Schematic Reference: Exterior Lights Schematics and Interior Lights Schematics

Did you review Blackout (B/O) Lighting Description and Operation?

Go to Step 2

Go to Blackout Lighting Circuit Operation

Inspect condition of fuses. If fuse is open, locate and repair source of overload and replace fuse.

Did you find and correct the condition?

Go to Step 20

Go to Step 3

1. Place blackout (B/O) service switch in blackout (B/O) mode.
2. Turn ON blackout (B/O) headlamp switch.
3. Connect a test lamp to circuit 901 (TN/WH) at connector C102M cavity A of the blackout (B/O) headlamp and ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

1. Disconnect the blackout (B/O) lamp.
2. Connect a self-powered test lamp at circuit 151 (BK) and ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 5

Locate and repair open circuit 151 (BK) between blackout (B/O) headlamp and G100M.

Did you complete the repair?

Go to Step 20

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Replace blackout (B/O) headlamp bulb.

Did you complete the replacement?

Go to Step 20

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1. Place blackout (B/O) switch to ON position.
2. Connect a test lamp at circuit 901 (TN/WH) wire between blackout (B/O) drive relay cavity 85 and ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

Locate and repair open in circuit 901 (TN/WH) wire between blackout (B/O) lamp cavity A and blackout (B/O) drive relay cavity 85.

Did you complete the repair?

Go to Step 20

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Connect a test lamp at circuit 911 (PK) wire between blackout (B/O) drive relay cavity 87 and ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 11

Connect test lamp at circuit 915 (WH) wire cavity 86 and cavity 87 of the blackout (B/O) drive relay.

Does the test lamp illuminate?

Go to Step 13

Go to Step 15

Connect a test lamp from blackout (B/O) service switch cavity A circuit 911 (PK) and ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 14

Locate and repair open in circuit 911 (PK) between blackout (B/O) service lamp switch and blackout (B/O) drive relay.

Did you complete the repair?

Go to Step 20

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Replace blackout (B/O) drive relay.

Did you complete the replacement?

Go to Step 20

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Connect a test lamp from the blackout (B/O) service switch at cavity B circuit 40 (OG) and ground.

Does the test lamp illuminate?

Go to Step 19

Go to Step 18

1. Disconnect blackout (B/O) headlamp switch.
2. Connect a self-powered test lamp between blackout (B/O) headlamp switch cavity E circuit 150 (BLK) and ground.

Does the test lamp illuminate?

Go to Step 16

Go to Step 17

Replace blackout (B/O) headlamp switch. Refer to Blackout Lamp Switch Replacement .

Did you complete the replacement?

Go to Step 20

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Locate and repair open in circuit 150 (BLK) wire between blackout (B/O) headlamp switch and ground.

Did you complete the repair?

Go to Step 20

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Locate and repair open in circuit 40 (ORN) wire between connector C241 and blackout (B/O) service lamp switch cavity B.

Did you complete the repair?

Go to Step 20

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Replace blackout (B/O) service switch. Refer to Blackout Lamp Switch Replacement .

Did you complete the replacement?

Go to Step 20

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2