Diagnostic Instructions
| • | 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. |
DTC Descriptor
DTC B2590 00: Left Cornering Lamp CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Left Cornering Lamp Relay Control | 1 | 1 | B2590 00, 1 | -- |
Park Lamp Switch ON Signal | 1 | 1 | 1 | -- |
License Lamp Supply Voltage | 1 | 1 | 1 | -- |
Park Lamp Voltage Supply | 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 | ||||
Circuit/System Description
Battery positive voltage is applied at all times to both the coil and switched sides of the left and right PARK LAMP relays. 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 left and right park lamp relay control circuits. This energizes the left and right PARK LAMP relays and applies battery positive voltage to all of the park, tail, license, and marker lamps. For more detailed information concerning park lamp operation refer to Exterior Lighting Systems Description and Operation .
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
DTC B2590 00 will set when the BCM detects a short to voltage in the left cornering lamp relay control circuit.
Actions Taken When the DTC Sets
When DTC B2590 00 is present, the left cornering lamps will not operate.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
| • | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the left park lamp relay.
- Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal R21 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal R25 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal R22 and ground.
- Connect a test lamp between the B+ circuit terminal R25 and the control circuit terminal R21.
- Command the left cornering lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, test or replace the left park lamp relay.
| ⇒ | 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 R23 for a short to ground. If the circuit tests normal, test or replace the left 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
