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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 150 (Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Retained Accessory Power Malfunction >> 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.

Diagnostic A

  1. Ignition OFF and all vehicle systems OFF, disconnect the KR76 Retained Accessory Power Relay. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal R3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal R1 and ground.
    • If the test lamp does not illuminate and the circuit breaker is not open 
    1. Ignition OFF, remove the test lamp.
    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 circuit breaker.
    • If the test lamp does not illuminate and the circuit breaker is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the KR76 Retained Accessory Power Relay.
    • If the test lamp illuminates 
  5. Connect a test lamp between the control circuit terminal R5 and the ground circuit terminal R3.
  6. Verify the test lamp turns ON and OFF when switching the ignition between ON and OFF.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module.
    2. Test for infinite resistance between the control circuit 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 K84 Keyless Entry Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K84 Keyless Entry Control Module.
    • If the test lamp turns ON and OFF 
  7. Connect the KR76 Retained Accessory Power Relay.
  8. Disconnect the appropriate X80 Accessory Power Receptacle, or T22 Mobile Device Wireless Charger Module.
  9. Ignition OFF.
  10. Verify that a test lamp does not illuminate between each of the ignition circuits listed below and ground.
    • X80G Accessory Power Receptacle - Instrument Panel - Ignition circuit terminal 1
    • X80H Accessory Power Receptacle - Center Console - Ignition circuit terminal 1
    • T22 Mobile Device Wireless Charger Module - Ignition circuit terminal 1
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • If the test lamp does not illuminate 
  11. Ignition ON.
  12. Verify that a test lamp illuminates between each of the ignition circuits listed below and ground.
    • X80G Accessory Power Receptacle - Instrument Panel - Ignition circuit terminal 1
    • X80H Accessory Power Receptacle - Center Console - Ignition circuit terminal 1
    • T22 Mobile Device Wireless Charger Module - Ignition circuit terminal 1
    • If the test lamp does not illuminate and the circuit breaker or fuse is not open 
    1. Ignition OFF remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the KR76 Retained Accessory Power Relay.
    • If the test lamp does not illuminate and the circuit breaker or fuse is open 
    1. Ignition OFF remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If resistance, test or replace the appropriate X80 Accessory Power Receptacle, or T22 Mobile Device Wireless Charger Module.
    • If the test lamp illuminates 
  13. Test or replace the appropriate X80 Accessory Power Receptacle, or T22 Mobile Device Wireless Charger Module.

Diagnostic B

  1. Ignition OFF and all vehicle systems OFF, disconnect the P2 Transmission Shift Lever Position Indicator.
  2. Connect a test lamp between the ignition circuit terminal 1 and ground, Ignition ON.
  3. Verify the test lamp turns ON and OFF when commanding the Accessory/Retained Accessory Power Relay On and Off with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove test lamp, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the ignition circuit 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 K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  4. Test or replace the P2 Transmission Shift Lever Position Indicator.
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