B2470

CIRCUIT DESCRIPTION
The underhood fuse block provides ignition 1 voltage to the DRL relay coil. The Body Control Module (BCM) provides ground to the DRL relay in control circuit. The BCM monitors the voltage in the DRL relay control circuit every second.

CONDITIONS FOR RUNNING THE DTC
A short to ground is tested under the following conditions:
^ The ignition switch is in the ON position.
^ The DRL relay is de-energized.

A short to battery will be tested under either of the following conditions:
^ The ignition switch is in the OFF position.
^ The ignition switch is in the ON position, and the DRL relay is energized.

CONDITIONS FOR SETTING THE DTC
One of the following conditions will cause the DTC to set:
^ The DRL relay is de-energized, and the BCM detects that the voltage in the control circuit of the DRL relay is low for 2 seconds.
^ The DRL relay is energized, and the BCM detects that the control circuit of the DRL relay is high for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM turns OFF the DRL relay output, until the condition for setting the DTC is no longer present.

CONDITIONS FOR CLEARING THE DTC
The DTC will clear when the following conditions are met:
^ The BCM detects that the voltage in the control circuit of the DRL relay is no longer low for 2 seconds.
^ The BCM detects that the control circuit of the DRL relay is no longer high for 2 seconds.

TEST DESCRIPTION

Steps 1-13:

The number(s) below refer to the step number(s) on the diagnostic table.
2. Listen for an audible click when the DRL relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the DRL relay. The IGN 1 fuse supplies power to the coil side of the DRL relay.
4. Verifies that the Body Control Module (BCM) is providing ground to the DRL relay.
5. Tests if ground is constantly being applied to the DRL relay.