HVAC DTC Troubleshooting: 4 | 2012-2016 CR-V RM1/RM4,RE5/RE6 HONDA CR-V Service Manual

1.

Problem verification:

Problem verification

?1.	Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?2.	Do the Self-Diagnostic Function with the HVAC control unit.

?3.	Check for DTCs.

Is DTC 4 indicated?


	YES

Go to step 2.


	NO

Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.?

2.

Determine possible failure area (MODE-P line, others):

Determine possible failure area (MODE-P line, others)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Disconnect the following connector.

Mode control motor 7P connector

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Mode control motor 7P connector: disconnected
Test point 1	Mode control motor 7P connector No. 2
Test point 2	Body ground

Is there about 5 V?


	YES

The MODE-P wire is OK. Go to step 3.


	NO

Go to step 4.

3.

Open wire check (SENSOR COM/SENS-COM line):

Open wire check (SENSOR COM/SENS-COM line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Mode control motor 7P connector: disconnected
Test point 1	Mode control motor 7P connector No. 2
Test point 2	Mode control motor 7P connector No. 3

Is there about 5 V?


	YES

The SENSOR COM/SENS-COM wire is OK. Replace the mode control motor.?


	NO

Repair an open in the wire between the HVAC control unit and the mode control motor.?

4.

Open wire check (MODE-P line):

Open wire check (MODE-P line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Mode control motor 7P connector: disconnected
Test point 1	HVAC control unit 32P connector No. 23
Test point 2	Body ground

Is there about 5 V?


	YES

Repair an open in the wire between the HVAC control unit and the mode control motor.?


	NO

Replace the HVAC control unit.?