Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Does the flash to pass function operate properly?

Go to Step 3

Go to Step 6

Test the control circuit of the HDLP HI BM relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 4

Inspect for poor connections at the headlamp dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems

Did you find and correct the condition?

Go to Step 15

Go to Step 5

Replace the headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column-Tilt.

Did you complete the replacement?

Go to Step 15

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1. Turn OFF the ignition.
2. Disconnect the HDLP HI BM relay.
3. Turn ON the ignition with the engine OFF.
4. Turn ON the headlamp switch.
5. Probe the coil side feed circuit of the HDLP HI BM relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 12

1. Connect a test lamp between the coil side feed circuit of the HDLP HI BM relay and the control circuit of the HDLP HI BM relay.
2. Turn ON the headlamps.
3. Move the dimmer switch to the high beam position.

Does the test lamp illuminate?

Go to Step 8

Go to Step 12

Probe the switch side feed circuit of the HDLP HI BM relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 14

Connect a test lamp between the switch side feed circuit of the HDLP HI BM relay and the switch side load circuit of the HDLP HI BM relay.

Does the test lamp illuminate?

Go to Step 10

Go to Step 12

Inspect for poor connections at the HDLP HI BM relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 11

Replace the HDLP HI BM relay. Refer to Headlamp Relay Replacement .

Did you complete the replacement?

Go to Step 15

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Inspect for poor connections at the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 13

Replace the underhood fuse block. Refer to Underhood Fuse Block Replacement in Engine Electrical.

Did you complete the replacement?

Go to Step 15

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Repair the switch side feed circuit of the HDLP HI BM relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2