For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Install the scan tool.
2. Establish communication with the BCM.
3. Check for any current and/or history and/or intermittent DTCs.

Are there any current and/or history and/or intermittent DTCs present?

--

Go to Step 2

Go to Step 3

2 | Go to Body Control Module to diagnose the problem. Did you complete the repair? | -- | System OK | --
3 |

1. Turn the head lamp switch to the HEAD position.
2. Verify that the low beam headlamps operate properly.

Do the low beam headlamps operate properly when the headlamp switch is turned to the HEAD position?

--

Go to Step 4

Go to Headlamps Inoperative - Low Beams .

4 |

1. Turn ON the high beam headlamps.
2. Verify that the high beam headlamps operate properly.
3. Also verify that the high beam indicator operates properly.

Do the high beam headlamps and the high beam indicator operate properly?

--

Go to Step 6

Go to Step 5

5 |

1. If both of the high beam headlamps are inoperative, go to Headlamps Inoperative - High Beams for diagnosis.
2. If only the LH high beam headlamp is inoperative, go to Headlamps Inoperative - Left High Beam for diagnosis.
3. If only the RH high beam headlamp is inoperative, go to Headlamps Inoperative - Right High Beam for diagnosis.
4. If the high beam indicator is inoperative, go to High Beam Indicator Inoperative for diagnosis.

Did you complete the repair?

--

Go to Step 6

--

6 |

1. Press and release the FLASH-TO-PASS switch.
2. Verify that the FLASH-TO-PASS system operates properly.

Does the FLASH-TO-PASS operate properly?

--

Go to Step 7

Go to Headlamps Flash to Pass Inoperative .

7 |

1. Start the engine.
2. Place the transmission into any gear besides PARK.
3. Verify that the daytime running lamps operate properly.

Do the daytime running lamps operate properly?

--

Go to Step 8

Go to Daytime Running Lamps (DRL) Headlamps Inoperative .

8 |

1. Turn the twilight sentinel switch to the ON position.
2. Use a dark cloth in order to cover the headlamp automatic control ambient light sensor.
3. Verify that the twilight sentinel system operates properly.

Does the twilight sentinel system operate properly?

--

System OK

Go to Twilight Sentinel Inoperative .