GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Sonoma Pickup - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Backup Lamp System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the ignition switch to the ON position.
  2. Automatic transmissions: Depress the brake pedal and move the shift lever to the REVERSE position.

    3. Manual transmissions: Depress the clutch pedal and place the shifter into the REVERSE position.

Both of the backup lamps illuminate.

2
    • Automatic transmissions: Depress the brake pedal and move the shift lever to the PARK position.
    • Manual transmissions: Depress the clutch pedal and place the shifter into the NEUTRAL position.

Both of the backup lamps turn OFF.

Backup Lamps Always On

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.