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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 309 (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 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostic A

  1. Ignition OFF/Vehicle OFF, connect a test lamp between the ignition circuits listed below and ground.
    • X51A Fuse Block - Instrument Panel - Fuse F20DA
    • X51A Fuse Block - Instrument Panel - Fuse F24DA
    • X51A Fuse Block - Instrument Panel - Circuit breaker F42DA
  2. Disconnect the harness connector at the K84 Keyless Entry Control Module.
  3. Momentarily Install a 3 A fused jumper wire between the control circuit terminal 7 X1 and B+.
  4. Verify the test lamp turns ON and OFF when connecting and disconnecting the jumper wire.
    • If the test lamp is always OFF 
    1. 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.
    2. 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 X51A Fuse Block - Instrument Panel.
    • If the test lamp is always ON 
    1. 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 the test lamp turns ON and OFF 
  5. Ignition OFF/Vehicle OFF, connect the harness connector at the K84 Keyless Entry Control Module.
    6. NOTE:

    The vehicle may not be equipped with all components as listed below.

  6. Disconnect the appropriate X92 USB Receptacle, or X80F Accessory Power Receptacle - Front.
  7. Ignition ON/Vehicle in Service Mode.
  8. Verify that a test lamp illuminates between each of the ignition circuits listed below and ground.
    • X92 USB Receptacle - Ignition circuit terminal 6
    • X92RA USB Receptacle - Rear Compartment - Ignition circuit terminal 6
    • X80F Accessory Power Receptacle - Front - Ignition circuit terminal A
    • If the test lamp does not illuminate and the circuit fuse good 
    1. Ignition OFF/Vehicle 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, Replace the K84 Keyless Entry Control Module.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF/Vehicle 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 X92 USB Receptacle, or X80F Accessory Power Receptacle - Front.
    • If the test lamp illuminates 
  9. Test or replace the appropriate X92 USB Receptacle, or X80F Accessory Power Receptacle - Front.

Diagnostic B

    NOTE:

    The vehicle may not be equipped with all components as listed below.

  1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the P2 Transmission Shift Lever Position Indicator, X81 Accessory Power Receptacle -110V AC, and X81B Accessory Power Receptacle - 220V AC.
  2. Connect a test lamp between each of the ignition circuits listed below and ground.
    • P2 Transmission Shift Lever Position Indicator - Ignition circuit terminal 1
    • X81 Accessory Power Receptacle - 110V AC - Ignition circuit terminal 1
    • X81B Accessory Power Receptacle - 220V AC - Ignition circuit terminal 1
  3. Ignition ON/Vehicle in Service Mode.
  4. 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/Vehicle 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/Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON/Vehicle in Service Mode.
    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 
  5. Test or replace the appropriate P2 Transmission Shift Lever Position Indicator, X81 Accessory Power Receptacle -110V AC, or X81B Accessory Power Receptacle - 220V AC.
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