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

Connector End View Reference: Lighting Systems Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Verify that the daytime running lamps (DRL) headlamps are inoperative.

Do the DRL headlamps operate normally?

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

Go to Step 3

Use the scan tool to inspect for the following related body control module (BCM) Data/Input Parameters and Output Controls. Refer to Scan Tool Data List for typical values and definitions:

Did you find and correct a condition?

Go to Step 10

Go to Step 4

Turn the headlamp switch to the HEAD position.

Do the headlamps operate properly in the LO position?

Go to Step 5

Go to Headlamps Inoperative - Low Beams

Place the multifuncton headlamp dimmer switch in the HI position.

Do the headlamps operate properly in the HI position?

Go to Step 6

Go to Headlamps Inoperative - High Beams

Place the fog lamp switch in the ON position.

Do the fog lamps operate properly?

Go to Step 7

Go to Fog Lamps Inoperative

1. With the key in RUN, engine OFF, and the Headlamp Switch in the AUTO position, remove the DRL relay from the underhood fuse block.
2. Use a DMM to check for continuity to ground from the DRL relay control circuit terminal at the DRL relay connector in the underhood fuse block. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

Go to Step 9

Go to Step 8

Repair the open or high resistance in the DRL relay control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

--

Replace the DRL relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the repair?

Go to Step 10

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

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

Connector End View Reference: Lighting Systems Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Verify that the daytime running lamps (DRL) headlamps are inoperative.

Do the DRL headlamps operate normally?

--

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

Go to Step 3

Use the scan tool to inspect for the following related Body Control Module (BCM) Data/Input parameters and Output controls. Refer to Scan Tool Data List for typical values and definitions:

Did you find and correct a condition?

--

Go to Step 13

Go to Step 4

Turn the headlamp switch to the HEAD position.

Do the low beam headlamps operate properly?

--

Go to Step 5

Go to Headlamps Inoperative - Low Beams

1. With the key in RUN and engine OFF, remove the DRL relay (ZR2).
2. Use a DMM to check for voltage at the DRL relay coil battery positive voltage supply terminal of the DRL relay connector. Refer to Circuit Testing in Wiring Systems.

Is the specified voltage present?

B+

Go to Step 7

Go to Step 6

Test for an open, high resistance, or short to ground in the Ignition 1 voltage circuit. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

--

Go to Step 9

Go to Step 12

With the headlamp switch in the AUTO position, use the DMM to check for continuity to ground at the DRL relay coil control circuit terminal at the DRL relay connector. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

--

Go to Step 8

Go to Step 10

1. Reinstall the DRL (ZR2) relay.
2. With the headlamp switch in the HEAD position and the multifunction headlamp dimmer switch in LO beam, use the DMM to backprobe for continuity to ground from the DRL relay headlamp dimmer switch low beam signal circuit terminal at the DRL relay connector. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

--

Go to Step 12

Go to Step 11

Repair the open, high resistance, or short to ground in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 13

--

Repair the open or high resistance in the DRL relay control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 13

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Repair the open or high resistance in the headlamp dimmer switch low beam signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 13

--

Replace the DRL relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the repair?

--

Go to Step 13

--

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3