Pinpoint Test F: The Speed Control Switch Is Inoperative

F1 CHECK THE SPEED CONTROL SWITCH

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 switch as follows:

RESISTANCE CHECK

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

Fig 1: Measuring Resistance Between Speed Control Actuator C122-5 And Speed Control Actuator C122-6

Courtesy of FORD MOTOR CO.

Are the speed control switch resistance values OK?

Yes : GO to F6.
No : GO to F2 .

F2 CHECK THE SPEED CONTROL SWITCH OPERATION

Deactivate the air bag system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
Disconnect: Horn Switch Wiring Harness.

Measure the resistance between the horn switch wiring harness pin 1, circuit 151 (LB/BK), harness side and the horn switch wiring harness pin 3, circuit 848 (DG/OG), harness side while pressing the switch as follows:

RESISTANCE CHECK

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

Fig 2: Measuring Resistance Between Horn Switch Wiring Harness Pin 1 And Horn Switch Wiring Harness Pin 3

Courtesy of FORD MOTOR CO.

Are the speed control switch resistance values OK?

Yes : GO to F4.
No : GO to F3 .

F3 CHECK THE HORN SWITCH WIRING HARNESS
- 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 . ACTIVATE the air bag system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
- No : REPAIR or INSTALL a new horn switch wiring harness. ACTIVATE the air bag system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
F4 CHECK CIRCUIT 151 (LB/BK) FOR AN OPEN
- 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 And Speed Control Actuator C122-5
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to F5 .
- No : REPAIR the circuit. ACTIVATE the air bag system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
F5 CHECK CIRCUIT 848 (DG/OG) FOR AN OPEN
- 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: Measuring Resistance Between Clockspring C218b-3 And Speed Control Actuator C122-6
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . ACTIVATE the air bag system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
- No : REPAIR the circuit. ACTIVATE the air bag system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
F6 CHECK FOR CORRECT SPEED CONTROL ACTUATOR OPERATION
- 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 . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.