For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics
1 | Did you review the Lighting System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Lighting Systems
2 | Verify that the headlamps are inoperative in high beams. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 |

1. Disconnect the DRL control module connector.
2. Press the dimmer switch forward to the High position and.
3. Test for open between cavity 3 of the DRL control module connector and ground.

Is an open condition present in the circuit?

Go to Step 9

Go to Step 4

4 |

1. Disconnect the turn signal/headlamp switch connector.
2. Press the dimmer switch forward to the High position.
3. Test for open between cavity 7 and cavity 16 of the turn signal/headlamp switch.

Is there an open in the turn signal/headlamp switch?

Go to Step 5

Go to Step 6

5 | Test for an open between cavity 3 of the DRL control module connector and cavity 7 of the turn signal/headlamp switch connector. Is an open condition present in the circuit? | Go to Step 8 | Go to Step 7
6 | Replace the turn signal/headlamp switch. Is the replacement complete? | Go to Step 16 | --
7 | Repair the open in the RED/YEL wire between cavity 3 of the DRL control module connector and cavity 7 of the turn signal/headlamp switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 16 | --
8 | Repair the open in the WHT/BLK wire between cavity 16 of the turn signal/headlamp switch and ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 16 | --
9 |

1. Move the dimmer switch forward to the high position.
2. Test for high resistance between cavity 2 of the DIMMER relay socket to chassis ground.

Is there high resistance in the WHT/RED wire to ground?

Go to Step 10

Go to Step 11

10 |

1. Remove the DIMMER relay from fuse and relay block 2 located in the LH front engine compartment, left of the battery.
2. Connect a fused jumper from cavity 4 to cavity 3 of the DIMMER relay socket.
3. Turn the light switch to the Head position.

Do the headlamps illuminate to the high setting?

Go to Step 14

Go to Step 15

11 |

1. Disconnect the DRL control module connector.
2. Test for high resistance between cavity 20 of the DRL control module connector and cavity 2 of the DIMMER relay.

Is there high resistance in the WHT/RED wire?

Go to Step 13

Go to Step 12

12 | Locate and repair the open in the WHT/RED wire between the IP lamp dimmer relay and the DRL control module. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 16 | --
13 | Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement . Is the replacement complete? | Go to Step 16 | --
14 | Replace the DIMMER relay in the fuse and relay block 2 located in the LH front engine compartment, left of the battery. Is the replacement complete? | Go to Step 16 | --
15 | Locate and repair the open in the BLK/RED wire between the IP lamp dimmer relay and the fuse and relay block 1. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 16 | --
16 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3