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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Poor Radio Reception/Interference



Poor Radio Reception/Interference






Fault Symptom
Poor radio reception/interference.

Conditions
Ignition ON.
IHU activated.
Radio reception.

Diagnostic Help
Finding a mechanical or electrical fault.

Checking The Wiring Harness
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits in the wiring harness. Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.