Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the appropriate turn signal lamp.
- Test for less than 30 Ω between the ground circuit terminal listed below and ground.
- E4Y turn signal repeater lamp-left terminal 2
- E4Z turn signal repeater lamp-right terminal 2
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Disconnect the inline harness connector at the appropriate E4LF turn signal lamp-front listed below:
- E4LF turn signal lamp-left front X115 (Without TT6/TT7/TT8)
- E4LF turn signal lamp-left front X111 (With TT6/TT7/TT8)
- E4RF turn signal lamp-right front X116 (Without TT6/TT7/TT8)
- E4RF turn signal lamp-right front X112 (With TT6/TT7/TT8)
- Connect a test lamp between the control circuit terminal listed below and ground.
- E4LF turn signal lamp-left front terminal J
- E4RF turn signal lamp-right front terminal J
- E4Y turn signal repeater lamp-left terminal 1
- E4Z turn signal repeater lamp-right terminal 1
- Command the appropriate Turn Signal 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 control circuit for a short to voltage. If the circuit tests normal, replace the K9 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 K9 BCM.
- If all circuits test normal, replace the turn signal lamp.