A/C Switch Assembly Signal Circuit

A/C SWITCH ASSEMBLY SIGNAL CIRCUIT

Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" Automatic Air Conditioning.

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 HAC55, "DTC Logic" or "DTC Logic" Climate Control Control Unit (CAN).
Is any DTC No. displayed?
YES- Perform diagnosis for the applicable DTC. Refer to "DTC Index" Testing and Inspection.
NO- GO TO 2.

2. CHECK TX (A/C SWITCH ASSEMBLY --> A/C AUTO AMP.) CIRCUIT CONTINUITY

1.Turn ignition switch OFF.
2.Disconnect the A/C switch assembly and the A/C auto amp. connectors.
3.Check continuity between A/C switch assembly harness connector M79 terminal 10 and A/C auto amp.
harness connector M152 terminal 24.





4.Check continuity between A/C switch assembly harness connector M79 terminal 10 and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair harness or connector.


3. CHECK RX (A/C AUTO AMP. --> A/C SWITCH ASSEMBLY) CIRCUIT CONTINUITY

1.Check continuity between A/C switch assembly harness connector M79 terminal 9 and A/C auto amp.
harness connector M152 terminal 4.





2.Check continuity between A/C switch assembly harness connector M79 terminal 9 and ground.





Is the inspection result normal?
YES- Perform trouble diagnosis for the A/C switch assembly. Refer to "A/C SWITCH ASSEMBLY : Diagnosis Procedure" Diagnosis Procedure.
NO- Repair harness or connector.