For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Headlight Diagnostic System Check? | -- | Go to Step 2 | Go to Headlight System Check .
2 |

1. Disconnect the BCM connector C1.
2. Press and hold the Flash-to-Pass switch.
3. Use the DMM in order to measure the voltage between terminal A4 of the BCM connector C1 and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 3

Go to Step 4

3 | Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the repair? | -- | Go to Step 9 | --
4 |

1. Disconnect the turn signal switch connector.
2. Use the DMM in order to measure the resistance between terminal 2 of the turn signal switch connector and terminal A4 of the BCM connector C1.

Is the measured resistance within the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

5 |

1. Locate an open or a high resistance in circuits M3 and/or M50.
2. Repair the open or the high resistance in circuits M3 and/or M50.

Did you complete the repair?

--

Go to Step 9

--

6 | Use the DMM in order to measure the voltage between terminal 5 of the turn signal switch connector and a known good ground. Is the measured voltage within the specified value? | B+ | Go to Step 8 | Go to Step 7
7 |

1. Locate an open or a high resistance in circuit A8.
2. Repair the open or the high resistance in circuit A8.

Did you complete the repair?

--

Go to Step 9

--

8 | Replace the turn signal switch. Refer to Turn Signal Switch Replacement - On Vehicle in Steering Column On Vehicle Service. Did you complete the repair? | -- | Go to Step 9 | --
9 |

1. Connect all connectors and components that were disconnected.
2. Verify that the flash to pass system operates properly.

Does the flash to pass system operate properly?

--

Go to Headlight System Check

Go to Step 1