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Home >> Ford >> 2003 >> Excursion 5.4 L, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 406 (HVAC Control System) >> Diagnosis And Testing >> Climate Control System >> Connector Circuit Reference >> Blower Motor Speed Control Module C271
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Blower Motor Speed Control Module C271

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Blower Motor Speed Control Module C271
G03245314Courtesy of FORD MOTOR CO.
BLOWER MOTOR SPEED CONTROL MODULE C271 CIRCUIT REFERENCE

Pin Number (s) Circuit Designation/Description Normal Condition/Measurement
1 CKT 261 (OG/BK) blower motor speed control module to blower motor Greater than 10 volts with the EATC ON.
2 CKT 1205 (BK) blower motor speed control module ground Resistance of 0 ohms to chassis ground.
3 CKT 1120 (BK/WH) EATC module to blower motor speed control module input Less than 1 volt in the lowest blower setting to greater than 4.5 volts in the highest blower setting.
4 CKT 371 (PK/WH) voltage supply to blower motor speed control module Greater than 10 volts with the EATC ON.
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