Diagnostic Routine N

Diagnostic Routine N

Diagnostic Overview

One Or More Stoplamps Are Inoperative

Refer to Wiring Diagram Set 90 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to Stoplamps .

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Inspect the high mounted stoplamp for damage.

- Inspect the rear lamp assembly for damage.

Pinpoint Test

1. DETERMINE THE INOPERATIVE STOPLAMP

1. Ignition OFF.

2. Apply the brake pedal and observe the stoplamps.

Are all the stoplamps inoperative?








2. CHECK THE HIGH MOUNTED STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

1. Disconnect: High Mounted Stoplamp.

2. While applying the brake pedal, measure:





Is the voltage greater than 11 volts?








3. CHECK THE HIGH MOUNTED STOPLAMP GROUND CIRCUIT FOR AN OPEN

1. While applying the brake pedal, measure:





Is the voltage greater than 11 volts?








4. CHECK THE REAR LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

1. Disconnect: Inoperative Rear Lamp.

2. While applying the brake pedal, measure:





Is the voltage greater than 11 volts?








5. CHECK THE REAR LAMP ASSEMBLY GROUND CIRCUIT FOR AN OPEN

1. While applying the brake pedal, measure:





Is the voltage greater than 11 volts?








6. CHECK THE REAR LAMP ASSEMBLY JUMPER HARNESS

1. Inspect the rear lamp jumper harness for an open.

Is the rear lamp jumper harness OK?