Service manual

8-98 Lighting Systems Body and Accessories
2006 LSSV Service Manual Supplement
Blackout (B/O) Stoplamps Inoperative
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
Go to Blackout
(B/O) Lighting
Circuit Operation
2
Observe the stoplamps while pressing the brake pedal.
Does the system operate normally?
Go to Testing for
Electrical
Intermittents in
Wiring Systems in
2006 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
1. Disconnect blackout (B/O) service lamp switch.
2. Connect test lamp between circuit 913 (WH) cavity D
wire and ground.
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 2006 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 2006 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
(B/O) 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
___