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HAC-36 < DTC/CIRCUIT DIAGNOSIS > [WITH COLOR DISPLAY] B2578, B2579 IN-VEHICLE SENSOR NOTE: If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to . DTC CONFIRMATION PROCEDURE 1. CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT 1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 2. Check if any DTC No. is displayed in the self-diagnosis results. NOTE: If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to . Is DTC No.“B2578” or “B2579” displayed? YES >> Perform trouble diagnosis for the in-vehicle sensor. Refer to NO >> Inspection End. Diagnosis Procedure INFOID:0000000010050976 Regarding Wiring Diagram information, refer to HAC-67, "Wiring Diagram - With Color Display" . 1. CHECK IN-VEHICLE SENSOR POWER SUPPLY 1. Disconnect in-vehicle sensor connector. 2. Turn ignition switch ON. 3. Check voltage between in-vehicle sensor harness connector M34 terminal 1 and ground. Is the inspection result normal? YES >> GO TO 2. NO >> GO TO 4. 2. CHECK CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP. 1. Turn ignition switch OFF. 2. Disconnect A/C auto amp. connector. 3. Check continuity between in-vehicle sensor harness connector M34 (A) terminal 2 and A/C auto amp. harness connector M37 (B) terminal 37. Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connector. 3. CHECK IN-VEHICLE SENSOR Check in-vehicle sensor. Refer to HAC-37, "Component Inspection" DTC Items (CONSULT screen terms) Diagnostic item is detected when... Possible cause B2578 IN-CAR SENSOR (OUT OF RANGE Detected temperature at in-vehicle °C (131°F) or more • In-vehicle sensor (In-vehicle sensor circuit is open, B2579 IN-CAR SENSOR (OUT OF RANGE Detected temperature at in-vehicle °C (-22°F) or less 1 - Ground : Approx. 5V AWIIA1136ZZ 2 - 37 : Continuity should exist. AWIIA1137ZZ |