Front Auxiliary Control C938a

Fig 1: Identifying Front Auxiliary Control C938a Connector Pinouts

Courtesy of FORD MOTOR CO.

FRONT AUXILIARY CONTROL C938A CONNECTOR PINOUTS REFERENCE

Pin Number(s)	Circuit Designation/Description	Normal Condition/Measurement
1	CKT 1131 (LG) front auxiliary controls to rear auxiliary controls	Resistance of 0 ohms to chassis ground with rear auxiliary control in FLOOR mode.
2	CKT 1128 (GY/LB) auxiliary mode door actuator feed	Greater than 10,000 ohms to chassis ground or 0 volts.
3	CKT 1125 (BN) auxiliary temperature blend door actuator return	Approximately 0-5 volts with the ignition on.
4	CKT 1129 (BN/WH) auxiliary mode door actuator return	Greater than 10,000 ohms to chassis ground or 0 volts.
5	CKT 1124 (WH) auxiliary temperature blend door actuator feed	Resistance of 0 ohms to chassis ground with rear auxiliary control in CEILING mode.
7	CKT 276 (BN) front auxiliary controls to rear auxiliary controls	Approximately 4,200 ohms to chassis ground.
8	CKT 1127 (YE) front auxiliary controls to rear auxiliary controls	Approximately 0-4,200 ohms to chassis ground.
9	CKT 1205 (BK) ground	Resistance of 0 ohms to chassis ground.
10	CKT 1003 (GY/YE) voltage in run	Greater than 10 volts with the ignition on.