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MK3 / A70 markets
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Pick a problem area, choose the symptom, then follow the remedy links or step-by-step TSRM procedure.

Diagnostic codes
Searching in 1990 USDM TSRM.
Areas /Theft deterrent D — back door key unlock switch circuit
Step-by-step TSRM procedure

Theft deterrent D — back door key unlock switch circuit

Follow the theft deterrent system flowchart from BE-91.

BE-91
Current check

Is there continuity between terminal 10 and ground with key position normal

Is there continuity between terminal 10 and ground with key position normal?
No

OK

Continue to next check.
Yes

Short circuit in back door key unlock switch circuit.

Short circuit in back door key unlock switch circuit.