Constant Control Relay Module

Fig 1: Identifying Constant Control Relay Module

Courtesy of FORD MOTOR CO.

The constant control relay module uses a combination of relays and solid state switches to control the following systems:

• engine cooling fan
• A/C clutch
• fuel pump
• powertrain control module power

The powertrain control module can interrupt A/C compressor operation through the constant control relay module under the following conditions:

• during engine start-up
• wide open throttle (WOT)
• low engine idle conditions
• excessively high engine temperatures