B261A
DTC B261A
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 B261A 02
- Passenger Compartment Dimming 4 Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
The instrument panel (I/P) dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal that will increase as the brightness of the light are increased and decrease as the brightness of the lights are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the individual accent lamps via the accent lamps control circuit. The BCM also sends a serial data message to the driver and front passenger door control modules requesting the accent lamps on both doors be dimmed to the requested level. The driver and front passenger door modules respond by applying the appropriate voltage for the requested dim level to the accent lights.
Conditions for Running the DTC
* Battery voltage must be between 9-16 volts.
* Park lamps ON.
Conditions for Setting the DTC
DTC B261A 02 will set when the BCM detects a short to ground in the accent lamp control circuit.
Actions Taken When the DTC Sets
When DTC B261A 02 is present, the BCM will not illuminate the accent lamps supplied by the accent lamp control circuit.
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 the following components:
* Accent lamp - driver seat
* Accent lamp - lower left I/P
* Accent lamp - left I/P
* Accent lamp - left rear door
* Accent lamp - left rear door handle
* Accent lamp - overhead console
* Accent lamp - passenger seat
* Accent lamp - lower right I/P
* Accent lamp - right I/P
* Accent lamp - right rear door
* Accent lamp - right rear door handle
2. Ignition ON, with a scan tool clear the DTC and operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
• If DTC B261A 02 sets as current, test the accent lamp control circuit for a short to ground. If the circuit tests normal, replace the BCM.
3. Reconnect each accent lamp one at a time and verify that the DTC does not reset as current after each accent lamps is reconnected.
• If the DTC sets as current, test or replace the accent lamp responsible for setting the DTC.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Luminescent Lamp Replacement - Driver or Passenger Seat (Luminescent Lamp Replacement - Driver or Passenger Seat)
* Door Lamp Replacement (Door Lamp Replacement)
* Instrument Panel Flood Lamp Replacement - Left Side (Instrument Panel Flood Lamp Replacement - Left Side)
* Instrument Panel Flood Lamp Replacement - Right Side (Instrument Panel Flood Lamp Replacement - Right Side)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming