PRE-RELEASE
DTC B2652
| DTC B2652 |
| 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 B2652 02
Passenger Compartment Dimming 3 Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Interior Accent Light Control | B2652 02 | 2 | 1 | - |
| 1. Interior Accent Light at Full Intensity and Does Not Dim 2. Interior Accent Light do Not Illuminate | ||||
| Circuit/System Description |
The body control module (BCM) uses the ambient light sensor to determine which brightness of the accent lighting is needed. The BCM applies a pulse width modulated (PWM) voltage through the accent light LED control circuit. Depending on the specified lighting requirements, the BCM has three different accent lighting settings:
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Daylight conditions (70%)
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Night conditions (40%)
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Welcome light (100%)
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| Conditions for Running the DTC |
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The ignition is ON.
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The headlamps or park lamps ON.
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| Conditions for Setting the DTC |
The BCM detects a short to ground on the accent lighting control circuit.
| Action Taken When the DTC Sets |
The BCM does not attempt to illuminate the accent lighting.
| Conditions for Clearing the DTC |
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The condition responsible for setting the DTC no longer exists.
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A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.
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| Reference Information |
Schematic Reference
Interior Lights Dimming 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 scan tool information
| Circuit/System Verification |
Ignition ON, command the Accent Lighting ON and OFF with a scan tool. The accent lighting should turn ON and OFF when changing between the commanded states.
| Circuit/System Testing |
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Ignition OFF, disconnect the harness connectors at the appropriate E1 accent light.
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| 2. |
Test for less than 5 Ω between the ground circuit terminal and ground.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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Ignition OFF, doors closed, wait 20 seconds before testing for less than 0.3 V between the control circuit terminal and ground.
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If greater than the specified value, test the circuit for a short to voltage. If the circuits test normal, replace the K9 BCM.
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Ignition ON, doors open, test for greater than 11 V between the control circuit terminal and ground.
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If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.
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If all circuits test normal, test or replace the E1 accent light.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Refer to the appropriate replacement procedure for the lighting component that requires replacement.
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Control Module References
for BCM replacement, programming and setup
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