PRE-RELEASE
DTC B2580
| DTC B2580 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC B2580 02
High Beam Control Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Headlamp High Beam Relay Control | B2580 02 | 2 | 1 | - |
| 1. High Beam Lamps Always ON 2. High Beam Lamps Inoperative | ||||
| Circuit/System Description |
The headlamp high beam relay is supplied with battery voltage at all times. The turn signal/multifunction switch signal circuit is grounded by pressing the turn signal/multifunction switch. The body control module (BCM) energizes the headlamp high beam relay by applying ground to the headlamp high beam relay control circuit. When the headlamp high beam relay is energized, the relay switch contacts close and battery voltage is applied through the high beam lamp fuses to the high beam lamp supply voltage circuit which illuminates the high beam lamps.
| Conditions for Running the DTC |
High beam lamps ON.
| Conditions for Setting the DTC |
The BCM detects a short to ground in the headlamp high beam relay control circuit.
| Action Taken When the DTC Sets |
The high beam headlamps will always be illuminated.
| Conditions for Clearing the DTC |
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The DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| Reference Information |
Schematic Reference
Headlights/Daytime Running Lights (DRL) Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the X5 harness connector at the K9 BCM.
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| 2. |
Ignition ON, test for B+ between the control circuit terminal 18 and ground.
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If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underhood fuse block.
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| 4. |
If all circuits test normal, replace the K9 BCM.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Front Compartment Fuse Block Replacement
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Control Module References
for BCM replacement, programming and setup
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