B2613

DTC B2613






Circuit Description

The body control module (BCM) monitors the instrument panel (I/P) lamps dimming control circuit to determine the lighting intensity of the I/P lamps. When the BCM receives a varied voltage signal on the I/P lamps dimming control circuit, it applies a corresponding pulse width modulated (PWM) voltage signal through the I/P lamps supply voltage circuit to all the I/P lamps.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2613 Passenger Compartment Dimming Circuit High

Conditions for Running the DTC

* The battery voltage must be between 9-16 volts.
* The ignition switch is in the RUN position.
* The headlamp switch, must be in the OFF or AUTO position and the ambient light sensor must be in the low light state.
* The park brake is released.

Conditions for Setting the DTC

To set B2613, the following conditions must be present:

* The I/P lamps dimming control circuit is shorted to battery voltage.
* The above conditions must be met for 1 second.

Action Taken When the DTC Sets

The I/P lights remain full bright at all times.

Conditions for Clearing the MIL/DTC

* A current DTC will clear at the next fault-free ignition cycle.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.
* Use a scan tool in order to clear history and current DTCs.

Diagnostic Aids

* If the DTC is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
* The following conditions may cause an intermittent malfunction to occur:

- An intermittent short to battery positive voltage in the I/P lamps dimming control circuit
- A poor connection or an intermittent open in the low reference circuit
- The I/P dimmer switch is intermittently shorted to battery positive voltage.
- The BCM is intermittently shorted to battery positive voltage.

Test

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