B2625
DTC B2625
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. If a malfunction occurs in the I/P dimming lamps output circuit, this DTC is set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit Range/Performance
CONDITIONS FOR RUNNING THE DTC
The park lamp input is active (park or headlamps ON).
CONDITIONS FOR SETTING THE DTC
Any of the following conditions will set this DTC:
- The I/P dimming lamps output is open for 125 milliseconds.
- The I/P dimming lamps output is shorted to ground for 125 milliseconds.
- The I/P dimming lamps output is shorted to battery positive voltage for 125 milliseconds.
ACTION TAKEN WHEN THE DTC SETS
- If the I/P dimming lamps output is open, the I/P lamps will not illuminate.
- If the I/P dimming lamps output is shorted to ground, the I/P lamps will not illuminate.
- If the I/P dimming lamps output is shorted to battery positive voltage, the I/P lamps will illuminate at full intensity.
CONDITIONS FOR CLEARING THE DTC
- The conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.
- The BCM receives the clear code command from the scan tool.
DIAGNOSTIC AIDS
If the DTC is a history DTC, the malfunction may be intermittent.
TEST
