Did you perform the Twilight Sentinel System Check?

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Go to Step 2

Go to Twilight Sentinel System Check

1. Ensure park brake is released and park brake indicator is OFF.
2. Place headlamps in ON position.
3. Switch headlamp dimmer between HIGH and LOW beams.

Does the headlamp system function properly?

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Go to Step 3

Go to Step 11

1. Turn headlamps OFF.
2. Disconnect connector C1 at headlamp control module.
3. Turn ignition to ON.
4. Connect test lamp between connector C1 cavity A and ground

Does test lamp light?

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Go to Step 4

Go to Step 12

Connect a test lamp between connector C1 cavity E and ground.

Does test lamp light?

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Go to Step 5

Go to Step 13

Connect a test lamp between connector C1 cavity F and B+.

Does test lamp light?

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Go to Step 6

Go to Step 14

Connect a test lamp between connector  C1 cavity  C and B+.

Does test lamp light?

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Go to Step 15

Go to Step 7

1. Disconnect connector C2 at headlamp control module.
2. Connect a test lamp between connector C2 cavity C and ground.

Does test lamp light?

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Go to Step 8

Go to Step 16

1. Connect both connectors C1 and C2 at headlamp control module.
2. Turn ignition ON.
3. Cover ambient light sensor with a dark cloth or tape.
4. Backprobe with a DMM between connector C2 cavity E at headlamp control module and ground

Is there continuity?

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Go to Step 9

Go to Step 16

Replace headlamp control module. Refer to Headlamp Control Module Replacement .

Is the repair complete?

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Go to Twilight Sentinel System Check

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1. Refer to Low and High Beams Headlamps Inoperative .
2. Make necessary repairs.

Is the repair complete?

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Go to Twilight Sentinel System Check

Go to Step 3

Locate and repair open in CKT 39 (PNK) between headlamp control module and IP fuse block. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Twilight Sentinel System Check

Go to Step 4

Locate and repair open in CKT 240 (ORN) between headlamp control module and IP fuse block. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Twilight Sentinel System Check

Go to Step 5

Locate and repair open in CKT 150 (BLK) between headlamp control module and ground G202. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Twilight Sentinel System Check

Go to Step 6

1. Locate and repair short to ground in CKT 1134 (LT BLU) between headlamp control module and park brake warning switch. Refer to Wiring Repairs in Wiring Systems.
2. Repair faulty park brake warning indicator lamp. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Twilight Sentinel System Check

Go to Step 7

Locate and repair open in CKT 2040 (ORN) between headlamp control module and IP fuse block. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Twilight Sentinel System Check

Go to Step 8

1. Disconnect connector C2 at headlamp control module.
2. Disconnect connector C2 at automatic day-night mirror.
3. Connect a DMM between automatic day-night mirror connector C2 cavity 2 and headlamp control module connector C2 cavity E.

Is there continuity?

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Go to Step 17

Go to Step 18

Replace inside automatic day-night mirror. Refer to Inside Rearview Mirror Replacement .

Is the repair complete?

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Go to Twilight Sentinel System Check

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Locate and repair open in CKT 1784 (YEL/BLK) between automatic day-night mirror and headlamp control module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Twilight Sentinel System Check

Go to Step 8