Pinpoint Test G: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

G1 RETRIEVE THE VEHICLE SECURITY MODULE DIAGNOSTIC TROUBLE CODES (DTCs)
NOTE: Make sure the headlamp switch is in the OFF position.
- Key in OFF position.
- Connect the diagnostic tool.
- Key in ON position.
- Carry out the VSM on-demand self-test.
- Are any DTCs present?
- Yes : If DTC B1695, GO to G2.
  If DTC B1792, GO to G4.
  
  All others, REFER to the VEHICLE SECURITY MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX for correct diagnostics.
- No : GO to G4.
G2 VERIFY DTC B1695
- Key in OFF position.
- Disconnect: Vehicle Security Module C3008b.
- Measure the voltage between vehicle security module C3008b-7, circuit 220 (VT/OG), harness side and ground.
  
  Fig 1: Measuring Voltage Between Vehicle Security Module C3008b-7, Circuit 220 (VT/OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes : GO to G3.
- No : GO to G8.
G3 CHECK CIRCUIT 220 (VT/OG) FOR A SHORT TO POWER
- Disconnect: Headlamp Switch C205a.
- Measure the voltage between the vehicle security module C3008b-7, circuit 220 (VT/OG), harness side and ground.
  
  Fig 2: Measuring Voltage Between Vehicle Security Module C3008b-7, Circuit 220 (VT/OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
G4 CHECK THE LIGHT SENSOR INPUT - MONITOR THE VEHICLE SECURITY MODULE LIGHT SENSOR PID
- Monitor the vehicle security module light sensor PID while illuminating, then removing, the light source from the light sensor.
- Does the PID percentage change with the sensor covered and then illuminated?
- Yes : GO to G8.
- No : GO to G5.
G5 CHECK CIRCUIT 875 (BK/LB) FOR AN OPEN
- Key in OFF position.
- Disconnect: Light Sensor C286.
- Measure the resistance between light sensor C286-5, circuit 875 (BK/LB), harness side and ground.
  
  Fig 3: Measuring Resistance Between Light Sensor C286-5, Circuit 875 (BK/LB), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to G6.
- No : REPAIR the circuit. TEST the system for normal operation
G6 CHECK CIRCUIT 218 (WH/VT) FOR A SHORT TO POWER
- Disconnect: Vehicle Security Module C3008b.
- Key in ON position.
- Measure the voltage between the light sensor C286-2, circuit 218 (WH/VT), harness side and ground.
  
  Fig 4: Measuring Voltage Between Light Sensor C286-2, Circuit 218 (WH/VT), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No : GO to G7.
G7 CHECK CIRCUIT 218 (WH/VT) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between light sensor C286-2, circuit 218 (WH/VT), harness side and vehicle security module C3008b-10, circuit 218 (WH/VT), harness side
  
  Fig 5: Checking Circuit 218 (WH/VT) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new light sensor. REFER to LIGHT SENSOR . TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.
G8 CHECK FOR CORRECT VEHICLE SECURITY MODULE OPERATION
- Disconnect all vehicle security module connectors.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect all vehicle security module 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 vehicle security module. REFER to MULTIFUNCTION ELECTRONIC MODULES -- F150 PICK . TEST the system for normal operation.
- 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.