Backup Lamps Malfunction

Backup Lamps Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The BCKUP fuse supplies voltage to either the park/neutral position (PNP) switch on automatic transaxle or the backup lamp switch on manual transaxle. When the gear selector is placed in reverse, voltage is supplied through the appropriate switch to the backup lamps. The left backup lamps receive ground at G401. The right backup lamps receive ground at G402.

Circuit/System Verification

1. Place the gear selector in PARK or neutral.
2. Ignition ON, observer the backup lamps. The backup lamps should not be illuminated.

^ If the backup lamps are illuminated, refer to Backup Lamps Always On

3. Refer to Backup Lamps Inoperative

Circuit/System Testing

Backup Lamps Always On
1. Ignition OFF, disconnect the PNP switch on automatic transaxle or the backup lamp switch on manual transaxle.
2. Ignition ON, verify that the backup lamps are not illuminated.

^ If the backup lamps are illuminated, test the backup lamp supply voltage circuit for a short to voltage.
^ If all circuits test normal, replace the PNP switch on automatic transaxle or the backup lamp switch on manual transaxle.

Backup Lamps Inoperative
1. Ignition OFF, disconnect the PNP switch on automatic transaxle or the backup lamp switch on manual transaxle.
2. Ignition ON, verify that a test lamp illuminates between the appropriate voltage supply circuit and ground.

* Automatic transaxle - terminal 5
* Manual transaxle - terminal A

^ If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance.

3. Test the backup lamp supply voltage circuit between the appropriate switch and the backup lamps for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Park/Neutral Position Switch Replacement
* Backup Lamp Switch Replacement