Schematic Reference: Exterior Lights Schematics

Did you review the Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

Verify that the stop lamps are inoperative.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Apply pressure to the brake pedal, to activate the stoplamp switch.
2. Using a test lamp, check the stoplamp switch cavity 1 to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

1. Connect a fused jumper wire on the stoplamp switch connector between cavity 2 and cavity 1.
2. Using a test lamp, check the junction block 1, C6 cavity 8 to ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

Using a test lamp, check the junction block 1 C5 cavity 7 to ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 11

Repair the open in the GRN/WHT wire between the stoplamp switch cavity 1 and the junction block 1, C6 cavity 6. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 12

--

Using a test lamp, check the stoplamp switch cavity 2 to ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

Replace the stoplamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Is the replacement complete?

Go to Step 12

--

Repair the open in the RED/WHT wire between the stoplamp switch and the junction block 2, C3 cavity 7. Refer to Wiring Repairs in Wiring Systems.

Is the replacement complete?

Go to Step 12

--

Repair the open in the GRN/WHT wire between the junction block 1, C5 cavity 7 and SP450. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 12

--

Replace the junction block 1.

Is the replacement complete?

Go to Step 12

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3