2003 Nissan Pathfinder SE
Fan Control Amplifier
The fan control amplifier is located on the cooling unit. The fan control amp. receives a gate voltage from the auto amp. to step-lessly maintain the blower fan motor voltage in the 5 to 12 volt range (approx.).
Fig. 169: Identifying Fan Control Amplifier
DIAGNOSTIC PROCEDURE
SYMPTOM: Blower motor operation is malfunctioning under Starting Fan Speed Control.
1. CHECK POWER SUPPLY FOR FAN CONTROL AMP.
Disconnect fan control amp. harness connector.
Do approx. 12 volts exist between fan control amp. harness connector terminal No. 3 and body ground?
2. CHECK BODY GROUND CIRCUIT FOR FAN CONTROL AMP.
Does continuity exist between fan control amp. harness connector terminal No. 1 and body ground?
3. CHECK VOLTAGE FOR FAN CONTROL AMP.
Set up Self-diagnosis STEP 4.
Measure voltage across fan control amp. harness connector terminal No. 2 and body ground. Download File PDF
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