B277B

B2777, B2779, B277B PTC ELEMENTS HEATER

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1.Turn power switch OFF.
2.Set the vehicle to READY.
3.Select "Self Diagnostic Result" mode of "HVAC" using CONSULT.
4.Check DTC.
Is DTC detected?
YES- Refer to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK PTC ELEMENTS HEATER COMMUNICATION LINE FOR OPEN

1.Turn power switch OFF.
2.Disconnect PTC elements heater and A/C auto amp. connector.
3.Check continuity between PTC elements heater harness connector and A/C auto amp harness connector.





Is the inspection result normal?
YES- GO TO 2.
NO- Repair harness or connector.

2. CHECK PTC ELEMENTS HEATER COMMUNICATION LINE FOR SHORT

Check continuity between PTC elements heater harness connector and ground.





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

3. CHECK A/C AUTO AMP.

With CONSULT
1.Turn power switch ON.
2.Using CONSULT, perform "HVAC TEST" on "ACTIVE TEST" of "HVAC". Refer to "CONSULT Function" CONSULT Function.
3.Check that the PTC elements heater operates normally.
Is the inspection result normal?
YES- GO TO 4.
NO- Replace A/C control (A/C auto amp.). (Refer to "Removal and Installation" Service and Repair). Then GO
TO 4.

4. PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC confirmation procedure. Refer to "DTC Logic" .
Is DTC B2777, B2779 or B277B detected?
YES- Replace PTC elements heater. Refer to "Removal and Installation" Removal And Installation.
NO- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.