Pinpoint Test C: One High Beam Headlamp Is Inoperative
Headlamps
Pinpoint Tests
Pinpoint Test C: One High Beam Headlamp Is Inoperative
Refer to Wiring Diagram Set 85, Headlamps/Autolamps for schematic and connector information. Diagrams By Number
Normal Operation
When the Smart Junction Box (SJB) detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the HIGH BEAM position, the SJB energizes an internal relay. When the relay is energized, the relay routes voltage through circuit CLF08 (YE/VT) to the high beams. Ground for the high beams is shared with the low beams.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp assembly
PINPOINT TEST C: ONE HIGH BEAM HEADLAMP IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
-------------------------------------------------
C1 CHECK FOR VOLTAGE TO THE HEADLAMP
- Ignition OFF.
- Disconnect: Inoperative Headlamp.
- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch in the HIGH BEAM position.
- For Sable or Taurus X, measure the voltage between the LH headlamp C1020-1, circuit CLF08 (YE/VT), harness side and ground; or between the RH headlamp C1040-1, circuit CLF08 (YE/VT), harness side and ground.
- For Taurus, measure the voltage between the LH headlamp C1284-7, circuit CLF08 (YE/VT), harness side and ground; or between the RH headlamp C1285-7, circuit CLF08 (YE/VT), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
For Taurus, REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly Service and Repair. TEST the system for normal operation.
For Sable or Taurus X, REPAIR circuit GD120 (BK/GN) (LH) or circuit GD123 (BK/GY) (RH) for an open. TEST the system for normal operation.
No
REPAIR the circuit CLF08 (YE/VT) for an open. TEST the system for normal operation.
-------------------------------------------------