Pinpoint Test E: One High Beam Headlamp Is Inoperative
Headlamps
Pinpoint Tests
Pinpoint Test E: One High Beam Headlamp Is Inoperative
Refer to Wiring Diagram Set 85, Headlamps for schematic and connector information. Diagrams By Number
Normal Operation
When the high beam relay is energized, voltage is provided from the Bussed Electrical Center (BEC) through circuits 1337 (VT/YE) and 1335 (YE/WH) to the LH and RH headlamps.
Vehicles equipped with High Intensity Discharge (HID) headlamps utilize a shutter within the headlamp assembly to increase the beam pattern.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp assembly
- BEC
PINPOINT TEST E: ONE HIGH BEAM HEADLAMP IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: For halogen headlamps, make sure the bulb is good before continuing diagnostics.
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E1 CHECK THE LOW BEAMS
- Ignition OFF.
- NOTE: Make sure the multifunction switch is in the LOW BEAM position.
- Place the headlamp switch in the HEADLAMPS ON position.
- Does the low beam illuminate in the headlamp in question?
Yes
For HID headlamps, GO to E2.
For halogen headlamps, GO to E3.
No
For halogen headlamps, Go To Pinpoint Test C. Pinpoint Test C: One Low Beam Headlamp Is Inoperative - Halogen Headlamps
For HID headlamps, Go To Pinpoint Test D. Pinpoint Test D: One Low Beam Headlamp Is Inoperative - High Intensity Discharge (HID) Headlamps
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E2 CHECK CIRCUIT 1335 (YE/WH) OR CIRCUIT 1337 (VT/YE) FOR VOLTAGE
- Disconnect: Inoperative Headlamp.
- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch is in the HIGH BEAM position.
- Measure the voltage between the LH headlamp C1284-3, circuit 1337 (VT/YE), harness side and ground; or between the RH headlamp C1285-3, circuit 1335 (YE/WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly Service and Repair. TEST the system for normal operation.
No
GO to E3.
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E3 CHECK CIRCUIT 1335 (YE/WH) OR CIRCUIT 1337 (VT/YE) FOR AN OPEN
- Place the headlamp switch in the OFF position.
- Disconnect: Inoperative Headlamp.
- Disconnect: BEC C1035c.
- Measure the resistance between the LH headlamp C1021-3 or C1284-3, circuit 1337 (VT/YE), harness side and the BEC C1035c-F6, circuit 1337 (VT/YE), harness side; or between the RH headlamp C1041-3 or C1285-3, circuit 1335 (YE/WH), harness side and the BEC C1035c-F7, circuit 1335 (YE/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new BEC. TEST the system for normal operation.
No
REPAIR the circuit in question. TEST the system for normal operation.
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