Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Left Cornering Lamp Control | 1 | 1 | 1 | -- |
Right Cornering Lamp Control | 1 | 1 | 1 | -- |
Left Cornering Lamp Relay Control | 1 | 1 | B2590 00 | -- |
Right Cornering Lamp Relay Control | 1 | 1 | B2595 00 | -- |
Left Cornering Lamp Ground | -- | 1 | -- | -- |
Right Cornering Lamp Ground | -- | 1 | -- | -- |
1. Cornering Lamps Malfunction | ||||
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
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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
- Ignition OFF, disconnect the X2 harness connector at the underhood fuse block.
- Connect a test lamp between B+ and the appropriate control circuit listed below.
- 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 circuit tests normal, replace the underhood fuse block.
| • | Left cornering lamp control terminal 3 |
| • | Right cornering lamp control terminal 2 |
| ⇒ | 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. |
Cornering Lamp Malfunction
- Ignition OFF, disconnect the harness connector at the inoperative fog/cornering lamp.
- Ignition OFF, test for less than 5 ohms between the ground circuit terminal A and ground.
- Connect a test lamp between the control circuit terminal B and ground.
- 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 all circuits test normal, test or replace the cornering lamp.
| ⇒ | If greater than the specified range, test the ground circuit for and open/high resistance. |
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
