Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics and Interior Lights Schematics | |||
1 | Did you review Blackout (B/O) Lighting Description and Operation? | Go to Step 2 | |
2 | Observe the stoplamps while pressing the brake pedal. Does the system operate normally? | Go to Testing for Electrical Intermittents in Wiring Systems in 2005 C/K Truck Service Manual | Go to Step 3 |
3 | Inspect the fuse(s), check for damaged or corroded inline connectors, check for broken or partially broken wires inside insulation, and properly installed aftermarket equipment. Did you find the condition? | Go to Step 4 | Go to Step 5 |
4 | Make necessary repairs. Did you complete the repairs? | Go to Step 15 | -- |
5 | Are all the stoplamps inoperative? | Go to Step 6 | Go to Step 8 |
6 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 7 |
7 | Locate and repair the open or high resistance in circuit 913. Did you correct the condition? | Go to Step 15 | -- |
8 | Test the supply voltage circuit of the inoperative lamp for high resistance, an open, or a short to ground. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems in 2005 C/K Truck Service Manual. Did you find and correct the condition? | Go to Step 15 | Go to Step 9 |
9 | Test the ground circuit of the inoperative lamp for high resistance, or an open. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems in 2005 C/K Truck Service Manual. Did you find and correct the condition? | Go to Step 15 | Go to Step 14 |
10 | Using a fused jumper, connect cavity D to cavity F of the blackout (B/O) service lamp switch connector. Do the brake lamps illuminate? | Go to Step 11 | Go to Step 12 |
11 | Replace blackout (B/O) service lamp switch. Refer to Blackout Lamp Switch Replacement . Did you complete the replacement? | Go to Step 15 | ___ |
12 | Connect a test lamp between terminal A of the rear blackout (B/O) stoplamps and ground. Did the test lamp illuminate? | Go to Step 14 | Go to Step 13 |
13 | Locate and repair the open or high resistance in circuit 902. Did you correct the condition? | Go to Step 15 | ___ |
14 | Replace the blackout (B/O) stoplamp(s). Refer to Taillamp/Blackout (B/O) Lamp Replacement . Did you complete the replacement? | Go to Step 15 | ___ |
15 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
