DTC B14B2: Lost Communication with Front Panel LIN [10/2014 - ]: Procedure

1. Disconnect the D44 air conditioning control assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D44-1 (B) - Body ground	Power switch off	11 to 14 V
   D44-9 (IG+) - Body ground	Power switch off	Below 1 V
   D44-9 (IG+) - Body ground	Power switch on (IG)	11 to 14 V
   D44-2 (ACC) - Body ground	Power switch off	Below 1 V
   D44-2 (ACC) - Body ground	Power switch on (ACC)	11 to 14 V

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D44-16 (GND) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the D62 air conditioning amplifier assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D44-3 (LIN1) - D62-37 (LIN1)	Always	Below 1 Ω
   D44-3 (LIN1) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Replace the air conditioning control assembly (Refer to REMOVAL [10/2014 - ] ).

   HINT: 

   Since the air conditioning control assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning control assembly with a new or known good one and check that the condition returns to normal.

   OK

   Air conditioning control assembly operation returns to normal.

   Result

   Result	Proceed to
   OK	A
   NG (When troubleshooting according to Problem Symptoms Table)	B
   NG (When troubleshooting according to the DTC)	C

Result: 

A 

END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE) 

Result: 

B 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] or PROBLEM SYMPTOMS TABLE [10/2015 - ] )

Result: 

C 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )