B2602

DTC B2602

CIRCUIT DESCRIPTION
The daytime running lights (DRL) relay is controlled by the body control module (BCM). Battery positive voltage is applied to the relay coil at all times. The BCM grounds the DRL relay control circuit in order to turn ON the DRL relay.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2602 Daytime Running Lamp Circuit Low

CONDITIONS FOR RUNNING THE DTC
- The ignition switch is in the RUN position.
- The headlamp switch is in the AUTO position.
- The park brake is not applied.
- The gear selector is not in the PARK position.

CONDITIONS FOR SETTING THE DTC
All of the following conditions must be met:
- The BCM is not commanding the DRL relay ON.
- The DRL relay control circuit is open or shorted to ground, or the DRL relay coil is open, or battery positive voltage to the DRL relay is open.

ACTION TAKEN WHEN THE DTC SETS
The BCM disables the DRL relay control as long as the malfunction is present.

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
- The park brake must not be set and the transaxle must be in gear for the DRL to operate properly.
- If the DTC is a history DTC, the problem may be intermittent.

TEST DESCRIPTION

Step 1 - Step 13:

The numbers below refer to the step numbers 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.
4. Verifies that the body control module is providing ground to the DRL relay.
5. Tests if ground is constantly being applied to the DRL relay.