Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Test A: No Communication With The Vehicle Security Module

PINPOINT TESTS A: NO COMMUNICATION WITH THE VEHICLE SECURITY MODULE


A1-A2:






Normal Operation
The vehicle security module receives voltage on circuits 456 (DG/OG) and 645 (WH/LB), and ground on circuit 1205 (BK).

Possible Causes
- circuit 1205 (BK) open
- circuit 456 (DG/OG) open or short to ground
- circuit 645 (WH/LB) open or short to ground
- vehicle security module