Golf GL L4-2.0L (AZG) (2001)
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Alarm Module: Component Tests and General Diagnostics
Anti-theft Immobilizer, Troubleshooting
Requirements
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Voltage supply OK.
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Diagnostic wire between instrument cluster and VAG-1551 OK.
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Valid wiring diagram and Repair Manual available.
Malfunction
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Engine does not start (when starting, engine runs and stalls after approx. 1 second)
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Connect VAG 1551 and initiate On Board Diagnostic (OBD).
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Select engine control module with address word 01.
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Check DTC memory (function 02).
Possible cause
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DTC 17978 -"Engine control module blocked" is stored in DTC memory
The immobilizer control module electronics have not released the engine control module!
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Erase DTC memory (function 05) and end output (function 06).
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Select instrument cluster OBD with address word 17.
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Check DTC memory (function 02), evaluate and correct malfunctions using DTC table. See: Reading and Clearing Diagnostic Trouble
Codes/Displaying and Reading Trouble Codes/With Manufacturer Scan Tool
NOTE: After completing the repairs and adapting the immobilizer components it is absolutely necessary that the engine control module DTC memory is
checked and erased.
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DTC 17978 "Engine control module blocked" is not stored in DTC memory, this means:
There is no malfunction of the electronic immobilizer!
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Perform troubleshooting according to instructions.
Malfunction
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Key adaptation faulty
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DTC 01179 "Key programming faulty" is stored in DTC memory of immobilizer control module
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Select instrument cluster OBD with address word 17.
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Press -> button.
Indicated on display (example)
IMMO-IDENT No.: VWZ7ZOV0066808 ->
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Compare 14-digit identification number shown in display with identification number on key fob.
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If identification numbers are different, determine secret number corresponding to immobilizer identification number in display. The correct secret
number must be requested from the corporate radio/immobilizer code retrieval system by supplying the 14-character immobilizer identification
number.
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Adapt all keys with correct secret number.
Malfunction
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"Fail" appears in odometer display in instrument cluster and engine does not start
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An incorrect secret number has been entered 3 times
Corrective measure
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Perform "Login procedure" function 11.