Courtesy Lamp Circuit Test
WARNING: This page is about a different car, the 2008 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X3, X4 harness connectors at the BCM.
- Verify that a test lamp illuminates between B+ circuits listed below and ground.
- Terminal 2 X3
- Terminal 2 X4
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the related courtesy lamp supply voltage circuits for a short to ground.
- Ignition OFF, connect the BCM harness connectors.
- Disconnect the harness connector at the inoperative courtesy lamp lamp.
- Test for less than 5.0 ohms of resistance between the appropriate ground circuit terminal listed below and ground.
- Dome lamp - terminal B
- Courtesy/map lamp - terminal D
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Connect a test lamp between the appropriate supply voltage circuit terminal listed below and ground.
- Dome lamp - terminal A
- Courtesy/map lamp - terminal C
- Command the Courtesy Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the courtesy lamp bulb.