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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> Starter Solenoid Does Not Click (KL9) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool ECM Ignition 1 Signal parameter is greater than 10 V.
    • If 10 V or less 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the ignition voltage circuits and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 10 V 
  3. Ignition OFF, disconnect the KR27 Starter Relay, ignition ON.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance,
    3. Disconnect X1 harness connector at the M64 Starter Motor.
    4. Test for infinite resistance between the control circuit terminal 30 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M64 Starter Motor.
    • If the test lamp illuminates 
  5. Ensure the parking brake is applied and the automatic transmission is in PARK or the manual transmission is in neutral. Momentarily install a 30 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30.
  6. Verify the M64 Starter Motor is activated.
    • If the M64 Starter Motor does not activate 
    1. Disconnect the X1 harness connector at the M64 Starter Motor.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If greater the 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M64 Starter Motor.
    • If the M64 Starter Motor activates 
  7. Ignition OFF, disconnect the KR27C Starter Pinion Solenoid Actuator Relay, ignition ON.
  8. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance,
    3. Disconnect X1 harness connector at the M64 Starter Motor.
    4. Test for infinite resistance between the control circuit terminal 30 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M64 Starter Motor.
    • If the test lamp illuminates 
  9. Ensure the parking brake is applied and the automatic transmission is in PARK or the manual transmission is in neutral. Momentarily install a 30 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30.
  10. Verify the M64 Starter Motor pinion engages.
    • If the M64 starter motor pinion does not engage 
    1. Disconnect the X1 harness connector at the M64 Starter Motor.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If greater the 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M64 Starter Motor.
    • If the M64 starter motor pinion engages 
  11. Ignition OFF, reconnect the KR27 Starter Relay and KR27C Starter Pinion Solenoid Actuator Relay, ignition CRANK.
  12. Verify the M64 Starter Motor is activated.
    • If the M64 starter motor does not activate 

      Test or replace the KR27 Starter Relay.

    • If the M64 starter motor activates 
  13. Test or replace the KR27C Starter Pinion Solenoid Actuator Relay.
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