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Home › Lexus › 2003 › IS 300 Base, Standard › Repair and Diagnosis › Accessories & Equipment › Communication Devices › Body Control System › Circuit Tests › Taillight Relay Circuit › Inspection Procedure

Inspection Procedure

  1. Check the taillight relay. See RELAYS under COMPONENT TESTS in STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. If the results are OK, go to the next step. If the results are not OK, replace the taillight relay.
  2. Check the wiring harness and connector between the taillight relay and body ECU, battery and taillight relay. See WIRING DIAGRAMS . If the results are OK, the circuit is OK. Further diagnosis is needed. If the results are not OK, repair or replace the wiring harness or connector.
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