Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Place the ignition in the ON position, with the engine OFF.
2. Place the headlamp switch in the HEADLAMP position.
3. Place the headlamp dimmer switch in the LOW BEAM position.

Do the low beam headlamps illuminate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Are both low beam headlamps inoperative?

Go to Step 7

Go to Step 4

1. Disconnect the forward lamp harness connector of the headlamp ballast.
2. Connect a test lamp between the supply voltage circuit of the headlamp ballast and a ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

Connect a test lamp between the supply voltage circuit of the headlamp ballast and the ground circuit of the headlamp ballast.

Does the test lamp illuminate?

Go to Step 18

Go to Step 20

Test for a poor connection, open or a short to ground in the low beam headlamp ballast voltage supply circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

1. Place the ignition in the ON position, with the engine OFF.
2. With a scan tool, observe the Headlamp ON Switch parameter in the Body Control Module (BCM) Data Display.

Does the scan tool indicate that the Headlamp Low Switch parameter is active?

Go to Step 8

Go to Step 14

With the a scan tool, observe the Headlamp OFF Switch parameter in the BCM Data Display.

Does the scan tool indicate the headlamp OFF switch is ON?

Go to Step 9

Go to Step 13

1. Turn the ignition to the OFF position.
2. Remove the low beam relay.
3. Place the ignition to the ON position, with the engine OFF.

Connect a test lamp between the supply voltage circuit of the low beam relay coil and ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 25

1. Connect a test lamp between the coil supply voltage circuit of the low beam relay and the headlamp low beam relay control circuit.
2. Turn the headlamp switch to the HEAD position.

Does the test lamp turn ON and OFF with each command?

Go to Step 11

Go to Step 16

1. Place the ignition to the OFF position.
2. Connect a test lamp between the switched supply voltage circuit of the low beam relay and ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 25

Connect a 20-amp fused jumper between the battery positive voltage supply circuit of the low beam relay switch and the switched supply voltage circuit of the low beam headlamp ballasts.

Do the low beam headlamps illuminate?

Go to Step 23

Go to Step 21

Test for a short to ground in the headlamp switch OFF signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 22

Test for an open, high resistance, or a short to battery positive voltage in the headlamps ON signal circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 15

Test for an open or high resistance in the ground circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 17

Test for an open, high resistance or short to battery positive voltage in the headlamp low beam relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 19

Inspect for poor connections at the headlamp 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 27

Go to Step 22

Inspect for poor connections at the appropriate headlamp ballast. 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 27

Go to Step 24

Inspect for poor connections at the BCM. 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 27

Go to Step 26

Repair an open, high resistance, or short to battery positive voltage in the ground circuit of the headlamp ballast. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

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Repair a short to ground in the switched supply voltage circuit of the low beams. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

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Replace the multifunction switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 27

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Replace the low beam relay. Refer to Relay Replacement in Wiring Systems.

Do the low beam headlamps operate normally?

Go to Step 27

Go to Step 25

Important!: Make sure that the headlamp ballast connector retaining clip is fully installed on the Philips system, otherwise the ballast will not operate. All Delphi and Philips components are NOT interchangeable.

Replace the appropriate headlamp ballast. Refer to High Intensity Discharge Headlamp Ballast Replacement .

Did you complete the repair?

Go to Step 27

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Replace the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 27

--

Important:: Perform the setup procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integration Systems.

Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems.

Did you complete the replacement?

Go to Step 27

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2