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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1040 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0615 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, test for less than 5 ohms between the relay ground circuit terminal 85 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  2. Ignition OFF. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85. Turn the ignition to the start position. The test lamp should turn ON when the ignition is in the START position, and OFF in all other positions.
    • If the test lamp is always on, test the control circuit for short to voltage. If the circuit tests normal, replace the ECM.
    • If the test lamp is always off, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, test or replace the STRTR relay.
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