SYMBOLDESCRIPTION1Harness Connector2Vehicle Speed Sensor3Crossmember4Heated Oxygen Sensor Bank 1 Sensor 2 Connector5Backup Lamp Switch Connector ( Part of the Park / Neutral Position Switch )6Park / Neutral Position Switch Connector7Park / Neutral Position Switch8Heated Oxygen Sensor Bank 1 Sensor 1 Connector GMC Acadia 2007 Main Engine Electrical Circuit Symbol Map