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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 185 (Body Control System) >> Circuit Tests >> Rear Interior Light & Back Door Courtesy Switch Circuit >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If not using the hand-held tester, start the inspection from step  2.
  1. Check the back door courtesy switch using the hand-held tester. Connect the hand-held tester to the DLC3. See Figure. Check the back door courtesy switch using DATA LIST. If the results are OK, perform the next test procedure of the problem symptom. See step  4 of the SYSTEM OPERATION CHECK under TROUBLE SHOOTING. If the results are not good, go to the next step.
  2. Check the back door courtesy switch. See ANTI-THEFT SYSTEM article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT. If the results are OK, go to the next step. If the results are not good, replace the back door courtesy switch.
  3. Check the wiring harness and connector between the back door courtesy switch and body ECU. If the results are OK, perform the next test procedure of the problem symptom. See step  4 of the SYSTEM OPERATION CHECK under TROUBLE SHOOTING. If the results are not good, repair or replace the wiring harness or connector.
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