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Fig. 64: Identifying Main Body ECU Connector Terminals b. Using a service wire, connect DB-18 (HRLY) on the wire harness side and body ground. c. Check that the headlight low beam illuminates. OK: Headlight low beam illuminates. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT RELAY - MAIN OK: REPLACE MAIN BODY ECU DOOR COURTESY SWITCH CIRCUIT DESCRIPTION The main body ECU receives a door open/closed signal from each door courtesy light switch. WIRING DIAGRAM
2009 Toyota Tundra 2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra
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