Pinpoint Test D: The Steering Wheel Control Switch Illumination Source Is Inoperative

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector(s).

D1 CHECK CIRCUIT 1417 (LG/RD) FOR AN OPEN
- Depower the supplemental restraint system (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: Clockspring C218b.
- Disconnect: Smart Junction Box (SJB) C2280b.
- Measure the resistance between the clockspring C218b-5, circuit 1417 (LG/RD), harness side and the SJB C2280b-10, circuit 1417 (LG/RD), harness side.
  
  Fig 1: Checking Circuit 1417 (LG/RD) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to D2.

No : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
D2 CHECK CIRCUIT 1205 (BK) FOR GROUND
- Measure the resistance between the clockspring C218b-1, circuit 1205 (BK), harness side and ground.
  
  Fig 2: Checking Circuit 1205 (BK) For Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to D3.

No : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
D3 CHECK THE CLOCKSPRING FOR VOLTAGE
- Remove the driver airbag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: Upper Clockspring.
- Measure the resistance between the clockspring C218b, pin 4, component side and the upper clockspring connector pin 5, component side; and between the clockspring C218b pin 1, component side and the upper clockspring connector pin 5 component side.
  
  Fig 3: Checking Clockspring For Voltage
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes : GO to D4.

No : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.

D4 CHECK THE STEERING WHEEL CONTROL SWITCH HARNESS

Disconnect: Steering Wheel Speed Control Switches C203.
Disconnect: Steering Wheel Audio Switch C2111.

Measure the resistances between the upper clockspring connector, harness side and the steering wheel control switches, harness side; and between the upper clockspring connector, harness side and the audio control switch, harness side as follows:

CLOCKSPRING & STEERING WHEEL CONTROL SWITCHES CONNECTOR-PINOUTS REFERENCE

Switch Function	Upper Clockspring Connector Pin	Switch Connector-Pin
Speed Control Switches	4	C203-4
Speed Control Switches	5	C203-5
Audio Control Switch	4	C2111-1
Audio Control Switch	5	C2111-2

Are the resistances less than 5 ohms?

Yes : INSTALL a new steering wheel control switch. For the audio control switch, REFER to INFORMATION AND ENTERTAINMENT SYSTEM . For the speed control switches, REFER to SPEED CONTROL . INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.

No : REPAIR or INSTALL a new steering wheel control switch harness. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.