B2625

DTC B2625

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC B2625 02
- Display Dimming Pulse Width Modulation (PWM) Output Circuit Short to Ground

Diagnostic Fault Information





Circuit/System Description

The body control module (BCM) receives an input from the instrument panel (I/P) dimmer switch. The BCM provides the I/P dimmer switch with voltage and a low reference. The I/P dimmer switch is a potentiometer that varies the input signal voltage to the BCM. This input determines the intensity level of the backlighting illumination. The driver may change intensity of the backlighting by positioning the I/P dimmer switch between the minimum and maximum settings. The BCM will default to full intensity if the input from the I/P dimmer switch is not within the specified values. The backlighting illumination intensity is controlled by the BCM by varying the pulse width modulation (PWM) voltage that feeds the dimming signal circuits of the individual lamps. All interior backlighting lamps are permanently grounded.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Condition for Setting the DTC

DTC B2625 02 will set when the BCM detects a short to ground in the instrument panel lamps supply voltage circuit.

Action Taken When the DTC Sets

When DTC B2625 02 is present, the interior backlighting will not operate.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information
Schematic Reference

Interior Lights Dimming Schematics (Interior Lights Dimming Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at all components fed by the I/P lamps control circuit.
2. Verify that DTC B2625 02 sets.

• If DTC B2625 02 sets, test the I/P lamps control circuit for a short to ground. If the circuit tests normal, replace the BCM.

3. Ignition OFF, connect each component fed by the I/P lamps control circuit one at a time and verify each time that the DTC does not set.

• If DTC B2625 02 sets as current, replace the component that caused the DTC to set.

4. If all circuits test normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Electronic Traction Control Switch Replacement (Service and Repair)
* Front Side Door Window Switch Replacement (Service and Repair)
* Radio Replacement (SKY) (Radio Replacement)Radio Replacement (Solstice) (Radio Replacement)
* Instrument Cluster Replacement (Solstice) (Service and Repair)Instrument Cluster Replacement (SKY) (Service and Repair)
* Fog Lamp Switch Replacement (Service and Repair)
* Hazard Warning Switch Replacement (Service and Repair)
* Heater and Air Conditioning Control Replacement (Service and Repair)
* Transmission Control Lever Knob Replacement (SKY) (Transmission Control Lever Knob Replacement)Transmission Control Lever Knob Replacement (Solstice) (Transmission Control Lever Knob Replacement)
* Power Mirror Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming