Pinpoint Test H: The AUTOLAMPS Are Inoperative

H1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SMART JUNCTION BOX (SJB) SELF-TEST
- Using the recorded results from the SJB self-test:
- Were any DTCs recorded?
- Yes : If DTC B1693, GO to H2.
  If DTC B1791 or B1793, GO to H6.
  
  All others, REFER to the SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX for correct diagnostics.
- No : GO to H2.
H2 CHECK THE HEADLAMP OPERATION
- Key in ON position.
- Place the headlamp switch to the headlamps ON position while observing the headlamps.
- Do the headlamps illuminate?
- Yes : GO to H3.
- No : REFER to HEADLAMPS to diagnose the headlamps.
H3 CHECK THE MULTIFUNCTION SWITCH
- Key in OFF position.
- Disconnect: Multifunction Switch C2080.
- Carry out the multifunction switch component test. Refer to COMPONENT TESTING article for component testing.
- Is the multifunction switch OK?
- Yes : GO to H4.
- No : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . CLEAR any DTCs. TEST the system for normal operation.
H4 CHECK CIRCUIT 1399 (DB/WH) FOR VOLTAGE
- Key in ON position.
- Measure the voltage between the multifunction switch C2080-14, circuit 1399 (DB/WH), harness side and ground.
  
  Fig 1: Measuring Voltage Between Multifunction Switch C2080-14 Circuit 1399
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to H6.
- No : GO to H5.
H5 CHECK CIRCUIT 1399 (DB/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB C2280e.
- Measure the resistance between the multifunction switch C2080-14, circuit 1399 (DB/WH), harness side and the SJB C2280e-16, circuit 1399 (DB/WH), harness side.
  
  Fig 2: Measuring Resistance Between Multifunction Switch C2080-14 Circuit 1399 (DB/WH), Harness Side And The SJB C2280e-16, Circuit 1399 (DB/WH), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to H8.
- No : REPAIR the circuit. CLEAR any DTCs. TEST the system for normal operation.
H6 CHECK FOR VOLTAGE TO THE LIGHT SENSOR
- Key in OFF position.
- Disconnect: Light Sensor C287.
- Key in ON position.
- Place the headlamp switch to the autolamps position.
- Measure the voltage between the light sensor C287-C, circuit 7 (LG/YE), harness side and ground.
  
  Fig 3: Measuring Voltage Between Light Sensor C287-C Circuit 7 (LG/YE), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage approximately 5 volts?
- Yes : INSTALL a new light sensor. REFER to LIGHT SENSOR . CLEAR any DTCs. TEST the system for normal operation.
- No : GO to H7.
H7 CHECK CIRCUIT 7 (LG/YE) FOR A SHORT TO GROUND
- Disconnect: SJB C2280e.
- Measure the resistance between the light sensor C287-C, circuit 7 (LG/YE), harness side and ground.
  
  Fig 4: Measuring Resistance Between Light Sensor C287-C Circuit 7 (LG/YE), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to H8.
- No : REPAIR the circuit. CLEAR any DTCs. TEST the system for normal operation.
H8 CHECK FOR CORRECT SJB OPERATION
- Key in OFF position.
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . 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. CLEAR any DTCs. REPEAT the self-test.