B2628
DTC B2628
CIRCUIT DESCRIPTION
The body control module (BCM) receives a variable voltage from the instrument panel (I/P) lamp dimmer switch. The BCM uses this signal in order to vary the illumination level of the I/P lamps. The I/P dimming lamps output from the BCM is a pulse width modulated voltage supply used to light the I/P lamps.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2628 Display Dimming Pulse Width Modulation (PWM) Output Circuit High
CONDITIONS FOR RUNNING THE DTC
The park lamp input is inactive, park and headlamps OFF.
CONDITIONS FOR SETTING THE DTC
The following condition will set this DTC:
The I/P dimming lamps output is shorted to voltage.
ACTION TAKEN WHEN THE DTC SETS
If the I/P dimming lamps output is shorted to voltage, the I/P lamps will illuminate at full intensity.
CONDITIONS FOR CLEARING THE DTC
- The BCM receives the clear code command from the scan tool.
- A current DTC will clear when the conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.
DIAGNOSTIC AIDS
If the DTC is a history DTC, the malfunction may be intermittent.
TEST
