Schematic Reference: Exterior Lights Schematics

Was the Lighting Systems Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With the scan tool, command the park lamp relay ON and OFF.

Does the park lamp relay turn ON and OFF with each command?

Go to Step 4

Go to Step 3

1. Remove the park lamp relay.
2. Install a fused jumper across the switched side of the park lamp relay.

Do the park lamps illuminate?

Go to Step 5

Go to Step 9

Test for a open or high resistance in the ground circuit of the headlamp switch. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

Test for a high resistance or an open in the park lamp relay control circuit of the park lamp relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 7

Test for a high resistance or an open in the park lamp switch signal circuit of the headlamp switch. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

Replace the park lamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 10

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 10

--

Replace the RH I/P fuse block. Refer to Instrument Panel Electrical Center or Junction Block Replacement - Right Side in Wiring Systems.

Did you complete the replacement?

Go to Step 10

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2