Circuit / System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the harness connector C3 at the I/P fuse block.
Connect a test lamp between the control circuit terminal 42 and ground.
Ignition ON, command the lock rear doors 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 control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- 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, replace the BCM.
Connect a test lamp between the control circuit terminal 8 and B+.
Command the driver door unlock 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 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 and open / high resistance. If the circuit tests normal, replace the BCM.
Connect a test lamp between the control circuit terminal 41 and B+.
Command the unlock rear doors 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 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 and open / high resistance. If the circuit tests normal, replace the BCM.
If all circuits tests normal, replace the I/P fuse block.