Operation CHARM: Car repair manuals for everyone.
Home >> Audi >> 2007 >> S4 Quattro Sedan (8EC) V8-4.2L (BHF) >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - HVAC >> Control Module HVAC >> Testing and Inspection >> Component Tests and General Diagnostics >> Climatronic Control Module A/C Control Head Electrical Test >> Test Step 6
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)

Or, hide this message: temporarily or permanently

Test Step 6






Test Step 6

Activation of the A/C compressor regulator valve (N280)













• During operation, the compressor output is influenced by the A/C compressor regulator valve (N280).

• The Climatronic control module (J255) A/C control head controls the current flowing over the A/C compressor regulator valve (N280) and thus controls the output of the compressor (read the measured value block, display group "001").
pro multis · About Operation CHARM