DESCRIPTION
The seat heater switch (air conditioning control assembly) communicates with the air conditioning amplifier assembly via LIN communication.
If the LIN communication system is malfunctioning, the air conditioning amplifier assembly will not operate even if the seat heater switch (air conditioning control assembly) is operated.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
B14B5 |
Lost Communication with Front Seat Temperature Adjustment Switch LIN |
Lost communication with the seat heater switch (air conditioning control assembly) |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs.
Click here
|
2. |
CHECK FOR DTC |
(a) Check for DTCs.
Click here
OK:
DTC B14B5 is not output.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
3. |
CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) - BODY GROUND) |
(a) Disconnect the seat heater switch (air conditioning control assembly) connector. |
|
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F61-10 (IG+) - Body ground |
Ignition switch ON |
11 to 14 V |
Ignition switch off |
Below 1 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F61-16 (GND) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY)) |
(a) Disconnect the F61 seat heater switch (air conditioning control assembly) connector.
(b) Disconnect the F72*1 or F139*2 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for TMMT Made
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F61-2 (LIN1) - F72-3 (LIN1) |
Always |
Below 1 Ω |
F61-2 (LIN1) or F72-3 (LIN1) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F61-2 (LIN1) - F139-14 (LIN1) |
Always |
Below 1 Ω |
F61-2 (LIN1) or F139-14 (LIN1) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
REPLACE SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) |
(a) Temporarily replace the seat heater switch (air conditioning control assembly) with a new or known good one.
Click here
|
6. |
CLEAR DTC |
(a) Clear the DTCs.
Click here
OK:
DTC B14B5 is not output.
|
7. |
CHECK FOR DTC |
(a) Check for DTCs.
Click here
OK:
DTC B14B5 is not output.
OK | ![]() |
END (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE) |
NG | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
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