B2625

CIRCUIT DESCRIPTION
The body control module (BCM) receives a variable voltage from the instrument panel lamp dimmer switch. The BCM uses this signal in order to vary the illumination level of the instrument panel lamps. The instrument panel dimming lamps output from the BCM is a pulse width modulated voltage supply used to light the instrument panel lamps. If a malfunction occurs in the instrument panel dimming lamps output circuit, this DTC is set.

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 instrument panel dimming lamps output is open for 125 milliseconds.
^ The instrument panel dimming lamps output is shorted to ground for 125 milliseconds.
^ The instrument panel dimming lamps output is shorted to battery positive voltage for 125 milliseconds.

ACTION TAKEN WHEN THE DTC SETS
^ If the instrument panel dimming lamps output is open, the instrument panel lamps will not illuminate.
^ If the instrument panel dimming lamps output is shorted to ground, the instrument panel lamps will not illuminate.
^ If the instrument panel dimming lamps output is shorted to battery positive voltage, the instrument panel 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. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

TEST

Steps 1-12: