B2583

DTC B2583 Left Front Turn Signal Monitor Circuit:

DTC B2583 Left Front Turn Signal Monitor Circuit (Part 1 Of 2):

DTC B2583 Left Front Turn Signal Monitor Circuit (Part 2 Of 2):

CIRCUIT DESCRIPTION
The BCM monitors the LF turn signal circuit in order to determine the status of the turn signal switch. If the BCM detects an oscillating voltage on CKT 14, the BCM interprets this as a LF turn signal ON request from the turn signal switch. The BCM will de-energize the LH DRL relay, which will disable the LF turn signal lamp (which is ON for the DRL), thus allowing the LF turn signal to flash. If the BCM does not detect an oscillating voltage on CKT 14, the BCM interprets this as the LF turn signal being OFF. The BCM will then energize the LH DRL relay and continue normal DRL operation. The BCM monitors the LF turn signal CKT 14 and determines how long voltage is applied. If the voltage is applied for longer than expected, a malfunction is present and a DTC will set.

CONDITIONS FOR SETTING THE DTC
^ The BCM detects continuous battery voltage on the LF turn signal monitor circuit (CKT 14).
^ The condition must be present for longer than 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a DTC B2583 in the BCM memory.
^ No driver warning message will be displayed for this DTC.

CONDITIONS FOR CLEARING THE DTC
^ This DTC requires an ignition cycle in order to change from current to history.
^ The BCM no longer detects continuous battery voltage on the LF turn signal monitor circuit (CKT 14) for longer than 5 seconds.
^ A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Use the IPC clearing DTCs feature.
^ Use a scan tool.

DIAGNOSTIC AIDS
^ The following conditions may cause an intermittent malfunction:
- There is an intermittent short to voltage in CKT 14, CKT 16, or CKT 1314.
- The turn signal switch or the hazard switch is shorted internally or is sticking.
^ The BCM needs to detect voltage oscillations on CKT 14 in order to de-energize the LF DRL relay. If the BCM detects continuous voltage on CKT 14, the BCM interprets this as a short to voltage. The BCM will continue with normal DRL operation, and the LF turn signal will remain inoperative.
^ If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Intermittents and Poor Connections Diagnosis. Testing and Inspection

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. This test will check if a DTC B2578 is stored in the BCM memory.
3. This test will determine if there is a short to voltage in CKT 14.
4. This test will determine if there is a short to voltage in CKT 1314.
5. This step tests for an internal short in the DRL relay.
6. This test determines if the short to voltage is located in the hazard warning switch.
7. This test determines if the short to voltage is located in the turn signal switch.
8. This test determines if the short to voltage is located in the I/P.