Body Control ECU
Check body ECU operation. See BODY CONTROL SYSTEMS - RX300 article. Replace body ECU as necessary. If body control ECU is operating properly, check open door indicator light. See OPEN DOOR INDICATOR LIGHT .
Open Door Indicator Light
Open and close driver or passenger door while observing open door indicator light operation on instrument cluster. If indicator illuminates when doors are open and goes out when doors are closed, indicator light is operating properly and DTCs can be retrieved. See RETRIEVING DIAGNOSTIC TROUBLE CODES . If indicator light does not illuminate when doors are opened, repair open door indicator light. See INSTRUMENT PANELS - RX300 article.
Open Door Indicator Light Method
Multiplex self-diagnostic system open door indicator light DTCs are retrieved through Data Link Connector 1 (DLC1). DLC1 is located in engine compartment, near ECM. Connect a jumper wire between DLC1 terminals E1 and Tc. (Scheme 2) Turn ignition on. DTCs are displayed as flashes of open door indicator light located on instrument cluster. Open door indicator light DTCs are displayed as 2-digit numbers. Observe indicator light, paying careful attention to length of pauses, in order to read DTCs correctly. (Scheme 3) See MULTIPLEX DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS table. If DTC(s) is present, perform appropriate test. See DIAGNOSTIC TESTS. After checking for DTCs, disconnect jumper wire and turn ignition off.
