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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.
  1. Ignition OFF, disconnect the harness connector at the K77 remote control door lock receiver.
  2. Ignition OFF, test for less than 20 Ω between the low reference circuit terminal 1 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 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, replace the K9 BCM.
  4. Test for 3-6 V between the serial data circuit terminal 3 and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    • If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. Ignition OFF, disconnect the X1 and X2 harness connectors at the K9 BCM.
  6. Ignition ON, test for less than 1 V between the serial data circuit terminal 27 and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage.
  7. Ignition OFF, test for infinite resistance between the serial data circuit terminal 27 and ground.
    • If not the specified value, test the serial data circuit for a short to ground.
  8. Test for less than 2 Ω between the K9 BCM serial data circuit terminal 27 X2 and the K77 remote control door lock receiver serial data circuit terminal 2.
    • If greater than the specified range, test the serial data circuit for an open/high resistance.
  9. If all circuits test normal, replace the K77 remote control door lock receiver. Verify DTC B3101 is not set.
    • If the DTC is set, replace the K9 BCM.
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