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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Heater & Air Conditioning Control System (DTC/Circuit Diagnosis) (Except Hybrid)) >> DTC/Circuit Diagnosis >> DTC B257B, B257C: Ambient Sensor >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to DTC LOGIC .
  • If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. DTC LOGIC .
DTC Items
(CONSULT screen terms)		 DTC detection condition Possible cause
B257B AMBIENT SENSOR The ambient sensor recognition temperature is too high.
  • Ambient sensor
  • A/C auto amp.
  • Harness or connectors

    (The sensor circuit is open or shorted.)
B257C The ambient sensor recognition temperature is too low.
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