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DTC B1262: A/C Control Assembly To Body Ecu Communication

NOTE: Code B1262 sets when no communication is received from A/C control assembly for more than 10 seconds. Problem is in A/C control assembly or wiring harness.
  1. If vehicle is not equipped with navigation system, go to next step. If vehicle is equipped with navigation system, go to step  3.
  2. Disconnect 31-pin A/C ECU connector. See Figure. Disconnect 35-pin ECM connector. Figure. Disconnect center cluster integration control panel 10-pin connector. Check continuity of Gray/Black wire between A/C ECU 31-pin connector terminal No. 2 and ECM 35-pin connector terminal No. 20. Check continuity of Gray/Black wire between A/C ECU 31-pin connector terminal 4 and 10-pin center cluster integration control panel connector terminal No. 3. If continuity does not exist in all measurements, repair or replace wiring harness. See WIRING DIAGRAMS . If continuity exists in all measurements, replace A/C control assembly.
  3. Disconnect 31-pin A/C ECU connector. See Figure. Disconnect 35-pin ECM connector.Figure. Disconnect 22-pin body ECU connector. See Figure. Check continuity of Gray/Black wire between A/C ECU 31-pin connector terminal No. 2 and ECM 35-pin connector terminal No. 20. Check continuity of Gray/Black wire between A/C ECU 31-pin connector terminal No. 4 and body ECU 22-pin connector terminal No. 5. If continuity does not exist in all measurements, repair or replace wiring harness. See WIRING DIAGRAMS . If continuity exists in all measurements, replace A/C control assembly.
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