Pinpoint Test I: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

I1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SJB SELF-TEST
- Using the recorded results from the SJB self-test:
- Were any DTCs recorded?
Yes: If DTC B1693 or B1696, GO to I2.

If DTC B1791 or B1793, GO to I4.

All others, REFER to the SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX for correct diagnostics.

No: GO to I4.
I2 CHECK THE MULTIFUNCTION SWITCH
- Key in OFF position.
- Disconnect: Multifunction Switch C2080.
- Key in ON position.
- Repeat the SJB self test.
- Is DTC B1693 or B1696 retrieved again?
Yes: GO to I3.

No: INSTALL a new multifunction switch. REFER to STEERING COLUMN MULTIFUNCTION SWITCH . CLEAR the DTCs. REPEAT the self-test.
I3 CHECK CIRCUIT 1399 (DB/WH) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB 02280e.
- Measure the resistance between the multifunction switch C2080-14, circuit 1399 (DB/WH), harness side and ground.
  
  Fig 1: Checking Circuit 1399 (DB/WH) For A Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes: GO to I8.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
I4 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: Light Sensor C287.
- Measure the resistance between the light sensor C287-B, circuit 570 (BK/WH), harness side and ground.
  
  Fig 2: Checking Circuit 570 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to I5.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
I5 CHECK CIRCUIT 7 (LG/YE) FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280e.
- Key in ON position.
- Measure the voltage between the light sensor C287-C, circuit 7 (LG/YE), harness side and ground.
  
  Fig 3: Checking Circuit 7 (LG/YE) For A Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No: GO to I6.
I6 CHECK CIRCUIT 7 (LG/YE) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the light sensor C287-C, circuit 7 (LG/YE), harness side and the SJB C2280e-2, circuit 7 (LG/YE), harness side.
  
  Fig 4: Checking Circuit 7 (LG/YE) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to I7.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
I7 CHECK THE LIGHT SENSOR
- Connect: SJB C2280e.
- Key in ON position.
- Measure the voltage between the light sensor C287-C, circuit 7 (LG/YE), harness side and ground.
  
  Fig 5: Checking Light Sensor
  Courtesy of FORD MOTOR CO.
- Is the voltage approximately 5 volts?
Yes: INSTALL a new light sensor. REFER to LIGHT SENSOR . CLEAR the DTCs. REPEAT the self-test.

No: GO to I8.
I8 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 SMART JUNCTION BOX (SJB) . 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 the DTCs. REPEAT the self-test.