Operation CHARM: Car repair manuals for everyone.
Home >> Jeep >> 2004 >> Grand Cherokee 4WD V8-4.7L VIN J >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Heating & A/C System >> Blower Motor Always Runs At One Speed Only (AZC)
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

Blower Motor Always Runs At One Speed Only (AZC)

Test 1 - 3:




Test 4:






SYMPTOM
BLOWER MOTOR ALWAYS RUNS AT ONE SPEED ONLY (AZC)

POSSIBLE CAUSES
- Blower motor control CKT shorted to ground
- Blower motor control circuit shorted to blower motor high driver circuit
- AZC module, fan stuck on one speed only
- Blower motor controller
pro multis · About Operation CHARM