For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Inspect the DRL fuse. Is the fuse open? | -- | Go to Step 2 | Go to Step 3
2 | Repair a short to ground in CKT 1839. Is the repair complete? | -- | Go to Exterior Lights System Check | --
3 | Inspect the HVAC/DRL fuse. Is the fuse open? | -- | Go to Step 4 | Go to Step 5
4 | Repair a short to ground in CKT 241. Is the repair complete? | -- | Go to Exterior Lights System Check | --
5 | Check for any diagnostic trouble codes (DTCs). Are there any DTCs present? | -- | Go to Diagnostic System Check - Body Control System in Body Control System | Go to Step 6
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

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
8 | Repair the following conditions in CKT 1839:

• | A faulty connection

• | An open circuit

Is the repair complete?

--

Go to Exterior Lights System Check

--

9 | 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
10 | Repair the following conditions in CKT 241 between S264 and the DRL control module harness connector C2 terminal F:

• | A faulty connection

• | An open circuit

Is the repair complete?

--

Go to Exterior Lights System Check

--

11 | 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
12 | Repair the following conditions in CKT 1450 between the DRL control module and G200:

• | A faulty connection

• | An open

Is the repair complete?

--

Go to Exterior Lights System Check

--

13 | 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
14 |

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

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

--

16 |

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

Is the repair complete?

--

Go to Exterior Lights System Check

--

17 |

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

--

18 | 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
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
20 | Use a J 39200 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
21 | 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 | --
22 | Repair the following conditions in CKT 1137:

• | A faulty connection

• | An open circuit

Is the repair complete?

--

Go to Exterior Lights System Check

--

23 | Use a J 39200 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
24 | Repair the following conditions in CKT 1138:

• | A faulty connection

• | An open circuit

Is the repair complete?

--

Go to Exterior Lights System Check

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