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Circuit/System Testing

WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON and transmission in Park, with a scan tool verify the ECM Park/Neutral Position Switch parameter displays Active.
    • If the parameter does not display Active, test the ECM Park/Neutral signal circuit terminal listed below for a short to ground or an open/high resistance:
    • Terminal 17 X2 (LAU engine)
    • Terminal 58 X2 (LF1 engine)
  2. Ignition ON, with a scan tool verify the ECM Ignition 1 Signal parameter is greater than 10 V.
    • If less than the specified range, test the ECM ignition circuit terminal listed below for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • 51 X1 LF1
    • 54 X2 LAU
  3. Ignition OFF, disconnect the KR27 starter relay.
  4. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5.0 Ω between the relay ground circuit terminal 85 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • 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 control circuit terminal 87 for a short to ground.
  6. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  7. Parking brake applied and transmission in PARK, momentarily install a 30 A fused jumper wire between the B+ circuit terminal 30 and the control output circuit terminal 87. Verify the starter is activated.
    • If the starter does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the M64 starter motor.
  8. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  9. Transmission in park/neutral, command the starter relay 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 K20 ECM.
    • 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 K20 ECM.
  10. If all circuits test normal, test or replace the KR27 starter relay.
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