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Home >> Chevrolet >> 2015 >> Captiva Sport LS >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1128: Lost Communication with Park Brake Control Module >> Circuit/System Testing
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Circuit/System Testing

NOTE:

Use the schematic to identify the following:

  • The K83 parking brake control module location on the high speed GMLAN serial data circuits
  • The K83 parking brake control modules B+, ignition, ground, serial data communication enable, and serial data circuit terminals
  1. Ignition OFF, disconnect the harness connector at the K83 parking brake control module.
  2. Ignition OFF and all vehicle systems OFF, key out of the ignition switch, all access doors closed. Test for less than 10 Ω between the ground circuit terminal H and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal A 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 fuse is open, test the control circuits of the K83 parking brake control module for a short to ground. If the circuits test normal, replace the K83 parking brake control module.
  4. Ignition ON, verify that a test lamp illuminates between the serial data communication enable circuit terminal P and ground.
    • If the test lamp does not illuminate, test the entire circuit, including the B+ circuit to the K9 body control module (BCM), for an open/high resistance or short to ground. If the circuits test normal, replace the K9 BCM.
  5. Ignition OFF, disconnect the harness connector at the K17 electronic brake control module.
  6. Ignition OFF and all vehicle systems OFF, key out of the ignition switch, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 2 Ω in each high speed GMLAN serial data circuit between the K83 parking brake control module and the K17 electronic brake control module:
    • K83 parking brake control module serial data circuit terminal F and K17 electronic brake control module serial data circuit terminal 11
    • K83 parking brake control module serial data circuit terminal L and K17 electronic brake control module serial data circuit terminal 14
    • If greater than the specified range, test the serial data circuit for an open/high resistance between the K83 parking brake control module and the K17 electronic brake control module.
  7. If all circuits test normal, replace the K83 parking brake control module.
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