Cornering Lamps Malfunction
Cornering Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Battery voltage is applied at all times to both front cornering lamp PCB relays which are an internal part of the underhood fuse block. When the turn signal switch is activated, ground is applied through the turn signal switch signal circuit to the body control module (BCM) The BCM then applies a ground to the appropriate cornering lamp relay control circuit energizing the relay. With the relay energized, battery voltage is applied through the switch side of the relay, the LT or RT CRN LAMP Fuse, and the cornering lamp supply voltage circuit to the cornering lamp.
Reference Information
Schematic Reference
Exterior Lights Schematics (Exterior Lights Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Exterior Lighting Systems Description and Operation (Exterior Lighting Systems)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, park lamps ON, place the turn signal switch in the direction of the inoperative cornering lamp. Verify that a test lamp connected to ground illuminates at each of the test points on the appropriate CRN LAMP Fuse.
If the test lamp does not illuminate at either test point or remains illuminated at all times with turn signal switch OFF, refer to the Cornering Lamp PCB Relay Malfunction.
If the test lamp illuminates, refer to the Cornering Lamp Malfunction.
Circuit/System Testing
Cornering Lamp PCB Relay Malfunction
1. Ignition OFF, disconnect the X2 harness connector at the underhood fuse block.
2. Connect a test lamp between B+ and the appropriate control circuit listed below.
* Left cornering lamp control terminal 3
* Right cornering lamp control terminal 2
3. Ignition ON, park lamps ON, operate the turn signal switch ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
4. If the circuit tests normal, replace the underhood fuse block.
Cornering Lamp Malfunction
1. Ignition OFF, disconnect the harness connector at the inoperative fog/cornering lamp.
2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for and open/high resistance.
3. Connect a test lamp between the control circuit terminal B and ground.
4. Ignition ON, park lamps ON, operate the turn signal switch ON and OFF, The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the underhood fuse block.
5. If all circuits test normal, test or replace the cornering lamp.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Cornering Lamp Replacement (Service and Repair)
* Cornering Lamp Bulb Replacement (Service and Repair)
* Underhood Electrical Center or Junction Block Replacement (Removal and Replacement)
* Control Module References (Programming and Relearning)for BCM replacement, setup, and programming