Pinpoint Test C: The Headlamp On Reminder Chime Is Inoperative

C1 CHECK CIRCUIT 29S-LE18 (OG/YE) FOR VOLTAGE
- Key in OFF position.
- Disconnect: GEM C201d.
- Place the headlamp switch in the parking lamps ON position.
- Measure the voltage between the GEM C201d pin 14, circuit 29S-LE18 (OG/YE), harness side and ground.
  
  Fig 1: Measuring Voltage Between GEM C201d Pin 14, Circuit 29S-LE18 (OG/YE), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to C3.
  - No : GO to C2.
C2 CHECK CIRCUIT 29S-LE18 (OG/YE) FOR AN OPEN
- Disconnect: Headlamp Switch C205.
- Measure the resistance between the GEM C201d pin 14, circuit 29S-LE18 (OG/YE), harness side and the headlamp switch C205 pin 16, circuit 29S-LE18 (OG/YE), harness side and ground.
  
  Fig 2: Checking Circuit 29S-LE18 (OG/YE) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
  - Yes : INSTALL a new headlamp switch. REFER to EXTERIOR LIGHTING . TEST The system for normal operation.
  - No : REPAIR the circuit. TEST the system for normal operation.
C3 CHECK FOR CORRECT GEM OPERATION
- Disconnect all the GEM connections.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect all the GEM 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 GEM. 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 the DTCs. TEST the system for normal operation.