Circuit/System Verification

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.

NOTE:

The vehicle may not be equipped with all components as listed below. Use schematics to determine which ignition relay supplies the ignition feed for the appropriate devices. Use the connector end view to identify the ignition circuit terminal for each of those devices.

Ignition ON/Vehicle in Service Mode.
Verify that the appropriate devices controlled by the KR76A Retained Accessory Power Relay 1 and KR76B Retained Accessory Power Relay 2 turn ON and OFF when switching the ignition between ON/Vehicle in Service Mode and OFF/Vehicle OFF.
- If the devices do not turn ON and OFF
  Refer to Circuit/System Testing - Diagnostic A.
- If the devices turn ON and OFF
Verify that the appropriate devices controlled by the KR73 Ignition Main Relay turn ON and OFF when commanding the Run/Crank Relay On and Off with a scan tool.
- If the devices do not turn ON and OFF
  Refer to Circuit/System Testing - Diagnostic B.
- If the devices turn ON and OFF
Verify that the appropriate devices controlled by the KR75 Engine Controls Ignition Relay turn ON and OFF when switching the ignition between ON/Vehicle in Service Mode and OFF/Vehicle OFF.
- If the devices do not turn ON and OFF
  Refer to Circuit/System Testing - Diagnostic C.
- If the devices turn ON and OFF
Verify that the appropriate devices controlled by the KR104A Battery Saver Relay 1 turn ON and OFF after enabling battery saver mode (transport mode).
- If the devices do not turn ON and OFF
  Refer to Circuit/System Testing - Diagnostic D.
- If the devices turn ON and OFF
Verify that the appropriate devices controlled by the KR104B Battery Saver Relay 2 turn ON and OFF after enabling battery saver mode (transport mode).
- If the devices do not turn ON and OFF
  Refer to Circuit/System Testing - Diagnostic E.
- If the devices turn ON and OFF
All OK.