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SRC-128 < DTC/CIRCUIT DIAGNOSIS > B1138, B1139, B1140, B1141, B1142, B1143 DIAGNOSIS SENSOR UNIT B1138, B1139, B1140, B1141, B1142, B1143 DIAGNOSIS SENSOR UNIT DTC Logic INFOID:0000000006220068 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. CHECK SELF-DIAG RESULT With CONSULT-III 1. Turn ignition switch ON. 2. Perform “Self Diagnostic Result” mode of “AIR BAG” using CONSULT-III. Without CONSULT-III 1. Turn ignition switch ON. 2. Check the air bag warning lamp status. Refer to SRC-14, "On Board Diagnosis Function" NOTE: Is malfunctioning part detected? YES >> Refer to SRC-128, "Diagnosis Procedure" NO >> INSPECTION END Diagnosis Procedure INFOID:0000000006220069 WARNING: • Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait at least 3 minutes or more. (To discharge backup capacitor.) • Never use unspecified tester or other measuring device. 1. CHECK HARNESS CONNECTOR Check the harness connector. Is the inspection result normal? YES >> GO TO 2. NO >> Replace harness connectors. 2. CHECK WIRING HARNESS Check the wiring harness externals. Is the inspection result normal? YES >> GO TO 3. NO >> Replace wiring harness. 3. REPLACE AIR BAG DIAGNOSIS SENSOR UNIT 1. Replace air bag diagnosis sensor unit. Refer to SR-26, "Removal and Installation" 2. Perform DTC confirmation procedure. Refer to Is DTC detected? YES >> GO TO 1. NO >> INSPECTION END DTC Display contents of CONSULT-III DTC detecting condition Possible cause B1138 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning Malfunction in air bag diagnosis sensor unit |