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Circuit/System Testing

WARNING: This page is about a different car, the 2021 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the connector at the S3 Transmission Shift Lever.
  2. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 4, and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the connector at the K38 Chassis Control Module.
    2. Test for infinite resistance between the 5 V reference circuit, K38 Chassis Control Module terminal 1, and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    4. Test for infinite resistance between the 5 V reference circuit, terminal 1, and all other pins of the K38 Chassis Control Module connector.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K38 Chassis Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the connector at the K38 Chassis Control Module.
    2. Ignition ON, engine OFF.
    3. Test for less than 1 V between 5 V reference circuit terminal 1 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    4. Ignition OFF.
    5. Test for infinite resistance between the 5 V reference circuit, terminal 1, and all other pins of the K38 Chassis Control Module connector.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K38 Chassis Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  3. Test for 4.875 - 5.125 V between the 5 V reference circuit terminal 4, and the low reference circuit terminal 2.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the connector at the K38 Chassis Control Module.
    2. Ignition ON, engine OFF.
    3. Test for less than 1 V between the low reference circuit terminal 5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    4. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    5. Test for infinite resistance between the low reference circuit, terminal 5, and all other pins of the K38 Chassis Control Module connector.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K38 Chassis Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the connector at the K38 Chassis Control Module.
    2. Ignition ON, engine OFF.
    3. Test for less than 1 V between the low reference circuit terminal 5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    4. Test for infinite resistance between the low reference circuit, terminal 5, and all other pins of the K38 Chassis Control Module connector.
      • If less than infinite resistance, repair the shorted together condition in the affected circuits.
      • If infinite resistance, replace the K38 Chassis Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  4. Test or replace the S3 Transmission Shift Lever.
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