Pinpoint Test E: The High Beam(s) Are Always On

Headlamps

Pinpoint Test E: The High Beam(s) Are Always On

Refer to Wiring Diagram Set 85, Headlamps/Autolamps for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) sends a voltage signal to the multifunction switch for the high beam and flash-to-pass requests. When the multifunction switch is placed in the FLASH-TO-PASS or HIGH BEAM position, the voltage signal is routed to ground. When the SJB (Smart Junction Box) detects a request for flash-to-pass or high beams (when the low beams are on), the SJB (Smart Junction Box) energizes the high beam relay (integrated into the SJB (Smart Junction Box)), which routes voltage to the headlamps.

- DTC B1510 (Flash To Pass Switch Circuit Short to Ground)- an on-demand DTC that sets when the SJB (Smart Junction Box) detects the flash-to-pass request input circuit is short to ground.

- DTC B2A23 (High Beam Input Circuit Short to Ground)- an on-demand DTC that sets when the SJB (Smart Junction Box) detects a short to ground on the high beam request input circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Multifunction switch

- SJB (Smart Junction Box)

PINPOINT TEST E : THE HIGH BEAM(S) ARE ALWAYS ON

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

E1 CHECK FOR DTC B1510 OR DTC B2A23

- Review the DTCs retrieved from the SJB (Smart Junction Box) self-test.

Is DTC B1510 or DTC B2A23 present?

Yes
GO to E2.

No
For Fusion or MKZ, GO to E4.

E2 CHECK THE MULTIFUNCTION SWITCH

- Ignition OFF.

- Disconnect: Multifunction Switch C202.

- Ignition ON.

Do the high beams continue to illuminate?

Yes
GO to E3.

No
INSTALL a new multifunction switch. CLEAR the DTCs. REPEAT the self-test.

E3 CHECK THE HIGH BEAM AND FLASH-TO-PASS REQUEST INPUT CIRCUITS FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280B.

- Measure the resistance between the multifunction switch C202-6, circuit CLF17 (WH/OG), harness side and ground; and between the multifunction switch C202-4, circuit CLF27 (GN/BN), harness side and ground.





Are the resistances greater than 10,000 ohms?

Yes
GO to E5.

No
REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self-test.

E4 CHECK THE SJB (Smart Junction Box) HIGH BEAM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE (FUSION OR MKZ)

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280E.

- Ignition ON.

Do the high beams continue to illuminate?

Yes
REPAIR circuit CLF08 (YE/VT) for a short to voltage. TEST the system for normal operation.

No
GO to E5.

E5 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.