Toyota Camry (XV70): Lost Communication with Front Panel LIN (B14B2)
DESCRIPTION
The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication.
If a malfunction occurs in the LIN communication system, the air conditioning amplifier assembly will 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 sec. 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
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PROCEDURE
| 1. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - IG POWER SOURCE) |
(a) Disconnect the K26 air conditioning control assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K26-2 (IG+) - Body ground |
Ignition switch ON | 11 to 14 V |
|
K26-2 (IG+) - Body ground |
Ignition switch off | Below 1 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K26-6 (GND) - Body ground |
Always | Below 1 ? |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the K54 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 |
|---|---|---|
|
K26-9 (LIN1) - K54-14 (LIN1) |
Always | Below 1 ? |
|
K26-9 (LIN1) or K54-14 (LIN1) - Other terminals and body ground |
Always | 10 k? or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY |
.png)
(a) Connect the K54 air conditioning amplifier assembly connector.
(b) Turn the ignition switch to ON.
(c) Using a Techstream, check the waveform.
OK:
Waveform is similar to that shown in the illustration.
|
Item | Content |
|---|---|
|
Terminal No. | K54-14 (LIN1) - Body ground |
|
Tool Setting | 2 V/DIV., 20 ms./DIV. |
|
Condition | Ignition switch ON |
| NG | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
.gif)
|
| 5. |
INSPECT AIR CONDITIONING CONTROL ASSEMBLY |
.png)
(a) Connect the K26 air conditioning control assembly connector.
(b) Turn the ignition switch to ON.
(c) Using a Techstream, check the waveform.
OK:
Waveform is similar to that shown in the illustration.
|
Item | Content |
|---|---|
|
Terminal No. | K26-9 (LIN1) - Body ground |
|
Tool Setting | 2 V/DIV., 20 ms./DIV. |
|
Condition | Ignition switch ON |
| OK | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
| NG | | REPLACE AIR CONDITIONING CONTROL ASSEMBLY
|
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