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. 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.
NOTE: For vehicles equipped with High Intensity Discharge (HID) headlamps, if the high beam circuit is supplied voltage when the headlamps are not on, the headlamps do not illuminate. The circuit only supplies voltage to activate the high beam shutters within the headlamp assemblies. The low beams must be on for light to illuminate from 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
- Ignition OFF.
- Review the DTCs retrieved from the SJB (Smart Junction Box) self-test.
Was DTC B1510 or DTC B2A23 retrieved?
Yes
GO to E2.
No
For vehicles with halogen headlamps, GO to E4.
For vehicles with HID (High Intensity Discharge) headlamps, GO to E5.
E2 CHECK THE MULTIFUNCTION SWITCH
- 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 E6.
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 (HALOGEN HEADLAMPS)
- 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. CLEAR the DTCs. REPEAT the self-test.
No
GO to E6.
E5 CHECK THE SJB (Smart Junction Box) HIGH BEAM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE (HID (High Intensity Discharge) HEADLAMPS)
NOTE: If only an individual high beam is always on, install a new headlamp assembly. Refer to Headlamp Assembly .
- Ignition OFF.
- Disconnect: LH or RH Headlamp.
- Disconnect: SJB (Smart Junction Box) C2280E.
- Ignition ON.
- Measure the voltage between the LH headlamp C1284-4, circuit CLF08 (YE/VT), harness side and ground; or between the RH headlamp C1285-4, circuit CLF08 (YE/VT), harness side and ground.
Is any voltage present?
Yes
REPAIR circuit CLF08 (YE/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
No
GO to E6.
E6 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.