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Test No. 5: Driver's Door Key Lock & Unlock Switch Circuit

NOTE: If LEXUS scan tool is available, start test from step  1. If this scan tool is not available, start test from step  2.
  1. Using scan tool, check for DTC B1222. If DTC B1222 is retrieved, go to next step. If DTC B1222 is not retrieved, see MULTIPLEX CONTROL SYSTEMS - GS300 & GS430 article.
  2. Check driver's door key lock and unlock switch. See DOOR KEY LOCK & UNLOCK SWITCH  under COMPONENT TESTS. Replace switch as necessary. Retest system operation. If switch is okay, go to next step.
  3. Check circuits for faults between driver's door key lock and unlock switch and driver's door ECU. See WIRING DIAGRAMS . Repair or replace as necessary. If circuits are okay, perform TEST NO. 26: PASSENGER'S DOOR KEY LOCK & UNLOCK SWITCH CIRCUIT .
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