Pinpoint Test F: The Speed Control Switch Is Inoperative

• Key in OFF position.
• Disconnect: Speed Control Actuator C122.
• Measure the resistance between the speed control actuator C122-5, circuit 151 (LB/BK), harness side and the speed control actuator C122-6, circuit 848 (DG/OG), harness side while pressing the suspect speed control switch. Use the following table for the speed control switch in question.
  RESISTANCE VALUE
  
  

  Speed Control Switch	Resistance Value
  SET-	Between 108 and 132 ohms
  SET+	Between 646 and 714 ohms
  RES	Between 1,980 and 2,420 ohms
  OFF	Less than 5 ohms

  Fig 1: Measuring Resistance Between Speed Control Actuator C122-5, Circuit 151 (LB/BK), Harness Side And Speed Control Actuator C122-6, Circuit 848 (DG/OG), Harness Side

  Courtesy of FORD MOTOR CO.
• Are the speed control switch resistance values OK? 

Yes 

GO to  F6.

No 

GO to F2.

• Remove the driver air bag. Refer to DRIVER-SIDE AIR BAG MODULE .
• Disconnect: Upper Clockspring.
• Measure the resistance between the upper clockspring-1, circuit 151 (LB/BK), harness side and the upper clockspring-3, circuit 848 (DG/OG), harness side while pressing the switches. Use the following table for the speed control switch in question.
  RESISTANCE VALUE
  
  

  Speed Control Switch	Resistance Value
  SET-	Between 108 and 132 ohms
  SET+	Between 646 and 714 ohms
  RES	Between 1,980 and 2,420 ohms
  OFF	Less than 5 ohms

  Fig 2: Measuring Resistance Between Upper Clockspring-1, Circuit 151 (LB/BK), Harness Side And Upper Clockspring-3, Circuit 848 (DG/OG), Harness Side

  Courtesy of FORD MOTOR CO.
• Are the speed control switch resistance values OK? 

Yes 

GO to  F4.

No 

GO to F3

• Inspect the horn switch wiring harness for shorts, opens or any damage.
• Is the horn switch wiring harness OK? 

Yes 

INSTALL a new speed control switch. Refer to SPEED CONTROL SWITCH - WITH REMOTE AUDIO CONTROLS  or SPEED CONTROL SWITCH - WITHOUT REMOTE AUDIO CONTROLS . INSTALL the driver air bag. Refer to DRIVER-SIDE AIR BAG MODULE .

No 

REPAIR or INSTALL a new horn switch wiring harness. INSTALL the driver air bag. Refer to DRIVER-SIDE AIR BAG MODULE . CLEAR the DTCs. REPEAT the self-test.

• Disconnect: Clockspring C218b.
• Measure the resistance between the clockspring C218b-6, circuit 151 (LB/BK), harness side and the speed control actuator C122-5, circuit 151 (LB/BK), harness side.
  Fig 3: Measuring Resistance Between Clockspring C218B-6, Circuit 151 (LB/BK), Harness Side And Speed Control Actuator C122-5, Circuit 151 (LB/BK), Harness Side

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

Yes 

GO to F5.

No 

REPAIR the circuit. INSTALL the driver air bag. Refer to DRIVER-SIDE AIR BAG MODULE . CLEAR the DTCs. REPEAT the self-test.

• Measure the resistance between the clockspring C218b-3, circuit 848 (DG/OG), harness side and the speed control actuator C122-6, circuit 848 (DG/OG), harness side.
  Fig 4: Checking Circuit 848 (DG/OG) For An Open

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

Yes 

INSTALL a new clockspring. Refer to CLOCKSPRING . INSTALL the driver air bag. Refer to DRIVER-SIDE AIR BAG MODULE . CLEAR the DTCs. REPEAT the self-test.

No  

REPAIR the circuit. INSTALL the driver air bag. Refer to DRIVER-SIDE AIR BAG MODULE . CLEAR the DTCs. REPEAT the self-test.

• Disconnect the speed control actuator connector.
• Check for:
  • corrosion
  • pushed-out pins
• Connect the speed control actuator connector and make sure it seats correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present? 

Yes 

INSTALL a new speed control actuator. Refer to SPEED CONTROL ACTUATOR . CLEAR the DTCs. REPEAT the self-test.

No 

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.