Pinpoint Test F: The High Beams Are Always On
Headlamps
Pinpoint Tests
Pinpoint Test F: The High Beams Are Always On
Refer to Wiring Diagram Set 85, Headlamps/Autolamps for schematic and connector information. Diagrams By Number
Normal Operation
When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the HIGH BEAM position, the SJB sends voltage through circuit CLS08 (VT/GN) to the high beam headlamps.
The SJB sends a reference signal to the multifunction switch through circuits CLF27 (GN/BN) and CLF17 (WH/OG). 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 flash-to-pass or high beams, the SJB sends voltage to the high beam 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 B1570 (Lamp Headlamp High-Beam 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 F: 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.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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F1 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Ignition OFF.
- Check the recorded results from the SJB self-test.
- Is DTC B1510 or B1570 present?
Yes
GO to F2.
No
GO to F4.
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F2 CHECK THE MULTIFUNCTION SWITCH
- Disconnect: Multifunction Switch C202.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Clear the DTCs and repeat the SJB on-demand self-test.
- Is DTC B1510 or B1570 still present?
Yes
GO to F3.
No
INSTALL a new multifunction switch. CLEAR the DTCs. REPEAT the self-test.
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F3 CHECK CIRCUIT CLF17 (WH/OG) (HIGH BEAM) OR CIRCUIT CLF27 (GN/BN) (FLASH-TO-PASS) FOR A SHORT TO GROUND
- Disconnect: SJB C2280d.
- 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 F5.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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F4 CHECK CIRCUIT CLS08 (VT/GN) FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280a.
- Ignition ON.
- Do the headlamps continue to illuminate?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
No
GO to F5.
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F5 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. CLEAR the DTCs. REPEAT the self-test.
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