Schematic Reference: Exterior Lights Schematics

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle Controls System in 2005 C/K Truck Service Manual

1. Block the wheels and set the parking brake.
2. Turn ON the ignition, with the engine OFF.
3. Place the gear selector in and out of the reverse position.

Does the backup alarm operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems in 2005 C/K Truck Service Manual

Go to Step 3

Do the backup lamps operate properly?

Go to Step 4

Go to Backup Lamps Inoperative

Inspect for poor connections at the harness connector of the backup lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems in 2005 C/K Truck Service Manual.

Did you find and correct the condition?

Go to Step 8

Go to Step 5

Test the backup alarm supply voltage circuit for a 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 8

Go to Step 6

Test the backup alarm circuit for a 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 8

Go to Step 7

Replace the backup alarm. Refer to Backup Alarm Replacement .

Did you complete the replacement?

Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2