PRE-RELEASE
DTC B2570
| DTC B2570 |
| 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
has overviews of all diagnostic categories.
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| DTC Descriptor |
DTC B2570 02
Trunk Lamp Control Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Trunk Lamp Control
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B2570 02
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1
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2
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-
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Ground
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-
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1
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1
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-
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1. Rear Compartment Lamps Inoperative
2. Rear Compartment Lamps Always ON |
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| Circuit/System Description |
When the body control module (BCM) receives a trunk open signal, the BCM supplies B+ to the trunk lamp control circuit. This will illuminate the rear compartment lamps.
| Conditions for Running the DTC |
The trunk is in open position.
| Conditions for Setting the DTC |
The BCM detects a short to ground on the trunk lamp control circuits.
| Action Taken When the DTC Sets |
The rear compartment lamp is OFF.
| Conditions for Clearing the DTC |
The condition responsible for setting the DTC no longer exists.
| Reference Information |
Schematic Reference
Interior Lights Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Interior 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 information on diagnostic tools
| Circuit/System Verification |
Command the Trunk Lamp Duty Cycle test ON and OFF with a scan tool. The rear compartment lamps should be ON and OFF.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the E8E Rear Compartment Courtesy Lamp - Left or E8F Rear Compartment Courtesy Lamp - Right.
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| 2. |
Test for less than 5 Ω between the ground circuit terminal 2 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Connect a test lamp between the E8E Rear Compartment Courtesy Lamp - Left or E8F Rear Compartment Courtesy Lamp - Right and ground.
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| 5. |
Command the Trunk Lamp Duty Cycle test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
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| 6. |
If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
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| 7. |
If the test lamp is always OFF, test the control circuit for a short to round or open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
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| 8. |
If the all circuits test normal, replace the E8E Rear Compartment Courtesy Lamp - Left or E8F Rear Compartment Courtesy Lamp - Right.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Rear Compartment Courtesy Lamp Replacement
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Control Module References
for BCM control module replacement setup and programming
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