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DIAGNOSIS TSB Revision KEYLESS OPERATION SYSTEM (KOS) 42B-39 STEP 4. Recheck for diagnostic trouble code. position. (2) Check if DTC is set. YES : Replace KOS-ECU and register the ID codes. (Refer to .) After registering the ID codes, go to Step 6. NO : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to use Troubleshooting/inspection Service Points − How to Cope with Intermittent Malfunction STEP 5. Recheck for diagnostic trouble code. position. (2) Check if DTC is set. YES : Replace the engine control module and record the VIN (Refer to GROUP 00 - How To Perform Vehicle ). Then go to Step 6. NO : The procedure is complete. STEP 6. Recheck for diagnostic trouble code. position. (2) Check if DTC is set. YES : Replace the ETACS-ECU. DTC B1761: VIN code not programmed CAUTION • When DTC No. B1761 is set, be sure to diag- nose the CAN bus line. • When replacing the ECU, always check that the communication circuit is normal. . DTC SET CONDITION KOS-ECU sets DTC B1761 when no VIN is recorded . TECHNICAL DESCRIPTION (COMMENT) KOS-ECU determines that the abnormality is present . TROUBLESHOOTING HINTS • VIN not programmed • Malfunction of the KOS-ECU |