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Home >> Chevrolet >> 2021 >> Blazer L >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T50 (M3D), 9T60 (M3T) Or 9T65 (M3V) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826 >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Remove the component: Transmission Control Lever Knob
  3. Disconnect the electrical connector: S3 Transmission Shift Lever
  4. Test for less than 10 ohms between the test points: Low Reference circuit terminal 2 (harness side) & Ground
    • If 10 ohms or greater 
    1. Disconnect the appropriate ground connection:
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 2 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  5. Ignition - On / Vehicle - In Service Mode
  6. Verify the scan tool parameter: Driver Shift Control Mode Switch @ K9 Body Control Module = Inactive

    or Off

    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X2 @ K9 Body Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 11 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
    • Go to next step: If the specified state 
  7. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 3 & Ground circuit terminal 2 @ Component harness
  8. Verify the scan tool parameter: Driver Shift Control Mode Switch = Error or Invalid
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X2 @ K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 3 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
    • Go to next step: If the specified state 
  9. Test or replace the component: S2A Transmission Manual Shift Switch - Up/Down
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