B2603
DTC B2603
CIRCUIT DESCRIPTION
The body control module (BCM) controls the daytime running lights (DRL) relay. The BCM grounds the DRL relay coil control circuit, which energizes the DRL relay.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2603 DRL Control Circuit High
CONDITIONS FOR RUNNING THE DTC
The BCM must be commanding the DRL relay to energize.
CONDITIONS FOR SETTING THE DTC
- The BCM detects a short to battery in the DRL relay coil control circuit.
- The condition above must be present for more than 0.3 seconds.
ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2603 in memory.
CONDITIONS FOR CLEARING THE DTC
- A current DTC B2603 will clear if the BCM no longer detects a short to battery in the DRL relay coil control circuit.
- A history DTC B2603 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
DIAGNOSTIC AIDS
- If the DTC B2603 is a history DTC, the fault may be intermittent.
- The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to battery in the DRL relay coil control circuit
- The DRL relay coil is intermittently shorted to battery positive voltage internally.
- The BCM is intermittently shorted to battery positive voltage
TEST
