B2470

Diagnostic Trouble Code Chart:

Wiring Schematic:

CIRCUIT DESCRIPTION
The body control module (PZM) commands the Daytime Running Lamps (DRL) ON or OFF through a discrete output to the DRL relay. The DRL is only active under the following conditions:
^ The ignition is in the RUN or START position.
^ The twilight sentinel is not active.
^ The headlamps (low and high beam) and front foglamps are OFF.
^ The transmission is not in PARK.

When the relay is energized, the relay places the high beams in a series circuit, providing lower illumination for the DRL.

A short to ground is tested under the following conditions:
^ Ignition 1 is ON.
^ The DRL is inactive.
^ The instrument cluster verifies that the vehicle has DRL.

A short to battery will be tested under the following conditions:
^ Ignition 1 is OFF or both ignition 1 DRLs are active.
^ The instrument cluster verifies that the vehicle has DRL.

CONDITIONS FOR SETTING THE DTC
The commanded state of the DRL does not match the feedback.

ACTION TAKEN WHEN THE DTC SETS
The PZM continues to command the state requested until the state is achieved or changes.

CONDITIONS FOR CLEARING THE DTC
The commanded state matches the feedback state for 2 consecutive monitoring cycles.