Toyota CH-R Service Manual: Lost Communication with Front Panel LIN (B14B2)
DESCRIPTION
The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication.
If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate even if the air conditioning control assembly is operated.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B14B2 |
Lost Communication with Front Panel LIN |
Lost communication with air conditioning control assembly |
|
Memorized (10 seconds or more)* |
- *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - POWER SOURCE) |
|
(a) Disconnect the air conditioning control assembly connector. |
|
(b) Measure the voltage 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 |
|
F61-10 (IG+) - Body ground |
Ignition switch off |
Below 1 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
F61-16 (GND) -Body ground |
Always |
Below 1 Ω |
| NG | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
|
2. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY) |
(a) Disconnect the F72 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
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 |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY |
(a) Reconnect the F72 air conditioning amplifier assembly connector.
(b) Turn the ignition switch ON.
(c) Connect an oscilloscope to terminals F72-3 (LIN1) and F72-29 (GND) of the air conditioning amplifier assembly and check the waveform.
OK:
Waveform is similar to that shown in the illustration.
|
Item |
Content |
|---|---|
|
Tool Setting |
2 V/DIV., 20 ms./DIV. |
|
Vehicle Condition |
Ignition switch ON |
|
*a |
Component with harness connected (Air Conditioning Amplifier Assembly) |
- |
- |
| NG | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
|
4. |
INSPECT AIR CONDITIONING CONTROL ASSEMBLY |
(a) Reconnect the F61 air conditioning control assembly connector.
(b) Turn the ignition switch ON.
(c) Connect an oscilloscope to terminals F61-2 (LIN1) and F61-16 (GND) of the air conditioning control assembly and check the waveform.
OK:
Waveform is similar to that shown in the illustration.
|
Item |
Content |
|---|---|
|
Tool Setting |
2 V/DIV., 20 ms./DIV. |
|
Vehicle Condition |
Ignition switch ON |
|
*a |
Component with harness connected (Air Conditioning Control Assembly) |
- |
- |
| OK | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| NG | |
REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
Lost Communication with ECM (U0100-U0142,U0155)
DESCRIPTION
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
Memory
U0100
Lost Communication with ECM
...
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DESCRIPTION
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CAUTION / NOTICE / HINT
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Toyota C-HR (AX20) 2023-2026 Owner's Manual
Toyota CH-R Owners Manual
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Toyota CH-R Service Manual
- Introduction
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