B2603

CIRCUIT DESCRIPTION
The Body Control Module (BCM) illuminates LF turn signal lamp during Daytime Running Lamps operation in the day mode. The BCM applies steady power to the LF turn signal lamp which illuminates the LF turn lamp in a non flashing mode.

CONDITIONS FOR RUNNING THE DTC
The BCM must be commanding the LF turn signal lamp on.

CONDITIONS FOR SETTING THE DTC
^ The BCM detects a short to battery in the LF turn signal lamp circuit or the LF turn signal switch signal circuit.
^ The condition above must be present for more than 20 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 LF turn signal lamp control circuit.
^ A history DTC B2603 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ The BCM receives the Clear Code command from the scan tool.

DIAGNOSTIC AIDS
^ If the DTC B2603 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to battery in the LF turn signal lamp control circuit or the LF turn signal switch signal circuit.
- The BCM is intermittently shorted to battery.

TEST DESCRIPTION

Steps 1-7:

The number(s) below refer to the step number(s) on the diagnostic table.
3. Tests for voltage at the turn signal lamp.
4. Verifies that the BCM is providing battery positive voltage to the turn signal lamps.
5. Tests if ground is constantly being applied to the turn signal lamps battery positive voltage feed.