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 X

PINPOINT TEST X: THE REVERSING LAMPS ARE ON CONTINUOUSLY


Test X1:






Normal Operation
Switched battery voltage is normally provided to the digital transmission (TR) sensor through circuit 1087 (OG). When the transmission is placed into reverse, the digital TR sensor transfers power to circuit 140 (BK/PK) which provides power to the reversing lamps. Ground is provided to each lamp individually through circuit 1205 (BK).

Possible Causes
- circuit 140 (BK/PK) short to power
- digital TR sensor