Pinpoint Test B: Both High Beams Are Inoperative
Headlamps
Pinpoint Tests
Pinpoint Test B: Both High Beams Are Inoperative
Refer to Wiring Diagram Set 85, Headlamps/Autolamps for schematic and connector information. Diagrams By Number
Normal Operation
When the headlamp switch is placed in the HEADLAMPS ON position, the Smart Junction Box (SJB) monitors the high beam request circuit from the multifunction switch through circuit CLF17 (WH/OG). When the multifunction switch is placed in the HIGH BEAM position, the signal is routed to ground through circuit GD116 (BK/VT). The SJB then supplies voltage to the high beam headlamps through circuit CLS08 (VT/GN).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- SJB
PINPOINT TEST B: BOTH HIGH BEAMS ARE INOPERATIVE
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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B1 CHECK THE MULTIFUNCTION SWITCH
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB high beam switch status PID (HBEAMSW) while placing the multifunction switch in the HIGH BEAM position.
- Does the PID indicate the high beam switch is active?
Yes
GO to B5.
No
GO to B2.
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B2 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Carry out the multifunction switch component test.
- Is the multifunction switch OK?
Yes
GO to B3.
No
INSTALL a new multifunction switch. CLEAR the DTCs. REPEAT the self-test.
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B3 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the multifunction switch C202-8, circuit GD116 (BK/VT), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to B4.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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B4 CHECK CIRCUIT CLF17 (WH/OG) FOR AN OPEN
- Disconnect: SJB C2280d.
- Measure the resistance between the multifunction switch C202-6, circuit CLF17 (WH/OG), harness side and the SJB C2280d-15, circuit CLF17 (WH/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to B6.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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B5 CHECK CIRCUIT CLS08 (VT/GN) FOR AN OPEN
- Disconnect: LH Headlamp C1021.
- Disconnect: SJB C2280a.
- Measure the resistance between the LH headlamp C1021-7, circuit CLS08 (VT/GN), harness side and the SJB C2280a-30, circuit CLS08 (VT/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to B6.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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B6 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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