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.
- 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

Steps 1-10:

Steps 11-14: