• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Park Lamp Switch ON Signal | 1 | 1 | 1 | -- |
License Lamp Control | 1 | 1 | 1 | -- |
Park Lamp Relay Control | 1 | 1 | B2585 00, 1 | -- |
Park Lamp Control | 1 | 1 | 1 | -- |
License Lamp Ground | -- | 1 | 1 | -- |
Park Lamps - LF Ground | -- | 1 | 1 | -- |
Park Lamps - RF Ground | -- | 1 | 1 | -- |
Tail/Stop and Turn Signal Lamps - LR Ground | -- | 1 | 1 | -- |
Tail/Stop and Turn Signal Lamps - RR Ground | -- | 1 | 1 | -- |
Turn Signal/Multifunction Switch Ground | -- | 1 | 1 | -- |
1. Park, License, and/or Tail Lamps Malfunction |
Battery positive voltage is applied at all times to both the coil and switched sides of the PARK LAMP relay. Ground is applied from G200 to the multifunction switch at all times. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp relay control circuit. This energizes the PARK LAMP relay and applies battery positive voltage to all of the park, tail, license, and marker lamps.
Battery voltage must be between 9-16 volts.
DTC B2585 00 will set when the BCM detects a short to voltage in the park lamp relay control circuit.
When DTC B2585 00 is present, the park lamps will not operate.
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the park lamp relay. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |