan Tool or VAS 5051 Vehicle Diagnostic, Testing and Information

System.

Immobilizer On Board Diagnostic (OBD),

initiating

If malfunctions occur in the sensors and components being moni-

tored, they will be stored in the Diagnostic Trouble Code (DTC)

memory together with an indication of the type of malfunction.

A maximum of 4 DTCs can be stored simultaneously.

Sporadic malfunctions are automatically cancelled if they are not re-

peated in next 50 engine starts.

OBD must be initiated at the commencement of troubleshooting

and the stored information checked with the VAG 1551/1552 Scan

Tool or VAS 5051 Vehicle Diagnostic, Testing and Information Sys-

tem.

Note:

The following description deals only with the VAG 1551Scan Tool.

The information displayed is used in conjunction with a DTC table

which has information on the possible causes for pin-pointed repair

steps.

Connecting VAG 1551 Scan Tool and selecting

functions (Checking control module version)

Checking requirements:

All fuses OK according to wiring diagram

Supply voltage OK (at least 9.0 V).

Connect VAG 1551 using cable VAG 1551/3 as follows:

– Locate Data Link Connector (DLC) under instrument panel.

– Connect cable VAG 1551/3 to DLC

VAG - ON BOARD DIAGNOSTIC

HELP

Indicated on display

1 - Rapid data transfer*

2 - Blink code output*

* Appears alternately

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