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HAC-136 < DTC/CIRCUIT DIAGNOSIS > [WITH MONOCHROME DISPLAY] B257B, B257C AMBIENT SENSOR 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 or . • If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [-30 °C (-22°F)] and adjusts the temperature control warmer. Is DTC No.“B257B” or “B257C” displayed? YES >> Perform trouble diagnosis for the ambient sensor. Refer to HAC-136, "Diagnosis Procedure" NO >> Inspection End. Diagnosis Procedure INFOID:0000000010051135 Regarding Wiring Diagram information, refer to HAC-173, "Wiring Diagram - With Monochrome Display" 1. CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND 1. Disconnect ambient sensor connector. 2. Turn ignition switch ON. 3. Check voltage between ambient sensor harness connector E211 terminal 1 and ground. Is the inspection result normal? YES >> GO TO 2. NO >> GO TO 4. 2. CHECK CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP. 1. Turn ignition switch OFF. 2. Disconnect A/C auto amp. connector. 3. Check continuity between ambient sensor harness connector E211 (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 AMBIENT SENSOR Check ambient sensor. Refer to HAC-137, "Component Inspection" . Is the inspection result normal? YES >> Replace A/C auto amp. Refer to HAC-203, "Removal and Installation" . NO >> Replace ambient sensor. Refer to HAC-204, "Removal and Installation" 4. CHECK CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP. 1 - Ground : Approx. 5V AWIIA1133ZZ 2 - 37 : Continuity should exist. AWIIA1134ZZ |