Inspect the DRL fuse.

Is the fuse open?

--

Go to Step 2

Go to Step 3

Repair a short to ground in CKT 1839.

Is the repair complete?

--

Go to Exterior Lights System Check

--

Inspect the HVAC/DRL fuse.

Is the fuse open?

--

Go to Step 4

Go to Step 5

Repair a short to ground in CKT 241.

Is the repair complete?

--

Go to Exterior Lights System Check

--

Check for any diagnostic trouble codes (DTCs).

Are there any DTCs present?

--

Go to Diagnostic System Check - Body Control System

Go to Step 6

1. Turn the ignition to the RUN position.
2. Release the park brake.
3. Apply a bright light to the DRL ambient light sensor.

Do the front turn signal lamps light?

--

Go to Step 18

Go to Step 7

Use a test lamp in order to backprobe between the DRL control module harness connector C2 terminal C and ground.

Did the test lamp light?

--

Go to Step 9

Go to Step 8

Repair the following conditions in CKT 1839:

Is the repair complete?

--

Go to Exterior Lights System Check

--

Use a test lamp in order to backprobe between the DRL control module harness connector C2 terminal F and ground.

Did the test lamp light?

--

Go to Step 11

Go to Step 10

Repair the following conditions in CKT 241 between S264 and the DRL control module harness connector C2 terminal F:

Is the repair complete?

--

Go to Exterior Lights System Check

--

Use a test lamp in order to backprobe between the DRL control module harness connector C2 terminal C and terminal A.

Did the test lamp light?

--

Go to Step 13

Go to Step 12

Repair the following conditions in CKT 1450 between the DRL control module and G200:

Is the repair complete?

--

Go to Exterior Lights System Check

--

Use a test lamp in order to backprobe between B+ and the DRL control module harness connector  C2 terminal E.

Did the test lamp light?

--

Go to Step 14

Go to Step 17

1. Disconnect the parking brake indicator switch.
2. Use a test lamp in order to backprobe between B+ and the DRL control module harness connector C2 terminal E.

Did the test lamp light?

--

Go to Step 16

Go to Step 15

1. Adjust or replace the parking brake indicator switch. Refer to Parking Brake Indicator Switch Replacement in Park Brake.
2. Inspect the system.

Is the repair complete?

--

Go to Exterior Lights System Check

--

1. Repair a short to ground in CKT 1134.
2. Inspect the system.

Is the repair complete?

--

Go to Exterior Lights System Check

--

1. Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .
2. Inspect the system.

Is the repair complete?

--

Go to Exterior Lights System Check

--

Cover the DRL ambient light sensor.

Does the low beam headlamps and the park lamps turn on, and the turn signal lamps turn off?

--

Go to Step 17

Go to Step 19

Disconnect the DRL ambient light sensor.

Do the low beam headlamps and park lamps turn on?

--

Go to Step 21

Go to Step 20

Use a digital multimeter (DMM) in order to verify continuity in CKT 1137 between the DRL ambient light sensor harness connector terminal B and the DRL control module harness connector C2 terminal G.

Is there continuity in CKT 1137?

--

Go to Step 23

Go to Step 22

Replace the DRL ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement .

Is the repair complete?

--

Go to Exterior Lights System Check

--

Repair the following conditions in CKT 1137:

Is the repair complete?

--

Go to Exterior Lights System Check

--

Use a DMM in order to verify continuity in CKT 1138 between the DRL ambient light senor harness connector terminal A and the DRL control module harness connector C2 terminal H.

Is there continuity in CKT 1138?

--

Go to Step 17

Go to Step 24

Repair the following conditions in CKT 1138:

Is the repair complete?

--

Go to Exterior Lights System Check

--

1. Turn the ignition switch to RUN.
2. Using a test lamp, backprobe the DRL control module connector C2 terminal F to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 2

Repair the following conditions in CKT 241:

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

Using a test lamp, backprobe the DRL control module connector C2 terminal F to terminal B.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

Repair the following conditions in CKT 1450 between the DRL control module connector C2 terminal B and S230:

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

Using a test lamp, backprobe the DRL control module connector C1 terminal D to terminal B.

Does the test lamp light?

--

Go to Step 7

Go to Step 6

Repair the following conditions in CKT 2340:

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

Start the engine, allow to idle.

Is the LOW OIL Indicator ON?

--

Go to Step 8

Go to Step 9

Inspect for a short to ground in CKT 31.

If OK, replace the engine oil pressure indicator switch.

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

Using a test lamp, backprobe the DRL control module connector C1 terminal E to ground.

Does the test lamp light?

--

Go to Step 11

Go to Step 10

Replace the DRL control module.

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

Repair the following conditions in CKT 12 between S261 and the DRL control module connector C1 terminal E:

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--