Pinpoint Test E: The High Beams Are Always On

Headlamps

Pinpoint Tests

Pinpoint Test E: The High Beams Are Always On

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

Normal Operation

The Smart Junction Box (SJB) sends a voltage signal to the multifunction switch through the flash-to-pass and high beam request circuits. 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 detects a request for high beams (when the low beams are on) or flash-to-pass, the SJB energizes the high beam relay (integrated into the SJB), which routes voltage through the headlamp voltage supply circuit to the headlamps.

- DTC B1510 (Flash to Pass Switch Circuit Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the flash-to-pass request input circuit.
- DTC B2A23 (High Beam Input Circuit Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the high beam request input circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Multifunction switch
- SJB



PINPOINT TEST E: THE HIGH BEAMS 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.

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E1 CHECK FOR MULTIFUNCTION INPUT DTCs


- Review the DTCs recorded from the SJB self-test.
- Was DTC B1510 or DTC B2A23 retrieved?

Yes
GO to E2.

No
GO to E4.

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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. REFER to Steering Column. CLEAR the DTCs. REPEAT the self-test.

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


- Ignition OFF.
- Disconnect: SJB 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.

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E4 CHECK THE SJB HIGH BEAM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: SJB C2280e.
- 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.

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E5 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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. REFER to Body Control Systems. 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.

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